NO. 1876. ON THE CRUSTACEAN ORDER CUMACEA—CALMAX. 



669 



Fig. 9G.— Oxyurostylis 

 smithi, immature fe- 

 male, fourth leg. 



The peduncle of the uropods falls a little short of the tip of the 

 telson and has about ten strong spines on its inner edge. The rami 

 are subequal, and, excluding the terminal spines, about two-thirds 

 as long as the peduncle. The endopod has three segments, of which 

 the first is distmctly, and the third slightly, 

 longer than the second; there are about eight 

 spines on the inner edge and a stout terminal 

 spine. The exopod has a few slender spines on 

 its outer edge. 



Male. — Total length, 7.3 mm. 

 Carapace less than one-third of total length, its 

 depth distinctly less than two-thirds of its length, 



the dorsal outline 

 less arched than in 

 the female. The 



ridges of the carapace are arranged as 

 in the female, but there are only two 

 transverse ridges on the frontal lobe and 

 there is a horizontal ridge a little above 

 the lower margin between the hinder 

 edge and the posterior oblique ridge. 



The postero-lateral angles of the last 

 thoracic somite are strongly produced 

 and acute. The telson is twice as long 

 as the last somite, with about seven 

 pairs of lateral spines. It is dorsally 

 "humped" in the usual way and the 

 structure of the apex is as in the female. 

 The antennules have the third seg- 

 ment of the peduncle about as wide as 

 the first, with a terminal brush of fme setse. The convex area 

 bearing the setse is, however, distinctly defined from the body of 



Fig. 97.— Oxyurostylis smithi, imma- 

 ture female; a, last somite, telson, 



AND UROPOD FROM ABOVE; 6, APEX OF 

 TELSON FROM THE SIDE, FURTHER EN- 

 LARGED. 



Fig. 98.— Oxyurostylis smithi, male, from the side. 



the segment by a line of apparent articulation, and it would seem 

 to be in fact the enlarged proximal segment of the outer flagellum.^ 



1 1 suspect that a similar arrangement will be found in all those Diastylidae which have been described 

 as carrying a brush of setse on the male antennular peduncle. Compare also the structure of the male 

 antennule in Heterocuma weberi. (Rep. Cumacea Siboga, p. 7, pi. 1, fig. 9.) 



