EXPLANATION OF PLATES. 125 
Sub-genera. De Fer- 
FIG. 
288 Polyphemus Glans, Montf........... Cochlicopa. 
289 Bulinus decollatus; a, ina young state, Cochlicella. 
290 Azeca tridens, Jeffreys, Turbo tridens, | 
; Cochlogena. 
Gmelin, J 
291 Pupa Uva, >} 
292 Alea marginata, Jeffreys, “ 
Ges Vertigo pusilla. Porceteees Cochlodonta. 
294 Megaspira Ruschenbergiana, J 
295 Clausilia Macascarensis; a, bro- 
ken to show theclausium, >..... . Cochlodina. 
poo balea tragmis, cic nec aes +s 
297 Auricula Jude. 
298 coniformis. Conovulus, Lam. Melampus, 
Montf. 
299 Pedipes Adansoni. 
299* Scarabzeus imbrium. 
300 Chilina Dombeyana. 
301 Carychium minimum. 
302 Partula Australis. 
303 Cyclostoma ferrugineum. 
304 Involvulus. Cyclophorus, Montf. 
305 Nematura Deltz. Sow. 
306 Helicina major. 
307 Operculum of the same. 
Fam. Lymneana. 
308 Limnea Stagnalis. 
309 auricularia; Radix, Montf. 
310 castanea. Physa, Lam. 
311 Planorbis corneus. 
312 Planaria nitens. (from Lea.) 
Fam. Melaniana. 
313 Melania subulata. 
314 Anculosa, preerosa et monodontoides. Say. 
315 Melanopsis costata. 
316 Pirena terebralis. 
317 Pasitheea striata, (from Lea.) 
Fam. Peristomata. 
318 Ampullaria fasciata. a, aperture. 
319 —————_—_ Gu inaica. Lanites, Montf. 
320 Cornu-arietis. 
32] Paludina Bengalensis. 
