INDEX. 



iGl 



Planorhis intermedins, 105 

 lautus, 123 

 lens, 128, 126 

 lenticularis, 127 

 lentus, 104, 117 

 liebmanni, 108 

 macrostomus, 119, 116 

 megastoma, 118, 116 

 mexicanus, 113 

 inultivolvis. 111 

 nebrascensis, 136 

 newherryi, 75 

 niger, 135 

 obliguus, 130 

 obtusa, 135 

 opercularis, 125 

 parallelus, 135 

 parvus, 133 

 planoconvexus, 136 

 planulatus, 126 

 proboscideus, 119, 116 

 regularis, 117, 116 

 spectabilis, 136 

 spiroi'bis, 135 

 subcarinatus, 135 

 subcrenatus, 103 

 subdistortus, 135 

 subu7nbilicatus, 136 

 tthiagJophilus, 107 

 tenuis, 113 

 terverianus, 107 

 <ras^n, 113, 112 

 trivolvis, 115, 117 

 truncatus, 121 

 turuens, 106 

 tumidus, 105 

 utahensis, 136 

 vermicularis, 128 

 vetulus, 136 

 rj'rens, 129 



Planorbis vilrinus, 136 



wheatleyi, 135, 137 

 Planorbula, 136 

 Pompholyx, 73 

 Pompholyx effusa, 74 

 Puj[)a exigua, 7 



Radix, 30 



Segmentaria, 136 



Segmentina, 136 



Segmentina armigera, 137 

 wheatleyi, 136 



Siphonaria, 152 



Siphonaria sequilirata, 153 

 alternata, 153 

 amara, 154 

 lecanium, 154 

 palmata, 154 



Siphonariidse, 152 



Stagnicola, 25, 38 



Thalassophila, 152 

 T'iriiatelle coniforme, 14 

 Tornatellina cubensis, 21 

 Tralia, 16 

 Tralia cingulata, 18 



floridana, 16 



pusilla, 17 



Valvata subnmbilicata, 136 

 Velletia, 147 

 Velletia nuttallii, 147 

 Velutina zmiata, 22 

 Valuta cojfea, 14 



Jlammea, 13 



flava, 13 



minuta, 14 



pusilla, 17 

 triplicata, 17 



