362 Mr. Jeffreys on the Testaceous Fneumonohranchous 



lentissimfe striata. Anfractus 4 — 5, penultim^ vix la- 

 tiori. Apertura subtriangularis, dentibus 4 — 5, nemp^ 

 2 columellaribus et 2 — 3 labralibus insignita : peri- 

 stomio subincrassato. Umhilicus angustatus. 



Long. 0.06.— Diam. 0.035. 

 Turbo Vertigo. Mont. Test. Brit. p. 363. 1. 12./. 6. 



Among the rejectamenta of a small stream at Marino 

 near Swansea, but very sparingly. 



Besides the very different contour and more contracted 

 aperture of this shell, the circumstance of the teeth being 

 more sunk in some specimens than in others (which pecu- 

 liarly denotes the growth of dentate shells), sufficiently 

 refutes the idea of its being the young of the V. pusilla. 



Familiall. CARYCHIADiE. Leach. 



Divisio I. Operculo testaceo. 



10. Cyclostoma. 

 Divisio II. Operculo nullo. 



11. Carychium. 



12. Auricula. 



Genus X. CYCLOSTOMA. Drop. 



Animal anteriore parte capitis proboscidali. Tentacula brevia, 



inflata, Oculi subpedunculati. 

 Testa turrita : anfractibus cylindricis. Apertura suborbiculata : 



peristomio incrassato, subreflexo, continuo. Operculum 



nucleatum. 



1. Elegans. 



Animal fusco-griseum : prohoscide elongato, contractili. 

 Testa ovato-conica, acuminata, solidior, flavescenti-cinerea, 



saep^ 



