362 Mr. Jerrreys on the Testaceous Pneumonobranchous 
lentissimé striata. Anfractus 4—5, penultimá vix la- 
tiori. Apertura subtriangularis, dentibus 4—-5, nempe 
2 columellaribus et 2—3 labralibus insignita: peri- 
stomio subincrassato. Umbilicus angustatus. 
Long. 0.06.—Diam. 0.035. 
Turbo Vertigo. Mont. Test. Brit. p. 363. t. 12. f. 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. 
Familia Il. CARYCHIADZJE. Leach. 
Divisio I. Operculo testaceo. 
| 10. Cyclostoma. 
Divisio II. Operculo nullo. 
11. Carychium. 
12. Auricula. 
Genus X. CYCLOSTOMA. Drap. 
Animal anteriore parte capitis. proboscidali.- _ Tentacula brevia, 
| inflata. Oculi subpeduncul: cor 
Testa turrita: anfractibus cylindricis. Apertura Fibolbiculata : 
peristomio incrassato, subreflexo, continuo. Operculum 
nucleatum. 
1. - Exzeans. 
| Animal nimal fasco-griseum : proboscide elongato, contractili. 
^ Pesta ova o-c onica, acuminata, solidior, flavescenti-cinerea, 
sæpè 
