New species of decapod crustaceans from the Dutch West Indies

Vol. XXVIII, pp. 117-120

May

^{27, 1915}

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

.

Lu

V

NEW ^{SPECIES OF} DECAPOD CRUSTACEANS FROM THE DUTCH WEST INDIES.

BY MARY

^J.

RATHBUN.

Some time ago

^I

prepared an account

of

the

stalk-eyed crus- taceans collected

by ^Dr.

^J.

Boeke

ⁱⁿ

1905

in

the Dutch West

Indies.

As the

publication^ofthat report

has been unavoidably

delayed,

Doctor Boeke _{has given} me permission

^to

publish

separately descriptions^of the

new

species.

The _{type specimens}

are in the

Leiden Museum.

Fajhly PENEID^.

Metapeneeus

mobilispinis sp. nov.

Type.

—

_{Male, from}

_Cave Round

_{Bay, Saba,}inabout 4 fathoms, stony bottom; August ^26.

Measurements.

—

_{Male, length} from _{tip of} rostrum to tip of telson 32.4

mm.,

length^ofcarapaceincludingrostrum 9.5

mm.

Description.

—

_Carapace short-pubescent ⁱⁿ front of cervical suture.

Rostrum

_{ascending,short,}not reaching

end

ofeyes; deep,lowerlimbas wideasupper, which isconvex

and armed

with5-7curvedteeth. Post- rostral crestcontinuedtomiddleofcarapace

and armed

atanteriorfourth ofcarapace

and

atposteriorendof rostrum witha_straight, slender _spine.

Antero-lateral angles ^of carapace rounded. Postocular tooth small, acute. Postantennular spine long

and

_slender, postantennular groove deep, meeting ^{the cervical} groove.

A

very short, oljlique

and

_deeply impressed groove oneither side of rostrum atanterior border _{of gastric} region. Branchial_region bordered_anteriorly

by

^{a sinuous} groove(part of the cervical groove), and _superiorly

by

^a groove which ^isverydeep below the hepatic spine but becomes faint posteriorly

and

_disappears altogethertowards thehind _regionofthe carapace.

Fifth

and

sixthabdominaltergasharply carinated^atmiddle; ^fifthseg-

ment

alittle

more

thanhalf aslong ^{as sixth,}whichisalittlelongerthan telson. Telson consideraljly shorter than inner caudal

swimmeret and

hastwoslendermarginalspines (the posterior the longer)

on

either side

21—Proc. Biol.Soc.Wash.,Vol.XXVIII, ^{1915. (HT)}

118

Proceedings of the Biological Society of

Washington.

near the middle; extremity^{cut into} three slender _spines, middle one longest,widening;^atitsmiddle, ^lateralones_veryslender, with anarticu- latingextremity.

Eyesvery large,not reaching

end

ofantennularscale. Outerorupper antennular flagellum shorterthan inner

which

isshorterthan_peduncle.

Thirdmaxillipeds reach ^to middleof last article of antennal _peduncle;

dactylus suboval. Terminal _{joints of} fourth

and

fifth pairs of thoracic legslanceolate; ^fifth pairextend toendof firstthirdof antennalscale.

The

andricum increases in width _distally, is

much

thickened at the middle, very thin ⁱⁿ terminal thirdwhere ^it forms three lobes on each side, the distal one_{round, the} next half as wide, the proximal one ^fili- form^.

Relationships.

— M.

goodei (Smith) ^{of the}

West

Indian _region

and M.

pubescens (Stimpson) from ^St.

Thomas,

which

may

^be identical, both have_{a longer}rostrum than our _{species, a spine} at antero-inferior angle ofcarapace

and

theabdominalcarina begins

on

thesecond segment.

Family XANTHID^.

Panopeus

^boekei sp.nov.

Type.

—

_{Male, from}

Tumble-Down-Dick

_Bay, St.Eustatius,15fathoms, stony bottom; September^17.

Measurements.

—

_{Male, length} 8.6

mm.,

^{width 13}

mm.,

fronto-orbital width9.4

mm.,

^{front 4.4}

mm.

Description.

—

_Carapacedeeply areolatedⁱⁿ anterior two-thirds, ^areoles crossed bygranulatedrugae; surface _finelygranulated

and

coveredwith scattered hairsofuneven _length; carapace convex ⁱⁿ a longitudinal ^as well as in a transverse _direction,save for the four antero-lateral teeth whicharethickened

and

_upturned; teethwellseparated^{; first}toothshort

and

_broad, convex; second tooth

more

_prominent

and

equally wide, posterior

margin

^{convex, anterior}straightor_slightlyconcave, tipblunt;

third tooth similar in shape,but _longer, narrower

and

thicker; fourth tooth narrow, triangular, acute, situated at widest part ^of carapace.

Front with _{a deep,} narrow,

median

emargination, forming ^a rounded lobe

on

each_{side, at}theouterendofwhichthereisa very small rounded lobe. Acrossthe front runs a transverse raised line fringed with long hair. Preorbital angleprominent, blunt; lobe between the two upper fissures of the orbit nearly transverse, slightly convex; lower margin withablunt inner tooth; aV-shaped notch below^outerangle.

Largercheliped

much more

massive than smaller.

Merus

short

and

high, withagroovesubparallel^{to distal}margin

and

behinditaflattened toothon upper

margin

^; carpus rugose, with a^distal furrow

and

asmall inner tooth;

manus

granulate, granules reticulating, upper ^surface with ashallow groove; fingers with rowsof punctse, a groove on^outside

and

inside of

immovable

finger,

and

agroove nearupper edge ^ofouter surface ofdactylus; prehensileedgesirregularlytoothed, oneof the _larger teeth at base^ofdactyl of largerchela; fingers in thischelagaping moderately;

Rathhun — _New

_{Species of}

_Decapod

Crustaceans.

119

larjijer

thumb

slightly deflexed, smalleroneconsiderably^so; fingers light brown, ^colornotextended on palm.

Ambulatory

legs hairy,slenderandrather_long,secondone_longerthan carapace ^iswide.

Surface of maxillipeds

and

sternum finely granulate.

Abdomen

of male _reachingto coxa? of-last legs; third, fourth

and

fifth segments coalesced,althoughshort depressions indicate suture^lines; sixthsegment about twiceaswide_{as long,} widening distally, seventh segment broadly triangular.

Relationships.

—

This _{species in} its areolation

and

_prominent lateral teeth resembles P. bermudensis Benedict

and Rathbun*

in

which

thefirst lateraltoothislarger

and

thelast tooth smaller: the lobes of the front are not so rounded nor so deeply separated^; tooth _{larger at} base of dactylusof largechela; male

abdomen

withfusedsegment widerat base, penultimate

and

last segmentslonger.

•Proc.U.S.Nat. Mu3.,vol. 14, 1891, p. 376. pi. 20,fig. 2.pi.24, figs. 14, 15.