1900.] A. Alcock — Carcinological Fauna of India. 455 



border elegantly and evenly serrated and the anterior border fringed 

 with long hair. 



The 4th pair are filiform, not nearly as long as the carapace, and 

 are granular up to the dactylus which is slightly longer than the pro- 

 podite. 



In the female the first 3 abdominal terga are transversely carinate : 

 the carina of the first tergum, which alone is prominent, ends off in a 

 sort of scroll, which flanks the posfcero-lateral angles of the carapace. 



In the Indian Museum are 9 specimens, all adult females, from 

 off the Madras coast in the neighbourhood of Palk Strait and from off 

 Ceylon 34 fathoms. The carapace of the largest is 95 millim. long and 

 11 broad, 



135. Palicus investigator is, n. sp. 



This species is closely related to P. serripes-, but differs in the follow- 

 ing characters : — 



The areolae of the carapace are capped, not by clusters of granules, 

 but by sharp little tubercles between which the surface is smooth : 

 except on the lateral regions of the carapace there is only one such 

 tubercle to each areola : 



(1) the four teeth of the front are all equally acute : the five teeth 

 of the lateral borders of the carapace, though irregular in size, are all 

 very sharp and clean cut : the teeth of the posterior border are smaller 

 and sharper : 



(2) there is no fissure towards the inner end of the lower border of 

 the orbit : 



(3) there are denticles or sharp tubercles, instead of granules, on 

 the arm, wrist, and upper surface of the hand : 



(4) the legs only differ in the case of the 2nd and 3rd pairs in which 

 none of the joints are so broad : the serration of the edges of the merus 

 is different, the terminal spine of the anterior border being greatly en- 

 larged ; the anterior border of the carpus has a spine at each end, but is 

 not otherwise serrated; and the dactylus and propodite, though thin 

 and compressed, and otherwise quite like those of P. serripes, are not 

 broadened, being much less foliaceous. 



In the Indian Museum is a single non-adult male from off the 

 Andamans : its carapace is nearly 7 millim. long and 8 millim. broad. 



Family PTENOPLACID^. 

 Ptenoplax, Alcock & Anderson. 



Archxoplax, Alcock and Anderson, Journ. As. -Soc. Bengal, Vol. LX1II. pt. 2, 

 1894, p. 180. 



J. II. 59 



