Wood-boring Crustacea from Christmas Island. 183 



the basipodites much more expanded than in C. terebrans, 

 that of the last pair about two-thirds as broad as long ; distal 

 segments of last three pairs flattened, the propodus with a 

 row of strong spines on its hinder edge. 



Pleopods (fig. 5) with the peduncle flattened, but not pro- 

 duced on the inner side. First uropods (fig. 1) with peduncle 

 nearly three times as long as endopod, which is about one- 

 third longer but not broader than the exopod; both rami 

 armed with stout spines. Peduncle of second uropods (figs. 1 

 & 2) nearly twice as long as broad, its strongly serrated 

 upper (or outer) edge only slightly curved, not produced as 

 in C. terebrans into a rounded lobe. Third uropods (figs. 1 

 & 2) uniramous, the endopod wanting ; exopod about twice 

 as long as broad. 



Telson (fig. 2) slightly concave, not noticeably carinate, on 

 the dorsal surface, its breadth two-thirds of its length, with a 

 few serrations at the acute point. 



The eggs are large (about *6 mm. in length) atid not more 

 than three were found together in the marsupium. Some 

 ovigerous individuals were found of which the body-length 

 did not much exceed 3 mm., and in each of these the marsu- 

 pium contained only a single egg. In a small series of 

 C. terebrans examined for the purpose of comparison the 

 number of eggs carried by a single female varied from three 

 to eight. 



Adult male (fig. 6). — Length of body about 7 mm. ; 

 greatest breadth about 1*1 mm. 



Third pleon somite with median tubercle more acute but 

 no larger than in female ; lateral tubercles broadened, with 

 deeply concave posterior margin and prominent corners. 

 Proportions of antennules and antennae much as in female 

 except that the antennal flagellum is more than four times as 

 long as broad. 



First gnathopods (fig. 6) larger than in female, about three- 

 sevenths of length of body ; propodus (palm) very massive, 

 with two large unequal teeth about the middle of its palmar 

 edge. 



Peduncle of second uropods (fig. 6) more than twice as 

 long as wide, the setee on its upper edge longer and more 

 numerous than in the female. Exopod of third uropods 

 (fig. 6) three times as long as broad, with a thick brush of 

 very long setae on its lower surface. 



Remarks. — Of the numerous characters in which this 

 species differs from C. terebrans the great size of the anterior 

 gnathopods, the reduction of the median tooth on the third 

 pleon segment, the much longer antennules and antennae, and 



13* 



