72 

 Family Hoplophoridce, Faxon. 



Acanthephyridz (part) and Tropiocaridse, Spence Bate, Challenger Crust. Macrura, pp. 481, 927. 

 Acanthephyridse, Stebbing, Hist. Crust., p. 242. 



Acanthcphyridse (part), Ortmann in Bronn's Thier Eeieh, Arthropoda, p. 1125. 

 Eoplophoridte, Faxon, Mem. Mus. Comp. Zool., XVIII. 1895, p. 159. 



Rostrum either moderately or very well developed. Antennular scale small 

 or quite rudimentary. Antennal scale long, narrow, more or less tapering. 



Mandible with a stout 3-jointed palp and with the incisor and molar pro- 

 cesses distinct but almost confluent, the molar process being small. The 1st and 

 2nd maxilla? and the 1st maxillipeds have the coxa and basis well developed, 

 though the coxa of the 2nd maxilla? is strongly receding. The exopodite of the 

 1st maxillipeds is a broad simple falciform plate, without a flagellum. 



The terminal segment of the 2nd maxillipeds is variable : sometimes it is a 

 narrow plate attached along all its extent to the inner border of the propodite as 

 if it were a small complemental piece of that segment, sometimes it is a 

 distinct and independent dactylus. External maxillipeds stout, pediform. 



All eight pairs of thoracic appendages have well developed exopodites. 



The first two pairs of thoracic legs end in small but well formed chela?, 

 the 2nd pair having the carpus unsegmented. The last three pairs are of 

 moderate length — the longest of them being ne^er much longer than the cara- 

 pace and rostrum combined, if so long — and are of nearly equal size. 



Synopsis of the genera of Hoplophoridse of the Indian Necton. 



I. Outer edge of antennal scale sharply serrated. Exopodites of all the 



maxillipeds and of the 1st pair of legs foliaceous ... ... Hoplophorus. 



II. Outer edge of antennal scale entire : all the exopodites behind those 

 of the 1st maxillipeds have the usual lax lash-like form : — 



1. The thoracic legs are of the usual slender form ... ... Acanthephyra. 



2. Some or all of the thoracic less have the ischium and merus 



broad, compressed and leaf-like ... ... ... Ephyrina. 



Hoplophorus, Edw. 



Oplophorus, Milne Edwards, Hist. Nat. Crust. II. p. 423 : Spence Bate, Challenger Crustacea Macrura, p. 760. 



Body compressed. Rostrum long slender, serrated dorsally and ventrally. 

 Carapace smooth, articulating with the abdomen on either side by a process 

 which is held by the produced antero-lateral angle of the 1st abdominal tergum : 

 an antennal and a branchiostegal spine are present, in addition to the much 

 inflected orbital tooth. 



Abdomen more or less carinated, the carina? of the 3rd, 4th, and 5th terga 

 produced backwards as long spines. Abdominal pleura deep but not very broad 

 fore-and-aft, except those of the 2nd somite in the female ; those of the 3rd, 

 4th, and 5th somites are more or less falcate. Telson long and very acute. 



