152 Annals of the South African Museum. 



First peraeopod with second joint stout and long, much curved ; 

 the rest of the limb probably long and slender, as in all the 

 specimens it is missing. Second peraeopod with second joint shorter 

 than the rest of the limb, in which the third joint is short but 

 distinct, the denticulate fifth joint longer than the fourth or seventh, 

 the sixth as usual very small. The three following pairs are 

 successively shorter, with no trace of exopods in the female, and in 

 correspondence with this the second joint very slender, whereas in 

 the third and fourth pairs of the male which have exopods this joint 

 is stout. The fifth peraeopod is small in both sexes, but with the full 

 number of joints. 



The pleopods of the male are similar on the first and second 

 segments of the pleon, having a rather long peduncle with two short 

 rami, the inner one-jointed, furnished with five plumose setae, of 

 which three are apical, the outer two-jointed, with four setae, its 

 second joint the shorter. The third and fourth pleon segments show 

 some ventral setae, presumably vestiges of pleopods now absent. 



The uropods have a narrow peduncle, not quite so long as the 

 fifth and sixth pleon segments combined, but much longer than the 

 rami, of which the three-jointed endopod is two-thirds the length of 

 the peduncle, and the exopod little more than two-thirds that of the 

 endopod. In the female specimen figured there are ten spinules 

 along the inner margin of the peduncle, and seven, five, and four 

 respectively on that of the first, second, and third joints of the 

 endopod. 



Average length of adult specimens, 10 mm. 



Locality. Cape Natal N. by E. about 24 miles; depth 805 m. ; 

 No. 12605, sent by Dr. Peringuey. 



GEN. LEPTOSTYLIS, Sars. 



1869. Lcptostijlis, G. O. Sars, Nyt. Mag. Naturv., vol. xvi., p. 343 



(39). 



1900. L., Sars, Crustacea of Norway, vol. iii., p. 67. 

 1911. L., Stappers, Due d'Orleans Campagne Arctique, Crust. 



Malacostraces, p. 116. 



In general agreement with Diastijlis, but having a shorter telson, 

 with lateral spines few or none ; second antennae in male wit h 

 flagellum not very long ; all the species with rudimentary exopods 

 on third and fourth peraeopods of the female ; pleopods of the male 

 less fully developed than in Diastylis. 



This genus appears to suit eleven species, beginning with L. ampul- 



