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. 
Dimenstons.— 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. 
