144 RATHBUN 



middle, anterior margin with one tooth near the tip, and at base a long 

 curved spine. Sides of carapace carinated in such a way as to form 

 irregular quadrangular spaces, with spines at most of the angles ; four or 

 five of these spines form an irregular lateral carina, the anterior spine 

 being much the longest, about four fifths the length of the rostrum. On 

 the anterior margin of the carapace there is a spine at the outer angle of 

 the orbit and another at the antero-lateral angle. The antennular 

 peduncle is two thirds as long as the carapace ; the second segment is 

 more than twice as long as the third ; the basal scale is very short and 

 ovate ; the outer flagellum is very much stouter and twice as long as the 

 inner. The antennal scale is as long as the antennular peduncle but not 

 so long as the antennal peduncle ; the laminar portion projects consider- 

 ably beyond the short, stout outer spine; the outer margin is slightly 

 concave. The flagellum when bent back reaches the sixth abdominal 

 segment. The maxillipeds reach beyond the antennal peduncle by half 

 the length of the dactylus. The first pair of feet are about as long as the 

 maxillipeds; the upper margin of the merus terminates distally in a 

 tooth ; the hands are narrow-elongate, about four times as long as wide ; 

 the digital spine is very long and slender and directed in an obliquely 

 longitudinal direction; the anterior margin is more longitudinal than 

 transverse. The third pair of feet (it is to be borne in mind that the 

 second pair are absent) are very slender and barely reach to the end of the 

 first pair ; the fourth and fifth pairs are of about equal length, and stretch 

 a little beyond the first pair. 



The abdomen behind the second segment is carinate, the carina of 

 the third segment being especially high ; on the sixth and seventh seg- 

 ments it is medially sulcate. The first to fifth segments are deeply 

 sculptured with transverse grooves, and their inferior margins are 

 pointed, those of the fourth and fifth segments being sharply so. In the 

 male the pleura are much more spiniform than in the female. The 

 fourth segment has on each side of its posterior margin a blunt tooth ; 

 the fifth segment has a corresponding spine. The sixth segment has on 

 each side two lateral and one posterior spine. The telson is armed with 

 two small spines at the proximal end, and three pairs of lateral spinules 

 on the terminal half. The outer uropod is shorter than the inner, is 

 obliquely truncated at the end, and has a broad blunt tooth at the 

 postero-lateral angle. The median ventral line of the pleon is armed 

 with very long spines. 



Dimensions. Female with eggs, length of body measured from tip of 

 spine at anterior base of rostrum 47.4 mm., length of carapace from 

 same point 16 mm., length of carapace from posterior line of orbit 12 mm. 



