40 AMERICAN CORBICULAD^

S. dtMiijluiu

8. Spliaerilllll.

dentaf uiu,

Haldemax.

—

^Animalnot observed.

Shell large, ventricose, somewhat equilateral, inferiorand anterior margins rounded; posterior somewhatangular;beakslarge,well-rounded,dis- tant, not very prominent^; hinge-margin nearly straight; cardinal teeth single, distinct^; lateral teethnot prominent^;sulcations slight;epidermis olive-green,withadark narrowzoneatsomedis- tance above the basal margin.

Long.0.50; Lat. 0.40; Diam. 0.37 inches.

Hah. North America,in Oregon. (Cabinet of the

Academy

ofNaturalSciences ofPhiladelphia.) Cyclas dentata, Haldemax,Proc.Acad. Nat.Sci. Phila.I, 1841, 100.

The young

shell is

elongated

and more

heavily siilcated

than

the adult; the beaks are less large

and

less tumid. Thisis

a

well

marked

species,

compared

with S. patella, Gould,

from

the

same

sectionof the country, ^it isfoundtobelarger,

ventricose, the beaks are

inflated,

and

the color of the epidermis

isdifferent.

The

only

two

specimens I

have

seen ofthe S.

dentatum were

those

from which Mr. Haldeman

described the species,

an

adult

and

young

^one,

which

was

kind

enough

tolend

me

for study

;

they are

now

deposited inthe collection of the

Academy

of !Xatu- ral Sciences ofPhiladelphia.

Fig. 33.

S. fabalis.

Spliaerilim

falJalis,^Prime.

—

^Animal, ^syphons^crimson.

Shell transversely oval, compressed, nearly equilateral^; anterior and basalmargins rounded; posteriormargin slightlyabrupt

;

beaks notfull,very

much

^depressed;sulcationsmoderately heavy,veryregular, quite distinct; epidermis light-green, it is, however,sometimes quite dark; inthe young itis oftenstrawcolor; valvesslight,interior blue; hinge-margin veryslightly curved; cardinal teeth small, assuming the shapeoftheletter

V

reversed;lateralteeth slight;an- teriortooth somewhat more elevated, both placed very nearlyon aline withthe cardinalteeth.

Long.0.56; Lat. 0.43; Diam.0.25 inches.

Ilah. North America,intheStates of

New

York,Ohio,Illinois,Tennes- see,Georgia, Virginia,Michigan and Pennsylvania. (Cabinetscf Smith- sonianInstitution,JayandPrime.)

Cijclasfabalis,Prime,Bost. Proc. IV, 1851, 159.

Ci/clascastanea. Prime,loc. suVj. cit. IV, 1851, 160.

Cyclassulculosa, DeCuakpextieb, MSS. 1851.

SPHtERIUM. 41 Thisisa verydistinct species ; I

know

no

otherto

which

bears

any

resemblance; it is remarlvable for ^its compressed ap- pearance,

and

for the depression of its beaks. Tliough pretty widelydistributed,it does not

seem

to be found

anywhere

much

abundance.

The

êpidermis^{of the} ^shell îsât^times so entirely stained with a darkish substance, that ît îs with difficultythat its color can

be

detected.

1&. SplaSeriiUM occadeiitale, Prime.—

^Animalnot observed.

Shell oval,small, pellucid, fragile, e^iuilateral,margins

rounded^;^valves^slight,^ratherconvex;beaksfull, round- ^^S- ^4.

ed,not

much

raised; sulcationsvery^fine,hardlyvisible; „,,cr^.

epidermis horn color; cardinal teeth very diminutive; ,

lateral teethmore^distinct. |v _^

Long. 0.31; Lat. 0.25^; Diam.0.18 inches.

Hab. North America,in the States of

New

^{York, Ver-} s.occidentale.

mont,Ohio,Michigan, Wisconsin,in the HellGateRiver,

Washington ^Territory,and inCanada. (Cabinetsofthe

Academy

of Na- tural Sciences of Philadelphia,SmithsonianInstitution,JayandPrime.)

Cyclasovalis (preoc), Prime,Bost. Proc. IV, 1852, 276.

Sphmriumôvale,^Stimpson,Âdams,^rec. ^gen. ÎI,^{185^, 450.}

Sphceriumoccidentale,Prime, Proc. Ac. N. S. Phila. 1860, 295.

Thisspecies isremarkable forits completelyoval shape,

which

renders it quite distinct

from

âllôthers. Îtîs ^{found not}

uncom-

inonly.

Compared

^with ^S.

partumeium, under which name

has attimes

been

sent tome, it is

much

smaller, the

margins

are

rounded,

and

the beaks are not so

much

raised.

11.

SpliiBrilini

MOUile, ^Gould.—

^Animal^not ^observed.

Shell rhombic-ovate, inequilateral, moderately compressed; anterior margintruncated, posteriormore distended, basal curved;

beaks rounded,^inclined towards the front, slightlytumid, ^^S- ^^^

separate at apex; sulcations coarse; epidermis delicate, ^..^-^^

light brown; valves strong, interior white; hinge-margin

nearly straight, moderately broad; ^cardinal ^teeth ^single, ^j^^^^

distinct;lateral teethmoderately developed. _^ ^^^^.^

Long.0.50; Lat. 0.37; Diam.0.25 inches.

Hah. North America,^at San Pedro, in the State of California. (Cabi- netsofGould, SmithsonianInstitutionandPrime.)

Cyclas nohiUs,Gould,Bost. Proc.V,1855, 229. Atlas of U.S.Exp.

Expedit. pi. 36.

42 AMERICAN CORBICrLAD^.

Compared

with S.

sulcatum

it is slighter, less suleated,

more compressed and

less tumid. Thisspecies is rare, the only speci-

mens

have

seen

were

kindlypresentedto

me by

Dr. Gould.

12.

Spliaeriiiin

patella,

^Gould.

—

^Animalnotobserved.

Shellrounded oval, lenticular, compressed, equilateral; marginsgene- rally rounded; beaks central, small, hardly raised; valves Fig. 36. slight, interior white; sulcations extremely fine; epidermis light,ofa yellowish-browncolor^;cardinalteethverydiminu-

tive,soplacedas toassumetheshapeoftheletter

V

reversed^• lateralteeth notprominent,elongated.

S- patella.

Loug_0,43; Lat. 0.31; Diam. 0.18 inches.

Hab. North America,in Oregon. (Cabinets ofGould,Smithsonian In- stitutionandPrime.)

Cy das^patella,^Gopld,Bost. Proc. Ill, 1850, 292. Atlas U. S. Exp.

Expedit. pi. 36.

This speciesispeculiar,

owing

to its

compressed

oval shape

and rounded

beaks;

compared

with S.

fiavum

^it ^is

^more

^oval,

^more

ecpiilateral,

and

its beaks are less tumid.

The

specimens in

my

cabinet

came from

Dr. Gould.

13. Spliaerium vermoiitamiiu,

^Prime.

—

Animalnotobserved.

Shellveryoblique,tumid,inequilateral,full; an- Fig. 37. _terior margin abrupt, posterior drawn out to an angle, basal slightlycurved; beaks large,full,prominent, placed very

much

towards the anterior, in which direction they are slightly inclined; sulcations coarse, moderately regular; epidermis light yjj green;ligament conspicuous; valves solid,interior

\._

^^ ^{^}

^{"^} ^ligbt^blue^; hinge-margin

much

curved,broad;cardinal teeth strong, representing the letter

V

:e- 5.vermontanum.

^^^.^^^^.j^^^^^j^^^^j^elongated. Strong.

Long. 0.56; Lat. 0.37; Diam.0.25 inches.

Hab. North ^America, ⁱⁿ Lakes Champlain and Memphremagog, Ver- mont. (CabinetsofPrime andSmithsbnian Institution.)

Sphserium vermontanum, Prime, Proc. Ac. N. S. Phil. 1861, 128.

Remarkable

for its very oblique

and tumid

shape,

and

for tlie

abruptness ofitsanteriormargin.

Compared

withS.

stamineum,

it is

more tumid and

lessheavily suleated; itisless elongated

and more tumid

than the S. striatinum. Quite rare. I have cevt:

seenbut a few specimens ofthis species,

which were

receivedfrom thelate Prof.

Adams,

Amherst.

SPH^RIUM. ₄₃ 14.

SiJliaeriism

emargiiiatiiin,

Pkime.

—

^Animalnot observed.

Shell triangular, nearlyequilateral, convex, tumid,

anteriorandposteriormarginsabrupt, posterior slightly ^ig- 38.

moredistended,basalmargincurved;valvessolid,in- /' teriorwhite;beaks veryfull,prominent, nearlycentral; ,

ligament distinct; sulcations regular, not heavy.; epidermis brown, withseveralnarrowtransverse zones of a darkcoloratregular intervals;hinge-margin curved;

cardinal teethsinale, quite distinct; lateral teethnot

, , . , " _S.emarginatum.

much

elongated, strong.

Long. 0.37; Lat. 0.37; Diam. 0.25 inches.

Hab. North America, in the region of Lake Superior. (Cabinets of Agassiz,Smithsonian InstitutionandPrime.)

Cyclus eniarginata, Pkijie, Bost. Proc. IV, 1851, 156.

The

triangular

and

very

tumid

form of this species is quite singular; ^it differs

from

vermontanum

iu being

tumid,

fuller, iu

having

larger beaks,

and

in being

much

less broadat thebase.

The young

shell is

elongated

and

lesstumid than the adult.

A

^rare ^species.

15. SpliaeriMlML

flaTUni, Pkime.—

Animalnotobserved.

Shell transversely rounded, compressed, equilateral, deli-

cate, margins generally rounded, the posterior a little dis- ^*'S- '^""

tended; beakscentral,notfull,moreorlessdepressed;valves .^ ^^r\

veryslight, interiorwhitish; sulcations prettydee]?,regular; i" ';d

epidermis light, of a greenish-yellow color; .cardinal teeth small, in the shape of the letter

V

^reversed; ^lateral ^teeth

elongated.

Long. 0.43^; Lat. 0.31; Diam. 0.18 inches.

Hah. North America,^atthe SaultSt.Marie,Lake Superior. (Cabinets of Agassiz,SmithsonianInstitution, JayandPrime.)

CycJas flava,Pkime,Bost. Proc. IV,1851, 155.

This isa very slight

and

delicate species, quite distinct

from any

others but S. patella, to

which

it bears

some

general resemblance

from

its shape; it is, however,

compressed, less high,

and

the exterior of the valves is verydifferent, as they are nearly

smooth

in Dr. Gould's ^shell.

Found

not unplentifnllyin the one locality.

16. Spliaerium

tuiuidlliii,

W.

Baird.

—

S. testaovato-trigonn, tumida, olivacea, confertetransversim concentriceforte costata; umboni- busprominentibus, neenonerosis;interne ccerulescente;margiueventrali rotundato.

Dalam dokumen Monograph of American Corbiculadae (Recent and fossil) (Halaman 52-56)

dentaf uiu,

—

Academy

The young

more

and more

than

and

a

marked

compared

from

same

more

more

and

The

two

have

dentatum were

from which Mr. Haldeman

an

and

young

which

was

enough

me

now

Academy

Spliaerilim

—

much

V

New

know

no

which

any

and

seem

anywhere

much

The

be

1&. SplaSeriiUM occadeiitale, Prime.—

much

New

Academy

which

from

uncom-

Compared

partumeium, under which name

been

much

margins

more

and

much

11.

MOUile, Gould.—

42 AMERICAN CORBICrLAD^.

Compared

sulcatum

more compressed and

mens

have

were

me by

12.

patella,

—

V

owing

compressed

and rounded

compared

fiavum

MOUile, ^Gould.—

^more

^more

^^ ^{^}

SPH^RIUM. ₄₃ 14.