175 



There are only a few granules on the abdominal pleura and almost none on 

 the terga. The median carina of the Gth abdominal tergum is even more 

 incomplete. 



In the large chelipeds the fingers are longer than the carpus and longer 

 than the palm. 



In all other respects this species agrees with P. gibbus. 



In the unique specimen the length of the carapace in the middle line is 

 38"5 millim., of the abdomen 48*5 millim., of the large chelipeds 82 millim. 



From the open part of the Bay of Bengal, on the slope of Carpenter's 

 Ridge : 1370-1540 fathoms. 



Regd. No. '— (Type of the species). 



103. PeiitacJielcs Beaumoiitii, Alcoek. 



Pentacheles Beaumontii, Alcoek, Ann. Mag. Nat. Hist., March 1894, p. 236. 

 Illustrations op the Zoology of the Investigator, Crustacea, Plate VIII. Fig. 3. 



Carapace depressed, its lateral borders parallel in their posterior half, curved 

 and convergent anteriorly, its surface when denuded is finely granular, without 

 any large spines, except a few on the dorsal carina. The frontal border is 

 concave and presents, in addition to a pair of rostral spines, a strong spine at 

 either angle of either orbital notch, and a spine at the frontal end of the impact- 

 ed eye-stalk. Its lateral borders are armed with about 23 or 24 spines, namely 

 7 or 8+ 3 in front of the cervical groove and 12 or 13 behind it. Its posterior 

 borders are perfectly smooth. The dorsal carina is finely granular and double 

 and has no large spines except a few where it traverses the middle of the gastric 

 region. Behind the cervical groove, skirting the lateral border, on either side, 

 is a fine granular ridge. Of the two ridges of the sidewalls of the carapace the 

 dorsad one is distinct only in front of the cervical groove. 



The abdominal integument is smooth to the naked eye, and the edges of 

 the terga and pleura are smooth. The lst-oth terga are carinated in the middle 

 line the carina? of the first 3 terga culminating anteriorly in an antrorse spine. 

 The 6th tergum is quite smooth. 



The antennular scale appears to have been of the broad type of P. gibbus and 

 Carpenteri. There is a single spine at the outer angle of the basal joint of the 

 antennular peduncle. 



The slender antennal scale almost reaches the end of the antennal peduncle. 



The large chelipeds (in the male) are more than a telson-length longer than 

 the body : the lower border of the merus is spinose, some of the spines being 

 of fair size, and the upper border spinulose, and both borders of the palm are 

 spinulose : at the far end of the upper border of the merus and palm and of 



