INDEX TO TEXT 



Since in the text of this volume all anatomical features, synonymy, distri- 

 bution, and lists of valid species are treated in full for each genus and 

 subgenus, references to these details are not cited in the index. Similarly, 

 the inclusion of all taxonomic names, morphological terms, and names of 

 authorities where these api^ear in descriptions and comparisons would ex- 

 tend the size of the index unreasonably without adding value to the reader, 

 hence these items are likewise omitted. A list of the more important 

 synonyms is conveniently available in the text in a chronological list fol- 

 lowing the heading for each group; consequently these names are not 

 repeated in the index. 



For each scientific name the chief reference to the full taxonomic and 

 morphological treatment is cited in boldface type. 



To avoid confusion of numerals for page, plate, and figure numbers, a 

 separate index to the illustrations has been prepared wherein all figures 

 are listed under the respective generic and specific names used in the 

 explanation of the plates. 



abdominal ganglia 14 



accessory cusps 11 



acknowledgments ix 



Acrorbis 47, 49, 121 



affinities uncertain 192 



Ajroplanorbis 21, 46, 48, 86 



Aguayo 22 



albumen gland 6 



anatomical kej's 46 



anatomy, internal 4 



Andrews 25 



Anisopsis 48, 94 



Anisus 9, 46, 48, 55 



anticostianum, Helisoma anceps, n. var. 



219 

 aorta 13 



Armiger 46, 48, 75 

 arteries 13 

 arterioles 13 

 Atropoarmiger 78 

 auricle 13 



Australorbis 21, 46, 48, 90 

 autofecundation 29 



Baker, Frank Collins 



biographical contributions xxxv 



book notices and reviews xxxv 



memorial to xvii 



scientific jniblications xxv 

 barli^chi, Hdinonin n7iceps, n. var. 219 

 Bnthyoniphaln.-i 46, 48, 62 

 bibliography' 204 

 biographical sketch xvii 

 Biomphalaria 48, 89 

 blood flukes 21 

 blood sinuses 13 

 Boycott 29 

 buccal ganglia 14 

 buccal sac 9 

 Bulinidae 196 

 Bulinus 21, 50, 196 



callus 15 

 Campelonn 29 

 Carinifex 47, 49, 154 

 carrefour 6 

 Castalia 19 

 central tooth 11 

 cephalic artery 13 

 cercariae 21 

 cerebral ganglia 14 

 Chadwick 29 

 Choanomphalus 49, 192 

 circulatorv system 13 

 Clapp 7 ' 

 classification, 



history of 41 



new 45 

 Clonorchis 21 

 color of shell 16 



coloradocnsis, Menetus, n. sp. 230 

 Colton 29 



columbicnsc, Helisoma, n. sp. 222 

 costae 16 

 Costorbis 48. 61 

 Crabb 7, 27, 29, 30, 31 

 crassilabris, Menetus coopcri, n. var. 230 

 Cristonrmigcr 78 

 crop 9 



crystalline style 10 



cubense, Helisoma caribaeum, n. var. 222 

 cusps, accessory 11 



central 11 



dalU, Helisoma cainpanulotum, n. var. 

 226 



Menetus, n. sp. 231 



Parapholyx ejfusa, n. var. 227 

 development 25 

 dextral 3 

 diaphragm 7 

 digestive sj'stem 9 



523 



