INDEX. 
Technical terms are in italics , and will be found explained 
at pages to which references are given. 
A. 
Achatina acicula, 171 ; pulsations of the heart of, 172 ; 
subterranean habits of, ib. 
Acme fusca, 223 ; how to secure, ib. 
Adductor muscles of bivalves, 18. 
Agate snails, 171. 
Air-breathing snails, 65 ; relation of, to water-breathing 
snails, ib.; orders of, ib. 
Alasmodonta margaritifera, 27. 
Amber snails, 174. 
Amphipeplea genus, 186. 
-glutinosa, 196. 
- involuta, 198. 
'Amphistoma subclavatum, parasite of Cyclas , 35. 
Anal opening in bivalves, 14. 
Ancylus genus (fresh-water limpets), 205. 
- fluviatilis, 206 ; respiration in, 207 ; parasite of, 208. 
- lacustris, 208. 
-oblongus, 208. 
Animal kingdom, primary divisions of, 1. 
Annulose animals, 2. 
Anodon anatinus, 31. 
-cygneus, 30; varieties of, 31 ; mite of, 32. 
