C R U S T A C E A .
B y E D W A P v D J , MIEES, J u n i o r A s s i s t a n t , Z o o l o g i c a l D e p a r t m e n t , B r i t i s h MuseUxM.
The greater number of the Crustacea here figured have been described by Mr. Adam White. The plates having
been printed off many years since, and the stones destroyed, it has not been possible to alter their lettering, and bring
it into correspondence with the nomenclature adopted in the t e x t ; but whenever I have adopted for any species a
different generic or specific name from th at used by Mr. White, and printed on the plate, a reference has been made
to the latter in the synonyma of the species.
D e c a p o d a B r a c i iy u r a .
Sub-tribe M a i o i d e a , Dana.
Wilke’s U. S. Explor. Exped. XIII., Crust. I., p. 66 (1852).
Genus X e n o c a r c i n u s , White.
App. Juke's Voy. H. M- S. Fly (1847); Proc. Zool. Soc., p.
119 (1847).
(Huenioides, Milnc-Edwards, Ann. Soc. Entom. de France,
{ser. 4) V. p. 144 (1865).
This genus is referred by Dana to his Family Pcriceradcc,
of which the distinctive characters are, the non-retractile
eyes, and moderate legs, but it will probably be necessary
in future systematic an-angements to unite this Family
and the Eurypodddce, Dana, or to modify the characters, for
the eyes are often slightly retractile in the Pcriceradce, and
the genus Oreyonia, placed by Dana in the Eurypodidcc, has
shorter legs than Eurypodius, approaching in this respect
the genera of Periceradw.
The genus Huenioides, Milne-Edwards, is certainly
synonymous with Xeiwcarcinus. I t agi'ees with it in the
narrow elongate form of the carapace and rostrum, in the
eyes, antennie, and outer maxillipeds : also in having the
beak covered with close short hair, and in the tarsi being
finely denticulated beloAV. X . tuherculatus. White, may
be a t once distinguished from X . [Huenioides) conicus,
Milne-Edwards, I. c. p. 144, by its more oblong form,
shorter, stouter rostrum, and strongly tuberculated carapace.
X e n o c a r c i n u s t u b e r c u l a t u s . Tab. 2, fig. 1, a-e.
Xenocarcinus tuberculatus, A. White, Append. Jukes'
Voy. Fly, p. 336 (1847); Proc. Zool. Soc., p. 119 (1847) ;
List Crust. Brit. Mus., p. 123 (1847); A. & M. X. H. [ser.
2) I., p. 221 (1848).
Hab. Cumberland Group. Type. B.M.
Tab. 2, fig. 1. Animal twice nat. size. la Side view
of carapace and rostrum, nat. size. lb. Under surface, .
twice nat. size. Ic. Outer mxped. Id. Outer antenna,
le. Tarsus, all more enlarged.
In the British Museum there are five specimens (three
male and two female) of a species of Xenocarcinus, whicli
I believe is undescribed, and propose to call Xenocarcinus
depressus, in allusion to its flattened carapace.
X e n o c a r c i n u s d e p h e s s u s , sp. n.
Carapace to base of rostrum, when viewed from above,
regularly oval in o u tlin e; the uppersurface flattened.
There are several small granules behind and between the
eyes a t the base of the rostrum, and irregular indistinct
granulated elevations in the middle line, and on either side
of the carapace, occupying nearly the same positions as the
conical tubercles of X. tuberculatus. Kostrum subcylin-
drical, densely pubescent, terminating in two spines and
deeply excavated between them. Eyes, antennie and outer
maxillipeds as in X. tuherculatus. First pair of legs wanting
in the females, in the males they are shorter than the