56 



Records of the Indian Museum. 



[Vol. XIII, 



two preceding species (c/. text-figs. 5a and h). The tip is truncate, 

 straight or very slightly convex, and bears on either side a small 

 tooth (text-fig. 5e). Occasionally one or other of these teeth is 

 missing. 



The ciliated and non-ciHated portions of the external border 

 of the outer uropod are separated by a small tooth. In adults 

 the non-ciliated part is from r2 to 1-4 times the length of the 

 ciliated part (text-fig. yc). 



Acetes insularis is a small species, large females not exceed- 

 ing 18 mm. in length. 



The collection contains specimens from one locality only : — 



2ii*ifi Mouth of Raiano- R., Sarawak, 

 Borneo 



Mas. Collr. 



Man}' 



The types bear the number 971^/10 in the register of the 

 Zoological Survey of India. 



Acetes japonicus, Kishinouye. 

 (Text-figs. ih,i, 2d, 3^, 4d, 5/, 6, yd.) 



1905. Acetes Japonicus, Kishinouye, Amiof. Zool. 'JapO)i., V, p. 163, text- 

 figs. 



The eyes resemble those of the two preceding species but are 

 rather shorter, a little less than one-third the length of the 

 carapace. 



The basal segment of the antennular peduncle of the female 

 is about i^ times the length of the 

 second and third segments combined ; 

 the second segment is fully 3 times and 

 the third 5^ times as long as broad 

 (text-fig. li). In the male the propor- 

 tions of the second segment are about 

 the same ; the third segment is greatly 

 lengthened as in A. indicus and A. in- 

 sularis : it is longer than the basal seg- 

 ment and at least 10 times as long as 

 broad (text-fig. ih). 



The outer antennular flagellum of the 

 female resembles that of A. insularis in 

 the possession of two clasping spines, 

 but does not bear the additional appa- 

 ratus found in that species. One of the 

 two clasping spines is very much longer 

 than the other and is feebly serrate on 

 its inner margin near the apex. The 

 segments opposite the tips of the clasping 

 spines each bear a small blunt process at 

 the proximal end and one or two short 

 spinules distally (text-fig. 2d). 



Fig. 6. — Acetes japonicus.- 



Terminal segment of outer 

 maxillipede. 



