252 



Plate -Txv. Upper figure. Sigaretus perspectitus. 

 " Lower " " " 



Middle " 



XXVI. 



xxvii. 



.•CXVlll. 



XXIX. 



Upper " 

 Lower right 

 Lower left 



maculatus. 

 Yenus grata, 

 scalaria clathrus, l. 

 " multistriata. 



" LINEATA. 



Middle figure. Amphidesma transverscm. 

 Exterior " " .equale. 



Middle " Fusus corneus, L. 

 Exterior " " cinereus. 



XXX. figure 1. Pai.udina ponderosa. 



" 2. " subpurpurea. 



" 3. " intertexta. 



xxxi. to Ixviii. are lettered. 



(From Nicholson's Encyol.) 



Helix albolabris. 



" alternata. 



" glaphyra. 

 Planorbis BICARINATUS. 



" PARVUS. 



(Lymn^a) Physa hetkrostropha. 

 Paludina subcarinata. 

 Unio crassus. 

 Cyclas similis. 



" DUBIA. 



Helix tridentata. 

 Planorbis trivolvis. 

 Ltmn^a catascopium. 

 (Paludina) Melania virqinica. 

 Paludina vivipara, L. 



" DECISA. 



Unio ovatus. 

 " ochraceus. 

 " purpureus. 

 " cariosus. 

 Alasmodonta undulata. 

 Anodonta cataracta. 

 " marginata. 



" undulata. 



Unio nasutus. 



" ALATUS. 



" CYLINDRICUS. 



Helix arboreus. 

 Pupa cortioaria. 



(From Long's Exp.) 



Ixxiii., Ixiv. have the names of the figures. 



{From a copper plate prepared by Mr. Say, but never publishRd . 



Ixxv. Ampullaria rotundata, {teste Haldem an.) 



