STALKED BARNACLES IN THE COLOMBO MUSEUM. 195 



Measu rem en ts. 



Length of capitulum ... ... 5 mm. 



Breadth of capitulum ... ... 4 mm. 



Length of peduncle ... ... ]*.5 mm. 



This interesting species is represented by several specimens, 

 growing, side by side with D. equina, on the ventral surface of a 

 sea-snake (Hydrus ijlaturus) from the coast of Ceylon. 



All the members of the genus Dichelaspis are notable for the 

 reduction of the capitular plates which they exhibit. In D. 

 ienuivaluata, however, the degeneracy is of structure rather than 

 of form. The five plates represented are all large, but their 

 calcification is so imperfect that although the mantle is very 

 transparent, I was unable to see their limits without staining the 

 specimens. Even when thus prepared they were by no means 

 easy to examine critically, and failed entirely to discern the 

 lower termination of the scuta. On the whole, the affinities 

 of the new form would seem to lie with Lanchester's D. occlusa 

 (P. Z. S., 1902 (2) ) from the east coast of the Malay Peninsula. 

 From this species it may be distinguished by its extremely short 

 peduncle and imperfectly differentiated but undivided scuta. 



2 D 8(17)05 



