526 



The Molluscan Family Planorbidae 



reproductive system 4 



respiratory system 14 



rideaucnse, Helisoma campanulalum, n. 



var. 227 

 Rothschild 24 



saHvary glands 9 



sarcobekmi 8 



Schistosoma 21 



sculpture 16 



Segmentina 22, 47. 48, 96 



Segmentininae, key to genera of, 47 



new subfamily 96 

 self fertilization 29 

 seminal vesicle 5 

 Seminolina 47, 49, 129 

 shell 15, 50 



shimeki, Tropicorbis, n. sp. 218 

 Simroth 5 

 sinistral 3 

 sinitsini, Parapholyx klamathensis, n. var. 



228 

 sinuses 13 



siphon, pulmonary, 14 

 size of shell 15 



smithii, Planorbula, n. sp. 229 

 species, dispersal of, 39 

 new in this volume 218 

 Helisoma coliimbieiise 222 



kennicotti 223 

 Menetus coloradocnsis 233 

 dalli 231 

 labia t us 232 

 portlandensis 233 

 Parapholyx pusiUa 229 

 Planorbula smithii 229 

 Tropic.orbis shitncki 218 

 specimens figured, repositories of, 216 

 sperm duct 5 

 spermatheca 6 

 spermatophore 6 



gland 8 

 spermatozoa 7 

 sporocysts 21 

 Stagnicola 22 

 Sterki 11, 19 

 stomach 9 

 style, crystalline, 10 

 stylet 7 

 stylotheca 10 



subfamily new in this volume 

 Segmentininae 96 



subgenera new in this volume 



Lateorbis 85 



Micromenelus 187 

 subgeneric name new in this volume 



Syrioplanorbis 88 

 Syrioplanorbis, new name 48, 88 

 systematic account 50 



list 48 



Taphius 48, 79 

 Taylor 5, 6 

 tentacles 3 

 Torquis 46, 48, 72 

 trematode worms 21 

 trivolvis, species allied to, 138 

 Trochorbis 108 



Tropicorbis 17, 21, 46, 47, 48, 49, 80 

 shimeki, n. sp. 218 



umbilicus 50 



uncertain affinities 192 

 ureter 12 

 uterus 6 



vagina 6 

 Van Cleave 29 

 variations 18 

 varieties, new 218 

 Helisoma ajiceps anticostianum 219 



anceps bartschi 219 



anceps polituvi 221 



binneyi randolphi 221 



campanulatum dalli 226 



campanulatum, pleistocenicum 226 



campamdatum rideaucnse 227 



caribaeum cubensc 222 



pilsbryi prcblei 224 



subcrenatum perdisjunctum, 224 

 Menetus cooperi planospirus 231 



dilatatus floriden.vs 232 

 Parapholyx effusa dalli 227 



klamathensis sinitsini 228 

 vas deferens 4 

 velum 3 

 ventricle 13 

 verge 7 



vergic sac 4, 7 

 visceral artery 13 



ganglia 14 

 Vorticijex 49, 159 



Ward 22 

 Wenz 37 



Wesenburg-Lund 24 

 worms, parasitic, 21 



