INTRODUCTION. 21 



Introduced by Colonel Montagu, who found it 

 as British in the Portland Museum ! Mr. Jeffreys 

 adds it to his list, at the same time expressing a 

 doubt, as Mr. Clark had found it among W. Indian 

 shells. It is one of the most common shells in the 

 small boxes from the West Indies, and forms a par- 

 ticular genus of Auricula, characterised by having 

 only a single plait on the front of the pillar. 



8. Tralia pusilla Gray. 



Auricula pusilla Desk., Lam. Hist, ed. 2. 332. 



Voluta pusilla GmeL 3436. 



Bulimus ovulus Brug. 71. 



Auricula ovula Ferus. P. 104. Portez, Gall, i. 204. 



t. 20. f 13, 14. 

 A. nitens Lam. 



Voluta triplicata Donovan, B. S. 1. 138. 

 Melampus ovulum Lowe, Zool. Journ. v. 289. 



Inhab. West Indies. 



Introduced by Donovan as found on the shores 

 of Guernsey. This forms a genus (peculiar for 

 having a simple internal lip, with a subposterior 

 internal groove, where the notch occurs in Sidula 

 felis Catti) between Sidula and Pedipes. 



9. Aplexus rivalis f. 112., Maton and Racket, L. 



Trans, xiii. 126. t. 4. f. 2., Turton, Man. ed. 1. 



128. f. 112. 

 Physa marmorata Guilding MSS. 



Inhab. West Indies, St. Vincent's. Rev. L. 

 Guilding. 



Introduced by Dr. Maton and Mr. Racket. Said 

 to have been found by Mr. James Hay, in Hamp- 

 shire. 



