1910.] AND INVERTEBRATES OF ST. HELENA. 123 



MOLLUSCA*. 

 Class GASTROPODA. 

 Order Pectinibranchia. 



LoTORIIDl. 



Bursa c^elata Broderip. 



Ranella, ccelata E. A. Smith, Marine Mollusca of St. Helena, 

 P. Z. S. 1890, p. 268 ; Melliss, p. 124. 



This species occurs at Ascension and is common on the coast of 

 Panama. I presume this means the Pacific coast of Panama, as 

 Mr. Smith remarks in the paper quoted above that it is extremely 

 remarkable that it should occur at St. Helena. This and the 

 following three species are represented in my collection only by 

 shells inhabited by Pagurus imperator. 



EUGYRINA GIGANTEA. 



Ranella gigantea Lamarck ; Tryon, Manual of Conchology, 

 vol. iii. p. 42. 



According to Mr. Smith this has not been previously recorded 

 outside the Mediterranean. 



Septa nodifera. 



Triton nodiferus Lamarck. 



Mr. Smith recorded Triton tritonis from St. Helena in his 

 P. Z. S. paper above quoted, but from a single specimen in a very 

 worn and broken condition. He thinks it was probably this 

 species, which has a very wide distribution, extending from the 

 Mediterranean to Natal in the Atlantic and from Japan to iSIew 

 Zealand in the Pacific. Melliss does not mention this species, 

 but includes two others of this genus, viz. Triton variegatus 

 Lamarck, and T. olearium Linn. 



Family Cassididj:. 



Cassis testiculus. 



Cassidea testiculus Melliss, p. 124. 



Cassis testiculus var., E. A. Smith, Marine Mollusca of 

 St. Helena, P. Z. S. 1890, p. 257. 



The typical form of this species occurs in the West Indies and 

 on the West African coast. The St. Helena form is stated in 

 Mr. Smith's paper to be the C. crumena of Bruguiere, but he does 

 not consider this to be a distinct species. 



* Species identified by E. A. Smith, I.S.O., F.Z.S. 



