Index 



525 



muscular system 15 

 museums as repositories 216 



Nautilinus 202 



Nantilonrmigcr 78 



nepiiridiiun 12 



nervous system 14 



new classification 45 



new genus in this volume 



Pingiella 109 

 new species and varieties listed 218 

 new species in this volume 

 Helisoma columhiensc 222 



kennicotti 223 

 M end us coloradoensis 230 

 dalli 231 

 lab in t us 232 

 portlandcnsis 233 

 Parapholyx pusilla 229 

 Planorbula smithii 229 

 Tropicorbis shimeki 218 

 new subfamily in this volume 



Segmentininae 96 

 new subgenera in this volume 

 Lateorbis 85 

 Micromenetus 187 

 new subgeneric name 



Syrioplonorbis 88 

 new varieties in this \oIume 



Helisoma anceps anticostianutii 219 

 anccps bartschi 219 

 anceps idahoense 220 

 anceps politum 221 

 binneyi randolpki 221 

 campanulalum dalli 226 

 campanulatum pleistocenicuni 226 

 campanidatum rideauense 227 

 caribaeum cubense 222 

 pilsbryi preblei 224 

 subcrenatum perdisjunctum 224 

 trivolvis marshalli 225 

 Menetus coopcri crassilnbris 230 

 cooperi planospirus 231 

 dilatatus floridensis 232 

 Parapholyx effusa dalli 227 

 klamathensis sinitsini 228 

 nidamental gland 6 

 nidification 25 



Obstruclio 47, 48, 85 

 Odontogyrorbis 48, 64 

 oesophagus 9 

 Oncomelania 21 

 orientation of shell 15, 50 

 o\iduct 5 



ovisperm duct 5, 6 

 ovotestis 6 



Palaeorbis 202 

 Parapholyx 47, 49, 161 



effusa dalli, n. var. 227 



klatnathensis sinitsiiii, n. var. 228 



pusilla, n. sp. 229 



Paraplanorbis 49, 119 

 parasitic worms 21 

 pedal ganglion 14 

 penial complex 4, 7 



gland 8 



gland duct 5 

 penis 7 

 perdisjunctum, Helisoma subcrenatum, 



n. var. 224 

 pericardium 13 

 periostracum 16 

 Perrinilla 160 

 P/ii/.sa 22 

 Physopsis 21, 50 

 Pierosorna 47, 49, 134 

 pilasters 7 



Pilsbry ix, 11, 45, 196 

 Pingiella, n. gen. 22, 47. 49, 109 

 Planorbarius 47, 49, 166 

 Planorbella 47, 49, 150 

 Planorbidae ix, 3, 17, 21, 37, 41, 45, 48 



as hosts 21 

 Planorbijex 49. 190 

 Planorbinae 50 



kev to genera of, 46 

 Planorbis 22, 46, 48. 50, 51 

 Planorbula 17, 48, 49. 172 



smithii, n. sp. 229 

 Planorbulinae 172 



key to genera of, 48 

 planospirus, Menetus cooperi, n. var. 231 

 Platytaphius 49, 120 

 pleistocenicutn, Helisoma campanulatum, 



n. var. 226 

 pleural ganglia 14 

 pneimiostome 3, 14 

 Poecilospira 49, 194 

 politum, Helisoma anceps, n. var. 221 

 Polypylis 22, 47, 49, 104 

 Pompholopsis 49, 165 

 portlandcnsis, Menetus, n. sp. 233 

 Potamogcton 19 



preblei, Helisoma pilsbryi, n. var. 224 

 prei)utiinn 4, 7 

 Promenetus 48, 49, 178 

 prostate 5 



pseudobranch 3, 14, 50, 196 

 Pseudosuccinea 22 

 publications of F. C. Baker xxv 

 imlmonary siphon 14 

 pusilla, Parapholyx, n. sji. 229 

 P3'loris 9 



Radix 22 



radula 11, 50 



randolphi, Helisoma binneyi, n. var. 221 



receptacukun seminis 6 



rectum 9 



rediae 21 



renal organ 12 



rejiositories of specimens 216 



