402 Surg.-Capt. A. Alcock on 



The antennules are long and are transversely folded, their 

 basal joint is large and inflated. 



The antennae are long, their basal joint is slender and free ; 

 the second joint lies within the internal orbital hiatus. 



The inner edge of the meropodite of the external maxilli- 

 peds is convex, with a pair of little spines at the summit of 

 the convexity ; the succeeding joint arises at the antero- 

 internal angle. 



The thoracic legs are furnished with many spines and long 

 hairs. The chelipeds, which are robust, are unequal ; their 

 prismatic meropodite has all its borders spiny ; the short 

 inflated carpus is sharply granular and spinulate in the distal 

 half of its dorsal surface and along the outer edge, while the 

 inner edge bears a pair of rather large spines ; the palm is 

 spinulate everywhere in the smaller cheliped, but only in the 

 })roximal third of its outer surface in the larger ; the fingers 

 also of the smaller cheliped are spinulate on the outer surface, 

 while those of the larger cheliped are smooth; the cutting- 

 edges of the fingers are finely and unevenly toothed. 



The other thoracic legs are long, compressed, and slender, 

 and have the meropodite spiny along both edges, the carpo- 

 podite and propodite spiny along the front edge, and the 

 dactylopodite styliform. 



Colour in the fresh state yellowish red. 



An egg-laden female from {Station 115, 188-220 fathoms, 

 has the following measurements : — 



Length of carapace 18 millim., breadth of carapace 20 

 millini., length of larger cheliped 27 millim., length of longest 

 leg (fourth pair) 40 millim. 



Family Ocypodidae. 



90. Psopheticus sirididansj gen. et sp. n. 



rsopJieticiis stridulans, "NVood-Mason, Illustratious of the Zoology of 

 ll.lM. I.M.S. 'Investigator,' Crustacea, part i. pi. v. tig. 1 [no 

 clescriptiou]. 



Body and legs smooth and polished, quite devoid of hairs 

 except for a few distant setse on the front edge of the second 

 to fifth legs. 



The canipace is quadrilateral, convex from before back- 

 wards, and its length is three fourths of its breadth. The 

 front is a prominent declivous lamina with the edges entire 

 and sharp. The superior orbital margin is smooth and sharp, 

 and, although strongly excavated on the whole, has a strong 

 median convexity ; the inferior orbital margin is microsco- 



