32 



Cervical groove fine but conspicuous. An orbital and branchiostegal spine : no 

 hepatic spine. 



The last 3 or 4 abdominal terga are carinated. 



The terminal joint of the mandibular palp is subtriangular and rather 

 narrow. The exopodite of the 2nd maxillipeds is slender subcylindrical and 

 rather lax, but is very decidedly longer than the endopodite. Dactyli of the 

 last two pair of thoracic legs setiform. 



No podobranch on the 3rd pair of thoracic legs and no epipodite on the 4th. 

 The pleurobranchire in advance of somite XIV though small and slender are 

 plumose and functional. 



The branchial formula is as follows : — 



Synopsis of the Indian species of the subgenus Hemipeneus. 



I. Tbird abdominal tergum carinated in its posterior balf, a large 



booked spine spiiugiug from the carina ... ... ... A. (H.) Carpenter i. 



II. Tbird abdominal tergum non-enrinate ... ... ... A. (H.) crassipes. 



13. Aristceus (Hemipeneus) Carpenteri, Wood-Mason. 



Hemipeneus Carpenteri, Wood-Mason, Ann. Matt. Nat. Hist., Feb. 1891, p. 189, and Oct. 1891, p. 286. 

 Illustrations of the Zoology op the Investigator, Crustacea, Plate XLIX. Fig. 4, ?. 



Glabrous. Kostrum in the female (male unknown) much less than a third 

 the length of the rest of the carapace in the mid-dorsal line, its tip just reaching 

 to the end of the eyes, its carina distinct to within a short distance of the 

 posterior border of the carapace. 



The normal number of rostral teeth is three, but by damage followed by 

 imperfect repair the number may be reduced to 2 or increased to 4. 



The cervical groove is very distinct, as also is a longitudinal post-orbital 

 ridge that runs to meet it. Very distinct also are the longitudinal ridges and 

 grooves that traverse the branchial region. 



