374 Records of the Indian Museum. [Vol. XII, 



tuft of coarse setae. The basal breadth of the hand is little more 

 than one third its entire length. The "thumb" of the subchela 

 is stout and strongly deflected outwards. On the inner surface 

 near the base of the propodus there is the usual tuft of coarse setae. 



The second peraeopods (text-fig. 6d) reach about to the end of 

 the merus of the first pair. The chela is a trifle longer than the 

 carpus and is remarkable in that the dactylus is extremel}'- slender, 

 less than half the thickness of the fixed finger. As in allied forms 

 the chela is ver^^ weakl}' constructed and is without terminal claws 

 or definite cutting edges. The palm is about two thirds the length 

 of the fingers and the propodus on its outer margin is densely 

 fringed with long setae. 



The slender third peraeopods reach beyond the scale by the 

 whole length of the two ultimate segments. The merus is a little 

 longer than the ischium and a little shorter than the propodus and 

 dactylus combined. The carpus is twice the length of the ischium. 



The fourth and fifth peraeopods are similar and stouter than 

 the third. The merus is a little longer than the subequal carpus 

 and propodus and about three times the length of the dactylus. 

 The segments are rather densely clothed with hairs. 



The abdominal somites are quite smooth, without carinae or 

 grooves, and the margins of the pleura are rounded below. The 

 sixth somite is about equal in length with the telson. The inner 

 ramus of the last four pairs of pleopods is very short and does not 

 possess an appendix interna. The uropods are half as long again 

 as the telson and the exopod is nearly four times as long as broad. 



The telson is rather broad at the base, but much narrowed at 

 the apex. The margins are setose and there are two pairs of dorso- 

 lateral spinules. The tip is triangular and sharply acute ; beneath 

 it three pairs of spinules arise, the innermost two thirds the length 

 of the intermediate pair and two and a half times as long as the 

 outer. 



The colour in life of Pontophilns parvirostris was pale, mottled 

 and spotted with dark umber, tending to maroon at the sides and 

 on the appendages and forming distinct blotches on the pleura of 

 the first, fourth and sixth abdominal somites. 



The specimens are registered thus, — 



«a«_Q Kilakarai, Ramnad dist., S. India. S. Kemp. 4?, 9-14 mm. 



Types. 



Genus Aegeon, Guerin Meneville. 



1888. Ponfocaiis, Bate, Rep. ' Challenger' Macriira, p. 495. 



1900. Aegeon, Stebbing, Marine Invest. S. Africa, I, p. 50. 



1901. Aegeon, Alcock, Cat. Indian deep-sea Crttst. Macnira and AnoDiala, 



p. 117 (including subgenus Farapontocaris p. 120). 



All the described forms of this genus are represented in the 

 collection of the Indian Museum. Three of them, Aegeon orien- 

 talis, Henderson, A. haheren, Doflein.and A. lacazei, Gourret, are 

 intermediate in character between the more typical species of the 

 geuus and those which Alcock referred to the subgenus Parapon- 



