Indian Deep-sea Dredging. 189 



and broader than those of any of the described species, and 

 their inner or ensheathing branch is much less deeply semi- 

 tubular, being indeed only slightly incurved along its lower 

 margin and forming by its union with its fellow of the oppo- 

 site side a strongly compressed tube, of which the lumen 

 appears to be entirely filled by the two flat outer or olfactory 

 branches of opposite sides. There is little doubt that this 

 special development of the antennules has a causal relation to 

 the presence of delicate sense-organs, which, owing to some 

 unknown circumstances in the surroundings of the animal, 

 stand in special need of protection. 



This form had previously been found at 65 fathoms off 

 Chittagong, at 68 fathoms off the Mahanadi Delta, and at 

 70 fathoms off the God&vari Delta. 



Gennadas, Spence Bate. 



5. Gennadas parvus, Spence Bate. 



Gennadus parvus, Spence Bate, Ann. & Mag. Nat. Hist. (5)viii. p. 191 ; 

 and 'Challenger' Macrura, 1888, p. 840, pi. lix. 



A male and a female from Station 101, 922 fathoms, and 

 Station 103, 1260 fathoms respectively, belong, there is little 

 doubt, to the above species, which has such a wide geogra- 

 phical and bathymetrical range. Both were of a uniform 

 deep lake-colour. Amahpemeus elegans, S. I. Smith, is 

 probably the same species. 



Hepomadus, Spence Bate. 



6. Hepomadus ? tener, S. I. Smith. 



Hepomadus ? tener, S. I. Smith, Ann. Rep. Comm. Fish. 1884, p. 409 

 [65], pi. ix. figs. 7 and 8. 



A female specimen was obtained at Station 97, 1310 

 fathoms, but is too much macerated for exact determination. 

 Its colour in the fresh state was bright orange. 



Hemipen^eus, Spence Bate. 



7. Hemipenaius Garpenteri, sp. n., Wood-Mason. 



Is closely allied to Hemipenceus spinidor salts, Spence Bate, 

 but differs in the following relations : — The thoracic legs are 

 shorter, the three anterior pairs have the ischiopodite stouter, 

 and longer in proportion to the succeeding joint, and the two 

 last pairs are more filiform ; the exopodites of the abdominal 

 appendages are much longer ; the rostrum is much weaker 



