30 



VIVIPARID^E. 



fig. 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- 



Paludina crystalline tera l teeth nearly simi- 



6, operculum. 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.). 



Fig. 6. 



Teeth of Paludina vivipara. 

 a, central ; 6, c, <f, 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. Schrcet Flusse, 330. t. 8. f. 2. Cochlea vivipara. 

 Da Costa, B. C. 81. t. 6. f. 2. Helix vivipara. List. Ang. t. 2. 

 f. 17. ; Petiv. Mus. 84. n. 814. ; Donovan, B. S. iii. t. 87. ; 



