116 
INDEX. 
Buttmus, montanus, 76, vii, 8. 
obscurus, 76, vil, 9. 
BytTHINIA, 25. 
Leachii, 25, ii, 8. 
tentaculata, 25, ii, 7. 
CaRYCHIIDA, 95. 
CarycHium, 95. 
minimum, 95, vil, 9. 
Cravsinia, 88. 
biplicata, 90, viii, 4. 
laminata, 91, viii, 3. 
parvula, 92. 
Rolphii, 99, viii, 2. 
rugosa, 89, viu, 1. 
solida, 92. 
CocHuicopa, 92. 
lubrica, 93, vii, 6. 
tridens, 92, viii, 7. 
CONCHIFERA, 13. 
CycLostoma, 96. 
elegans, 96, vii, 10. 
CyYcLOSTOMATIDA, 96. 
DreissEena, 22. 
polymorpha, 22, u, 3. 
DReEISSENIDA, 22. 
GASTEROPODA, 23. 
Gromatcus, 44. 
maculosus, 44. 
Heuicipa, 49. 
He xix, 59. 
aculeata, 59, v, 16. 
