TROCHUS. 791 



Inhabits Saxe-Weimar. Muller. Neighbourhood of Bay- 

 reuth, and is a fresh-water shell. Schroeter. 



Shell three lines long, and two lines and a quarter broad, 

 thick, of a chalky white colour, with five whirls, of which 

 the body-whirl has a strong transverse rib or keel in the mid- 

 dle, and the others are tumid at their margins ; the aperture 

 is roundish and somewhat compressed. 



FLUMiNEUS. 77. Shell nmbilicated, sub-pyramidal, 

 smooth, with the whirls separated by a deep 

 suture, and the aperture roundish. 



Trochus flumineus. Gmelin, p. 3587. 



Trochus callosus, Var. /3. Gmelin, p. 3577- ' 



Trochus elongatus et umbilicatus, absque carina. Schroeter 



Fluss. p. 282. t. 6. f. 12. 

 Trochus, No. 192, and No. 193. ? Schroeter Einl. i. p. 755. 

 Helix laevissima. Gmelin, p. 3641. 

 Helix, No. 242. Schroeter Einl. ii. p. 245. 

 Argenville, t. 27. f. 4.? 



Inhabits the river Huines. Argenville. 



This shell is of about the same size, but rather longer in pro- 

 portion to the breadth, as T. carinatus, of which it is pro- 

 bably only a Variety, and differs principally in wanting a 

 transverse rib on the body-whirl ; it is white, and the sum- 

 mit is said to be tinged with red. 



** Imperforate and erect. 



VESTiARius. 78. Shell conical, convex, smooth, 

 with a gibbous callosity on the base, and the 

 aperture somewhat heart-shaped. 



Trochus vestiarius. Linnaus Syst. Nat. p. 1230. Borfi 

 Mus, p. 334. Chemnitz, v. p. 70. t. 166. f. J 601, a to 

 h. Schroeter Einl. i. p. 665. t. 3. f. 12. Gmelin, p. 

 3578. Schreibers Conch, i. p. 256. 



L'CEil flambe. Favanne, ii. p. 429. t. 12. f. G. 



Bonanni Rec. and Kirch. 3. f. 208 to 210, magnified. 

 Lister Conch, t. 650. f. 45 and 46, t. 65 1 . f. 48, and t. 

 652. f. 49 and 50. Gualter, t. 65. f. F to H. Klein 

 Ost. t. 1. f. 13. Knorr, iv. t. 21. f. 4, and vi. t. 22. f. 7. 

 Geve. t. 19. f. 184 to 191. 

 Variety. With the whirls somewhat uodulous. 



p 2 



