430 BALANID£S. 



species, with the exception that the carinal end of the growing or under 

 surface of the Tergum is much squarer. 



Cirri. — The only difference which I could perceive was, that the 

 rami of the first pair were not quite so unequal in length. 



Species Dubia. 

 3. Platylepas ? 



Hab. — Imbedded in the skin of a sea-snake, taken off Borneo. 



I am indebted to Dr. Gray for a single specimen of this 

 supposed species, but as it is very young and imperfect, 

 wanting the opercular valves and cirri, I do not choose to 

 name it. The shell presents all the usual characters of the 

 genus ; the rostrum, I may remark, being pushed to the 

 left side. The parietes are permeated by pores of consider- 

 able size, which shows that the species is distinct from 

 P. decorata. On the inner basal surfaces of the walls, 

 there are two or three very distinct ridges on each side of 

 the midrib ; and this fact, together with the size of the 

 parietal pores, makes me suspect that it is not an immature 

 specimen of P. bissexlobata. 



10. Genus — Tubicinella. PI. 17, fig. 3 a — 3 c. 



Tubicinella. Lamarck. Annales du Museum, torn. 1 (1S02), 



Tab. 30, fig. 1. 

 Coronula. Be Blainville. Diet, des Sciences Naturelles, (3S24). 



Compartments six, of equal sizes ; shell sub-cylindrical, 

 wider at the top than at the basis, belted by several large 

 transverse ridges. 



Uab. — Southern Pacific Ocean, Western South America, New South Wales, 

 Cape of Good Hope ; imbedded in whales, and often associated witli Coronula 

 balcenaris. 



This genus is closely allied to Coronula, and perhaps De 

 Blainville was right in uniting them. But Coronula, as it 

 now stands, is so natural a genus, that it seems a pity that a 



