35 



B. — Freshwaiet Univalves. 



12 



87 Valvata tricarinata, Say. 

 8S " sincera, Say. 



89 " pupoidea, Gould. 



90 " virens, Tryon. 



91 Campeloma decisum, Say. 



92 Bythinia tentaculata, L. 



93 Bythinella obtusa, Lea. 



94 Somatogyrus de[)ressus,,Tryon. 126 



95 " isogonus, Say. 127 



96 Amnicola porata, Say. 128 



97 " pallida, Hald. 



98 " limosa, Say. 



119 Limntea humilis, Say. 



120 " lanceata, Gould. 



121 " gracilis, Jay. 



122 Physa Lordi, Baird. 



124 

 125 



" gyrina, Say. 



" triticea, Lea. 



" ampuUacea, Gould. 



" ancillana. Say. 



" Billingsii, Heron. 



" heterostropha, Say. 



129 Bulinus hypnorum, L. 



130 Planorbis corpulentus, Say. 



Cincinatiensis,Anth. 131 



132 



99 

 100 " granum. Say. 



loi Fluminicola Nuttalliana, Lea 



102 Pomatiopsis lapidaria, Hald. 



103 " lustrica, Say. 



104 Plurocera subulare, Lea. 



105 Goniobasis livescens, Menke. 136 



106 " salicula, Gould. 137 



107 Limnaea stagnalis, L. 



108 " ampla, Mighels. 



109 " decollata, Mighels. 

 no " columella. Say. 



111 " lepida, Gould. 



112 " megasoma, Say. 



113 " palustris, Miill. 



114 " catascopium, Say. 



115 " emarginata, Say. 145 



116 " caperata. Say. 146 



117 " decidiosa, Say. 147 



118 '■ Adelinje, Tryon. 14S 



C. — Land Shells. 



149 Selenites concava. Say. 151 Selenites sportella, Gould. 



150 " Vancouverensis,Lea. 152 Liniax agrestis, Miill. 



" trivolvis. Say. 



" macrostomus, Whit- 



eaves. 

 " bicarinatus. Say. 



" campanulatus, Say. 



" opercularis, Gould. 



" exacutus, Say. 



" deflectus. Say. 



albus, Miill. 

 " nautileus, L. 



'' parvus, Say. 



" umbilicatus, J. W. 



Faylor. 

 " Billingsii, Lea. 



143 Segmentina armigera, Say. 



144 Ancylus parallelus, Hald. 



133 

 134 

 135 



138 



139 

 140 



141 

 142 



rivularis. Say. 

 caurinus, Cooper, 

 fragilis, Tryon. 

 Koocaniensis, Baird. 



