Table I. Sub-family INACHIhL®. 
Eyes without orbits; the eye-stalks usually long and slender, and either non-retractile, or retractile against the carapace or against an acute post-ocular spinule or 6pine that 
aftouis no concealment. 1 he basal joint of the antennae is extremely slender throughout, and is usually long. Legs slender. Rostrum either simple, or two-spined, or emarginate 
in Platymaia apparently trifid). J 6 h y y 
Key to the Indian Genera. 
Alliance 1 . Leptopodioida. Antennae with the basal joint usually sub-cylindrical, or at any rate usually convex on the ventral surface, and independent. 
" ith the merus narrower than the ischium, and often with a large coarse palp, and therefore somewhat pediform in shape. 
External maxillipeds 
Carapace of the 
typical 0 x y - 
rhynch shape,, 
elongate -trian- 
gular or 
form. 
pyri- 
f i. Chelipeds both markedly longer and vastly stouter than the longest legs : rostrum simple and much longer than 
the carapace : post-ocular “ neck ” at least as long as the carapace. Lambrachjeus 
1. Carapace well- 
calcified, not 
depressed : ros¬ 
trum separated 
from the cara¬ 
pace by a dis--j 
tinct post-ocular 
constric tion, 
which sometimes 
forms a long 
“ neck.” 
ii. Chelipeds ne¬ 
ver approaching 
the longest legs 
in length: ros¬ 
trum bifid and 
never approach- , 
ing the carapace ' 
in length : post¬ 
ocular neck, 
when distinct, 
short. 
r 
a. Free joints of 
the antennal pe¬ 
duncle slender, 
cylindrical and 
not coarsely hir- ] 
sute : eye-stalks 
almost straight: 
rostrum horizon¬ 
tal. 
ad Eye-stalks 
salient, but free¬ 
ly moveable for¬ 
wards and some¬ 
times backwards: < 
basal antennal 
joint not reach¬ 
ing to the apex 
of the rostrum. 
a. 2 Basal anten¬ 
nal joint long : 
epistome spa¬ 
cious. 
fa.S Body and ap¬ 
pendages very 
spiny: some 
post-ocular spi- 
nules: eye-stalks 
retractile back¬ 
wards, but never 
■i concealed. 
a.* Rostrum 
formed of two 
long spines; 
none of the legs 
subchelate. Echinoplax. 
bA Rostrum 
short, bifid: last 
pair of legs sub¬ 
chelate. 
Grypach^us. 
ft.3 Body ami appendages smooth or 
with very few spines : no post-ocu¬ 
lar spine: the eye-stalks hardly 
moveable backwards. Ach.sus. 
b . 2 Basal antennal joint very short, not reaching to the 
[_ front: epistome very narrow.. Paratymolus. 
b.l Eye-stalks salient and rigidly immoveable : basal antennal joint project- 
[_ ing beyond and above the apex of the rostrum. 
Physach*us. 
, b. Free joints of the antennal peduncle short, flat, and densely hairy: oye-stalks much curved : 
y L rostrum somewhat depressed : a post-ocular tooth. Camposcia. 
2. Carapace semi-membranous, exceedingly depressed and flat: rostrum in unbroken continuity with the carapace : no post-ocular spine : 
L the last pair of legs subdorsal in position. . Oncinopus. 
11. Carapace nearly circular. [Epistome narrow : a large post-ocular spine against which the eye is retractile, but which affords no concealment : basal anten¬ 
nal joint perfectly free, legs long, with much flattened blade-like joints : rostrum trifid.]. 
Platymaia. 
Alliance 2. Inachoida. Antennae with the basal joint flattened or concave on the ventral surface, and intimately fused with the surrounding parts, its antero- 
exterual angle produced to form a spine which is visible from above on either side of the rostrum. External maxillipeds with the merus as broad as or 
broader than the ischium, and with the palp small. 
f 1. Branchial regions upraised, and meeting across, and thus concealing, the 
cardiac region : 2nd pair of trunk-legs, in the adult, many times the 
I. Rostrum simple: post-ocular spine small: basal antennal spine small or] length of the carapace.. * . Encephaloides. 
moderate. 
2. Cardiac region not encroached upon by the normal branchial regions: 2nd 
pair of trunk-legs of moderate length. Inachoides. 
C 1. Eyes hardly retractile. Apocremnus. 
11. Rostrum bifid : post-ocular spine large : basal antennal spine large... ... < 
(2. Eyes retractile against a strong post-ocular spine..... Collodes. 
