26 BITHINIAD^. 



3. 1. BiTHiNiA tentaculata. Tentacled Bitliinia. 



— Shell oval -oblong, yellowish horn - colour, 

 smooth, semitransparent, with five rather flat 

 volutions, and without umbilicus, (t. 10. f. ]20.) 



Helix tentaculata. Linn. Fauna Suec. 531. {List. Aug. t. 2. f. 

 19.); Gmel. 3662.; Mont. 389. — Bulimus tentaculatus. 

 Poiret, 61. — Lyinnea tentaculata. Flem. Ed. Ency. vii. 78. — 

 Nerita jaculata. Mitl.ler, Verm. ii. 185. — Bitliinia jaoulator. 

 Leach, ^Syn. Moll. 209.; Bisno, Etir. M. iv. 100. — Bitbinia 

 tentaculata. Gray, Man. 93. t. 10. f. VIO. ; Eorbes and 

 Hanley, B.M. iii. 14. t. 71. f. 5. 6. t. H. H. f. 3. — Turbo 

 Janitor. Vull. Ezer. H.N. 6. — Turbo nucleus. Da Costa, 

 t. 5. f. 12. — Paludina tentaculata. Flem. B. A. 315. — 

 Paludina impura, Lam. vi. 175. (List. Conch, t. 132. f. 32.) ; 

 Brard, 183. t. 7. f. 2.; Turtoii, Man. 134 f. 120. — Cyclo- 

 stoma impurum. Drop. 36. t. 1. f. 19. ; Sturm, Fauna, t. vi. 

 3.1. 



YouniT. — Turbo la;vis (?). Walker, f. 33. — Nerita splia2rica. 

 Midler. 



Var. 1. Sborter, less, and more conical. Drap. 1. 1, f. 20. 



In ditches and canals ; common all over Britain. 



Animal blackish, with golden dots ; foot two- 

 lobed in front, narrow and subacute behind; ten- 

 tacle setaceous, long ; the eyes black. 



Shell half an inch long, and three-tenths wide, 

 often covered with a blackish foul coat ; spire com- 

 posed of five volutions, the first very tumid, the 

 others hardly raised ; pillar without umbilicus. 



4. 2. BiTHiNiA ventricosa. Ventricose Bithinia. 



— Shell conic, yellowish horn-colour, smooth, 

 semi-transparent, with five very tumid volu- 

 tions, and a small oblique umbilicus, (t. 10. f. 

 121.) 



Bithinia ventricosa. Gray, M. liep. 1 821, p. 239. ; Man. 94. — 

 Turbo Leachii. Sheppurd, Linn. Trans, xiv. 152. 1822. — 



