30 



VIVIPAEIDvE. 



J^'9- 5- The lingual band 



is strong, slender, 

 elongate ; teeth la- 

 minar, longitudinal, 

 subovate, apex re- 

 '' curved, the mid- 

 dle lobed, and ob- 

 tusely toothed on 

 each side ; the la- 

 teral teeth nearly simi- 

 lar, slightly curved, api- 

 cal edge denticulated on 

 each side ; the inner shorter and broader, the outer 

 teeth winged on the outer edge (fig. 6.). 



Palud'ma cnjstalVnia. 

 b, operculum. 



Teeth of PahuJina vivipara. 

 a, central ; b, c, d, lateral teeth. 



5. 1. Paludina crystallina. Crystalline Marsh 

 Shell.- — ^ Shell thin, oval, acute, volutions five, 

 much inflated, with three brown bands ; the 

 suture deeply impressed; spire blunt mucro- 

 nate. (t. 10. f. 118.) 



Helix vivipara. ScJirost Flnsse, 3-30. t. 8. f. 2. — Cochlea vivipara. 

 Da Costa, B. C. 81. t. 6. f.2.— Helix vivipara.— Z/.s/. Avg. t, 2. 

 f. 17. ; Petiv. Mus, 8i. u. 814.; Donovan, B.S. iii. t. 87.; 



