I. '08. 141 



and backwards and disappearing on the branchial region. 

 From the orbital spine a strong carina runs backwards, fading 

 away between the gastric and hepatic spines, and from the 

 antero-lateral spine, another, even more sharply defined, ex- 

 tends towards the branchial region, becoming obsolete below 

 the hepatic spine. Behind the posterior median spine a faint 

 transverse ridge is situated, reaching downwards on each side 

 to the upper hepatic carina. In the male the two dorsal spines 

 of the carapace are usually conspicuously longer than in the 

 female. 



The abdominal somites are rather broad; the first three are 

 smooth and rounded above in the female, while in the male 

 they often show traces of dorsal carination. On the fourth 

 and fifth somites the dorsal carina is conspicuous in the male, 

 but in the female it is not so pronounced and is sometimes 

 quite obsolete. The sixth somite bears four longitudinal 

 carinae ; posteriorly the margin is produced to a sharp spine 

 on either side of the telson and laterally as an acute angle out- 

 side the bases of the uropods. The pleura of the first three 

 somites are pointed below. 



The antennular peduncle (fig. 9) reaches to rather more than 

 two- thirds the length of the antennal scale ; the second joint is 

 considerably longer than the third and both together are shorter 

 than the basal segment. The lateral process reaches to the 

 distal end of the basal segment ; it is pointed anteriorly and 

 is much longer than broad. The antennal scale is about two 

 and half times as long as broad ; its outer edge is slightly con- 

 cave and is produced to a stout apical spine which extends a 

 little beyond the distal end of the lamellar portion. The basal 

 joint of the flagellum reaches to about three-quarters the length 

 of the scale. ^ 



The outer niaxillipedes are slender, reaching considerably 

 beyond the antennal scale. The first three pairs of pereiopods 

 are practically glabrous, bearing only a very few setae. The 

 second pair (fig. 10) is very slender, reaching beyond the 

 middle of the propodus of the first pair ; the dactylus is scarcely 

 one-fifth the length of the propodus and the carpus and merus 

 are about equal in length, each being a little longer than the 

 ischium. The third pair is very slender and rather longer 

 than the second. The fourth and fifth pairs are much stouter 

 than the two preceding ; the former is longer than the latter 

 and about equal in length to the third. 



The telson is longer than the uropods ; it is broadly sulcate 

 dorsal ly and tapers to a sharp point. It is armed with two or 

 three pairs of dorso-lateral spinules and its inferior margins 

 are &i;rongly ciliated. The outer uropods are slightly shorter 

 than the inner and are from two to three times as long as 

 broad.' 



In the male there are four thoracic and five abdominal 

 sternal spines ; these are absent in the female. As has been 

 already stated by Faxon (1895) , the second pleopod of the male 



lln this respect Milne-Edwards' figure is quite erroneous. 



