APLEXUS. 229 



shell is longer, and the inner lip parallel to the 

 outer, and not spread over the body whorl. 



Adanson first described this genus in 1757, under 

 the name of Bulin (Bulinus), which ought to be 

 adopted ; but it would create confusion, as Hartmann 

 and Mr. Broderip have lately changed Lamarck's 

 genus Bulimus, which is synonymous with Cochlea 

 of Adanson, into Bulinus. 



102. 1. Aplexus lixj-pnorum. Slender Aplexus. — Shell 

 horn-colour, oblong, with an elongate pointed 

 spire; aperture oval-lanceolate, (t. 9. f. 113.) 



Bulla hypnorum. Linn. S. N. i. 1182, ; Mont. p. 228. — Buli- 

 mus hypnorum. Brug. Ency. Meth. 301. — Planorbis 

 turritus. Miiller, Verm. ii. 169. — Physa hypnorum. Drop. 

 Hist. p. 55. t. 3. f. 12, 13.; Turton, Man. ed. 1. 129. f. 113.; 

 Forbes and Hanley, B. M. iv. 143. t. 122. f. 6, 7. — Bulla 

 rivalis. Flem. Ed. Ency. vii. 85. — Limnea turrita. Gray, 

 in Sotverby, Gen. f. 10. — Nauta hypnorum. Leach, Syn. 

 Moll. 110.— Helix marmorata. Gmel. S. N. 3G65.— Aplexa 

 hypnorum. Fleming, B. A. 276. — Aplexus hypnorum. 

 Gray, Man. 255. 



In ponds and slow streams. 



Animal blackish ; foot quite as long as the shell ; 

 tentacles black. 



Shell half an inch long, and a third part as broad, 

 dark horn-colour, glossy and transparent ; spire com- 

 posed of five or six produced and hardly raised volu- 

 tions, ending rather acutely ; aperture narrow-oval, 

 covering about half the shell ; the pillar a little sinu- 

 ate, often of a pale rose-colour. 



The eggs are deposited in oblong masses exactly 



similar to those of Limnceus, slightly attached to shells 



and water-plants. (See Pfeiffer, t. 7. f. 24. 27.) 

 Q 3 



