30 
VIVIPAEID^. 
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- 
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.). 
Paludina crystallina, 
b, operculum. 
Fig. 6. 
Teeth of Paludina vivipara. 
a, central ; b, c, c?, 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. Schi'oet 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. ; 
