INDEX. 119 
Pisipium, nitidum, 17, i, 8. 
pusillum, 17, 1, 7. 
roseum, 18, 1, 9. 
PLANORBBIS, 28. 
albus, 29, ii, 4. 
carinatus, 31, 11, 8. 
complanatus, 31, i, 9. 
contortus, 33, i, 11. 
corneus, 32, iii, 10. 
dilatatus, 33, 11, 12. 
glaber, 50, ii, 5. 
lineatus, 28, 111, 1. 
Nautileus, 29, iii, 3. 
nitidus, 28, iii, 2. 
spirorbis, 30, 1, 6. 
vortex, 31; 1; 7; 
PULMONOBRANCHIATA, 28. 
Pura, 77. 
marginata, 78, vii, 13. 
ringens, 78, vii, 11. 
secale, 77, vii, 10. 
umbilicata, 78, vii, 12. 
SpPHERIDA, 13. 
SpHERium, 13. 
corneum, 18, i, l. 
lacustre, 14, i, 4. 
ovale, 14, i, 3. 
rivicola, 14, i, 2. 
Succinga, 49. 
elegans, 49, v, 2. 
oblonga, 50, v, 3. 
