852 TURBO. 



Linnaeus, without any reference, has described this shell to 

 be of the size of a lupine seed, red, solid, plano-convex 

 above, and concave beneath, with a wide-spreading umbili- 

 cus; whirls rounded, striated longitudinally, and the strise 

 crenated. 



THERMALis. 86. Shell umblHcated, rather oblong, 

 and obtuse ; whirls rounded and smooth. 



Turbo thermalis. LinntEus Si/st. Nat. p. 1237- Schroe- 



ter Einl. ii. p. 34. Gmelin, p. 3603. 

 Turbo fontinalis. Donovan, iii. t. 102. Montagu Test. p. 



348. t. 22. f. 4. Maton and Racket, in Lin. Trans. 



viii. p. 168. Dorset Cat. p. 50. t. 18. f. 3 and 4. 

 Nerita piscinalis. Muller Verm. ii. p. 172. 

 Trochus cristatus. Schroeter Fluss. p. 280. t. 6. f. 11. 

 Helix piscinalis. Gmelin, p. 3627. 

 Helix fascicularis. Gmelinf p. 3641. 

 Helix, No. 246. Schroeter Einl. ii. p. 246. 

 Petiver Gaz. t. 18. f. 2. Walker's Minute Shells, f. 56. 

 Junior. Shell smaller. 



Nerita pusilla. Muller Verm. ii. p. 171. 

 Helix, No. 319. Schroeter Einl. ii. p. 268. 

 Helix pusilla. Gmelin^ p. 3627. 

 Martini Berl. Mag. iv. t. 8. f. 26. 

 Inhabits rivers and other fresh waters. Great Britain. Peti- 

 ver, 8fc. Near the Baths of Pisa. Limmus. Lakes of 

 Germany, and fish-ponds in Denmark. Muller. 

 Shell about a quarter of an inch long, and equally broad, thin, 

 sub-pellucid, horn-coloured, and composed of four or five 

 much rounded prominent whirls, which are slightly striated 

 longitudinally. There does not appear to be much doubt 

 that this is the T. thermalis of the Systema Naturae, and 

 though so dissimilar in appearance, Linnaeus may probably 

 have placed it next to T. scalaris on account of its deep 

 umbilicus, and of its having the whirls only slightly at- 

 tached to each other. The animal belongs to Muller's ge- 

 nus Valvata. 



SCALARIS. 87. Shell conical, with eight rounded 

 detached whirls connected together by longi- 

 tudinal ribs. 



Turbo scalaris. Linncsus Syst. Nat. p. 1237. Martini, 

 iv. p. 263. t. 152. f. 1426, 1427, 1430, and 1431 ; and 

 t. 153. f. 1432 and 1433. Born Mus. p. 354. Schroeter 



