130 A. Alcock — Carcinological Faima of India, [JS"©. 3, 



Family I. Homolid.^ restr. 



Carapace elonorafce-qnadrangular, or ovoid, or urn-sliaped. 



Tei-niinal joint of tlie eyesfcalk (with the eye) either longer or 

 shorter than the slender basal joint. Antennal flagella much longer 

 than the carapace. 



External maxillipeds pediform or subpediform. 



The gill-plumes are 14 in number on either side, and there are 

 epipodites to the chelipeds and first two pair of legs. 

 Homola, Paromolopsis and Hypsophrys, vid. seq. 



Family II. Latreillidae. 



Carapace elongate-quadrangular, or piriform. 



Basal joint of eye-sfcalk very much, longer than the terminal joint. 

 Antennal flagella not so long as the carapace. 

 External maxillipeds sub-operculiform. 



The gill-plumes are 8 in number on either side and there are no 

 epipodites to the chelipeds or legs. 

 Latreillia and Lati-eillopsis, vid. seq. 



Tribe DROMIIDEA. 



Family HOMOLODROMID^. 



Arachnodromia, Alcock. 

 Arachnodromia, Alcock, Investigator Deep Sea Brachyura, p. 17. 



Carapace elongate-oblong but somewhat broader behind than in 

 front, deep, inflated, tomentose, its texture thin but well calcified : two 

 creases break either lateral border, the posterior one being the more 

 distinct and being continued to the cardiac region ( = branchial groove), 

 the anterior one, or true cervical groove, not proceeding far on to the 

 dorsum of the carapace. 



The front is horizontal, prominent, and deeply bifid. 



The antennule and eye of either side are completely retractile into 

 a common deep fossa (just as in Dromia) which affords them complete 

 protection. As in Droviia, the floor of this common antennular-orbital 

 fossa is formed by a subocular (" antennal ") tooth in contact with the 

 basal joint of the antenna, and, as in Dromia, the outer wall of the 

 orbit is breached by a wide gap. The orbital portion of the fossa> 

 which is loosely filled by the eyes, has the hollow for the eyes much 

 deeper than the hollow for the eyestalk. The eyestalks are long and 

 slender, the eyes small but perfectly formed and well pigmented. 



The two basal joints of the antennas, which are quite freely mov- 

 able, largely fill the gap in the lower wall of the orbit, and lie in the 



