124 



The stout external maxillipeds reach a little beyond the tip of the anten- 

 nular peduncle, and are thickly setose along the dorsal border. 



The 1st pair of legs do not reach to the tip of the antennular peduncle and 

 are not setose. The 2nd pair of legs end in a minute dactylus hidden in setae, 

 and do not reach halfway along the propodite of the first pair. The very slender 

 3rd pair reach to the tips of the external maxillipeds. The 4th and 5th pair 

 are setose, the 4th pair, which reach to the tips of the 2nd pair, being a good deal 

 longer than the 5th pair. 



Length of carapace 8'5 millim., of abdomen 22'5 millim. measured in the 

 middle line. 



Andaman Sea, 405 fathoms, Bay of Bengal off the Ceylon coast 200-350 

 fathoms. 



Regd. Nos. ~ and (Types of the species). 



Family Glypliocrangonidce, S. I. Smith. 



Olyphocrangonidx, S. I. Smith, Report. U. S. Fish. Comm. for 1882 (1884), p. 364. 



Body not compressed, integument very thick and rigid. Rostrum long, 

 sharp, more or less recurved, dorsally flattened, armed laterally with spines. 

 Carapace short, subcylindrical, sculptured, with either its branchiostegal or 

 hepatic spines produced and wing-like. 



Abdomen usually sculptured ; its pleura narrow, vertically produced, and 

 with one or both angles acute or spiniform. The first four abdominal somites 

 interarticulate by means of little shallow ball-and-socket joints, situated on 

 either side at the junction of tergum and pleuron. The last two abdominal 

 segments and the telson interarticulate by means of special ratchet- joints situated 

 on either side at the junction of tergum and pleuron, the mortise of each joint 

 being in the posterior border, the tenon being on the anterior border of the 

 somites : moreover, the recurved lower lip of the mortise is itself dovetailed 

 into a notch in the base of the tenon, so that in extreme extension the joint is 

 tirmly locked. The telson is a strong sharp tapering segment, longer than the 

 caudal swimmerets and quadrate in transverse section. 



Eyestalks short. The antennular peduncle is slender, and supports two 

 short flagella, the outer of which, more especially in the male, is expanded in 

 its basal part: the basal joint of the peduncle is hollowed for the eye and has 

 tlif proximal end of its outer margin slightly expanded to form the rudiment 

 "i a " scale." The antennal scale is broad, oval, and usually has a thickened 

 midrib, its outer edge being thin and rarely ending in a spinule. 



Mandibles slender, not cleft into divaricating incisor and molar branches, 

 not furnished with a palp. The coxa of the 1st maxilla? and 1st maxillipeds, 



