288 
ZOOLOGICAL LITERATURE. 
of the peduncle of the superior antenuiB to the first articulus of the flagellimi; 
induce him to place it in the genus Dcxumine. 
Dexamine anisopus $ , which, from the great variation in the Ibrm of the 
second, tliird, and fourth pairs of legs on the right and left sides, he considers, 
since he has seen D. spiniventris of Costa, may probably belong to that 
species. 
Dexamine leptonyx $ resembles AmphUoe (Dexamine) tenuicornis of 
Ivatbke, but is distinguislinbio from it by a short brush of hair on the siicond 
joint of the peduncle of the inferior anteimye. 
Gatnmarus recurvus Prof. Grube states to resemble the subterranean genus 
Orangonyx suhterraneus of the ‘ British Sessile -eyed Crustacea/ but diflers 
from it in having j;he eye black and the gnathopoda alike and sliorter than 
the pereiopoda. The female of the genus Gammardla approxinifites so 
nearly in form to Cranyonyx, onl}^ having the eye coloured with black pig- 
ment, that we have little doubt of the near relationship of Prof. G rube’s 
Gammarus recurvus to Gammarella normani, which is probably the female of 
G. hrevicaudata. 
Under the name of Gammarus suhtcner Dr. Stimpson has described (Proc. 
Acad. Nat. Sci. Philad. 1804, p. 157) a small compressed species of delicate 
structure from Puget Sound. 
Iphimcdia mullispiniSf Prof. Grube (/. c. p. 202) says, resembles I. nodusa of 
Dana; but the description and figure show, we think, a closer approximation 
to I. ehlance, the dorsal carinal teeth being less strong (probably a sexual distinc- 
tion). I. multispinis was dredged in the Bay of Ci gale in the Isle ofLussin. 
? Kroyera haploclieleS) sp. n. ?, Grube, Insel laissin, p. 72, from Imssin. 
3Itera fusca, sp. n., Spence Bate, Proc. Zool. Soc. 1804, p. 007, from Esqui- 
malt Harbour, Viincouver’s Island. 
COROPIIID^. 
Amphilhde humeralis is a new littoral species from Puget Sound. Stimpson, 
Proc. Acad. Nat. Sc. Philad. 1804, p. 156. 
Colomastix is a new genus, which Prof. Grube (1. c. p. 200) states to 
closely resemble Cratippus of the ‘ British Sessile-eyed Crustacea.’ He defines 
it as follows; — Dereion (corpus) subteres, depressum, postice attenuatum, 
coxis humilibus. Antennce breves, fortes, flagellis maxime obsoletis vel iiullis ; 
superiores inferioribus vix loiigiores, ilagello secuiidario nullo. Siayonopoda 
iertia (pedes maxillares) exungues. Gnathopoda paris D“* tenuia, eximguia; 
2ti fortiora, subchelata. Dleopoda omnia bivamea, spiiiulis nullis ; ramo paris 
Otii exteriore neque uncinato neque uncinis armato. Telson simplex, lami- 
nare. — Colomastix pusilla $ (taf 4. f. 2). The difference, as shown by Prof. 
Grube, of this species from Cratippus tenuipes consists in the form of tlie first 
pair of gnathopoda, which in Colomastix terminate in several curved spines, 
whereas in Cratippus it is “ scarcely subchelate.” Even this distinction, as 
suggested by Prof Grube, may be only of sexual importance; and we think 
it insufficient to warrant the formation of a new genus. 
Icridium is a new genus, of which the following description is given by 
the author (/. c. p. 209). Pereion depressum, ex ovali oblongum, postice 
elongatum. Antennce brevtis, articulis paucis ; inferiores superioribus briM lores, 
tonuiores. Cephalon (deursum visum) quadrangulum, aiigulis antcriorihus 
