1895.] 
237 
A. Alcock — Carcinological Fauna of India. 
The external maxillipeds have the merus as wide as or much wider 
than the ischium, and the palp inserted at the antero-internal ang’le of 
the merus. 
The rostrum is formed of two spines, which may be horizontal, 
semi-deflexed, or completely deflexed; in the last case the spines are 
usually more or less fused together. 
The ambulatory legs are of no great length. 
Key to the Indian genera. 
CI. 
Alliance 1. Maioid- 
a. — C arapace 
either regularly 
pyriform or sub- 
circular : rostral 
spines horizontal: 
orbits incomplete 
below; but fairly 
well roofed in 
above (1) by a su- 
pra-ocular eave, 
which has at least 
its postero-exter- 
nal angl'e pro¬ 
duced, (2) by a 
post-ocular spine, 
and (3) by a spine 
intercalat ed 
between (1) and 
( 2 ). 
2 . 
Supra-ocular 
eave and interme¬ 
diate spine very 
prominent: eye- 
stalks slender and 
curved, with the 
cornea elongate 
and occupying a 
position more ven¬ 
tral than terminal. 
S upra-ocular 
eave and interme- 
diate spine dis¬ 
tinct, but not very 
prominent: eye- 
stalks stout, with'j 
rounded cornese 
which occupy a 
position as much 
terminal as ven¬ 
tral. 
The antennulary 
flagellum springs, 
or appears to 
spring, from with¬ 
in the orbit. 
ii. The antennulary 
flagellum arises 
quite clear of the 
^ orbit. 
d. Carapace p y r i - 
form : rostral 
spines of consider¬ 
able length, and 
with one or more 
accessory spines 
on the outer sur¬ 
face .. 
ii. Carapace subcir¬ 
cular : rostral 
spines simple, and 
so short as to 
hardly break the 
general outline of 
^ the carapace. 
Maia, 
Paramithrax. 
[Chlorinoides,] 
ScHIZOPHRYS. 
Cyclax. 
Alliance 2. Stenocionopoida. 
— Carapace pyriform, often 
broadened anteriorly: the 
orbits either have the form 
of long semitubular antlers 
which sheathe the eye-stalk, 
but do not protect the eye, 
the cornea in retraction being 
protected by the base of an 
extremely long and promi-<{ 
nent, isolated, post-ocular 
horn; or are reduced to the 
form of long outstanding 
horns similar to those of the 
rostrum: eye-stalks extreme¬ 
ly long: the external maxilli¬ 
peds have the external angle 
much produced : the rostrum 
consists of two long horns. 
1. Orbits in the form of huge 
semi-tubular antlers followed 
by a long isolated post-ocular 
tooth: rostrum vertically 
deflexed : buccal frame much 
broader in front than behind. 
2. Orbits in the form of long 
outstanding horns similar to 
those of the rostrum, which 
is not deflexed, buccal frame 
quadrangular... 
Criocarcinus. 
Stenocionops. 
