Proceedings of the Biological Society of Washington.

VOL. XIV, PP. 179-180

SEPTEMBER

25, 1901

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

TWO NEW SUBTERRANEAN CRUSTACEANS FROM THE UNITED STATES.

BY W.

P.

HAY.

During

^{a recent visit to the}

Mammoth Cave

of

Kentucky, and Nickajack Cave

ⁱⁿ Tennessee, ^{the writer}

was

fortunate

enough

^{to obtain}

from

the former twelve specimens ^{of a small} eyeless shrimp,

and from

the latterabout as

many

specimens^of an Isopod crustacean belonging ^{to the}

genus

^Ccecidotea

Pack

ard.

The _shrimp

on examination proves ^to be so distinct

from

all the Palc&monidcK ^hitherto described as to necessitate the erec tion of a

new

_genus.

The

_Isopod, as it

came from

the type locality of Ccecidotea nickajackensis

Packard was

at first

thought ^to be that _species, but a careful comparison with Dr.

Packard's description

and

_figures

and with

_specimens of C.

nickajackensis

from

wellsat Metcalf, Georgia,

shows

that it is distinct.

The new _genus

and the

two new

_species

may

be described as follows:

Palaemonias _gen. nov.

Similar toPalccmonetes in form and in the absence of a mandibular palpus. Gillsfourandarudiment on each^side. Rostrum_long,slender

36 BIOL. Soc. WASH. VOL. XIV,^1901. (179)

180

Hay New

Subterranean Crustaceans.

and serrate above and below. Antero-lateralmargin^of carapace with two_spines. Firsttwo_{pairs of} ambulatory appendagessub-equal In^size andsimilarin form; chelate and with _large bunches of pectinate ^bris tles on the distal extremities of the _fingers.

The

articulation of the handwith_{the carpal}segment ^isata point on the lower surface of the hand some distance from the proximal end; and the prominent knob- likeextremity fits,

when

thelimbis fully extended, into ^a broad sinus formed by^themargin^{of a}plate-likeexpansion^of the carpus.

Palammonias ganteri sp. nov.

Carapace about one ^{third the} total length, very thin and delicate.

Rostrum as long ^as the antennal _scale,its upper surface with about fourteen smallteeth, lowersurface withtwoorthree teeth. Eye^stalks rudimentaryandwithout pigment. Antenmilesbi-liagellate.

Antenme

longerthan_{the body.} Colorinalcohol white; inlifenearly transparent.

Lengthabout one inchandaquarter.

Named

for Mr. H.C. Ganter, themanager^{of the cave,}

who

_through

hisdeep^{interestinthescientific} study^{of its}faunaand ^flora wasled to afford

me

exceptionalfacilities formaking

my

investigations.

Caecidotea richardsonae _sp. nov.

Body^slenderbut broaderthan ineither C.xtygia or C. nicfccyacfcenxi*.

Margins ^of the head, body segments and telson _hairy. Antennules as long ^as the peduncle ^of the antennae, the flagellum with fifteen seg ments. Antennas_longand_veryslender, the liagellum with about_sixty- five segments. Legs

much

_longer than in the other species of ^this genus, Uropods^of nearlyuniform diameter throughout, slender, about onehalf aslong^asthebody andthickly besetwith shortstiff hairs.

Colorinlifeandin alcohol white.

Named

forMiss Harriet Richardson, whose _{papers on} NorthAmeri can_Isopoclsarewell known.