374 Records of the Indian Museum. [Vou. XII, 
tuft of coarse setae. The basal breadth of the hand is little mere 
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 extremely slender, 
less than half the thickness of the fixed finger. Asin allied forms 
the chela is very weakly 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 Pontophilus 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,— 
S9s0 Kilakarai, Ramnad dist., S. India. S. Kemp. 49, 9-14 mm. 
TYPES. 
Genus Aegeon, Guérin Méneville. 
1888. Pontocaris, Bate, Rep. ‘ Challenger’ Macrura, p. 495. 
1900. Aegeon, Stebbing, Marine Invest. S. Africa, I, p. 50. 
1901. Aegeon, Alcock, Cat. Indtan deep-sea Crust. Macrura and Anomala, 
p- 117 (including subgenus Parapontocaris p. 120). 
All the described forms of this genus are represented in the 
collection of the Indian Museum. Three of them, Aegeon orten- 
talis, Henderson, A. habereri, Doflein, and A. lacazet, Gourret, are 
intermediate in character between the more typical species of the 
geuus and those which Alcock referred to the subgenus Parapon- 
