Table I. Sub-family INACHINJ3. 



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 spine that 

 affords no concealment. The basal joint of the antennas is extremely slender throughout, and is usually long. Legs slender. Rostrum either simple, or two-spined, or emarginate 

 (in Platymaia apparently trifid). 



Key to the Indian Genera. 



Alliance 1. Leptopodioida. Antenna? with the basal joint usually sub-cylindrical, or at any rate usually convex on the ventral surface, and independent. External maxillipeda 

 with the merus narrower than the ischium, and often with a large coarse palp, and therefore somewhat pediform in shape. 



. Carapace of the 

 typical Oxy- 

 rhynch shape, 

 elongate-tr i a n - 

 gular or pyri- 

 form. 



'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 Lambrach.eus 



a. 3 Body and ap- a.* "Rostrum 

 pendages very formed of two 



I. Carapace well- 

 calcified, not 

 depressed : ros- 

 trum separated 

 from the cara- 

 pace by a dis- 

 tinct post-ocular 

 constric tion, 

 which sometimes 

 forms a long 

 " neck " 



i. 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. 



t. Free joints of 

 the antenna! pe- 

 duncle slender, 

 cylindrical and 

 not coarsely hir- «{ 

 sute : eye-stalks 

 almost straight : 

 rostrum horizon- 

 tal. 



'J 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. 



.2 Basal anten- 

 nal joint long : 

 epistome spa- 

 cious. 



spiny : some 



post-ocular spi- 

 nules: eye-stalks 

 retractile back- 

 wards, but never 

 concealed. 



long spines ; 

 none of the legs 

 subchelate Echinoplax. 



b.4 Rostrum 

 short, bifid : last 

 pair of legs sub- 

 chelate Grypach^eus. 



o. 3 Body and appendages smooth or 

 with very few spines : no post-ocu- 

 lar spine : the eye-stalks hardly 

 moveable backwards Achjeus. 



0.2 Basal antennal joint very short, not reaching to the 

 i_ front: epistome very narrow Paratymolus 



6.1 Eye-stalks salient and rigidly immoveable : basal antennal joint project- 

 ^ ing beyond and above the apex of the rostrum Physach^us. 



. Free joints of the antennal peduncle short, fiat, and densely hairy : eye-stalks much curved : 

 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 : 



the last pair of legs subdorsal in position Oncinopus. 



II. 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. 



Allinnce 2. Inachoida. Antenna? with the basal joint flattened or concave on the ventral surface, and intimately fused with the surrounding parts, its antero- 

 external angle produced to form a spine which is visible from above on either side of the rostrum. External maxillipeds with the merns as broad as or 

 broader tkun the ischium, and with the palp small. 



I. Rostrum simple: post-ocular spine small: basal antennal spine small 

 moderate. 



1. Branchial regions upraised, and meeting across, and thus concealing the 

 cardiac region : 2nd pair of trunk-legs, in the adult, many times the 



length of the carapace Ji.ncephj 



2. Cardiac region not encroached upon by the normal branchial regions : 2nd 

 pair of trunk-legs of moderate length 



II. Rostrum bifid: post-ocular spine large i basal autenual spine large... 



II: 



1. Eyes hardly retractile 



Eyes retractile against a strong post-ocular Bpine., 



Inachoides. 



Apocremnus. 



CoLLODES. 



