1895.] 
A. Alcock —Carcinological Fauna of India. 
191 
II. Rostrum flanked 
on either side by 
salient supra-ocu- 
lar spines; either 
long and simple, 
or consisting of 
two spines of mo¬ 
derate length : no 
post-ocular pro¬ 
cess. 
1. Carapace elon- 
g a t e -t r i angular, 
rostrum elongate, 
simple: ambula¬ 
tory legs not sub¬ 
chelate. 
i. Rostrum laterally 
compressed, su- 
pra-ocular spines 
small: eye-stalks 
so short and deep¬ 
ly sunken as to 
hardly reach to the 
sides of the cara¬ 
pace ; carapace of 
the female with 
large foliaceous 
lateral lobes. 
ii. Rostrum horizon¬ 
tally compressed, 
supra-ocular 
spines large: eye- 
stalks short, but 
reaching beyond 
the sides of the 
carapace: cara¬ 
pace of the female 
without foliaceous 
lobes. 
Huenia. 
MeNjETHIUS. 
2. Carapace broad, sub-quadrangular: ros¬ 
trum short and deeply bifid, ambulatory 
legs subchelate. Acanthonyx. 
Xenocarcinus, White. 
Xenocarcinus, White, Jukes’ Voyage H. M. S. ‘ Fly,’ Vol. II. p. 335. 
Huenioides, A. Milne-Edwards, Ann. Soc. Entomol. France (4) V. 1865, p. 144. 
Xenocarcinus , Miers, Journ. Linn. Soc., Zool., Vol. XIV. 1879, p. 648, pi. xii. 
fig. 5. 
Carapace ovate-subcylindrical, tapering to a long thick subcylin- 
drical rostrum, or beak, the tip of which is emarginate or bifid. 
Eyes short, completely sunken in the sides of the rostrum, almost 
immovable : no prae-ocular or post-ocular spines. 
Antennae with the basal joint triangular, and with the short mobile 
portion hidden beneath the rostrum. 
External maxillipeds with the merus as broad as the ischium and 
giving attachment to the palp at its antero-internal angle. 
Chelipeds not much shorter or stouter than the 2nd and 3rd pairs 
of legs : 4th and 5th pairs of legs short: all with the dactyli short, 
stout, curved, and sharply toothed along the posterior surface. 
Abdomen of the female four-jointed, the 3rd — 6th segments being 
fused together. 
