Subjani'dies, Genera, and Suhgeuera — Recent and Fossil 71 



Species of Fiji Group 



singularis Mousson 

 Species of New Caledonia 



montrouzieri Gassies 



Species of 



associatus Westerlmui 

 ocutua Clessin 

 barrakporensis Clessin 

 cnntori Benson 

 cherraeiisis Godwin- Austen 

 compressus Hut ton 

 convexiusculus Hutton 

 demissus Westerlund 

 elegantulus Dohrn 

 euphraticibs Mousson 

 himlayaensis Hutton 

 hohcnachcri Clessin 

 haltoni Benson 

 hiiptiocyclos Benson 

 injraUneatus Martens 

 intcrmixtus Mousson 

 issykulensis Clessin 



i-us-siteri Crosse 



India and Asia 



labiatus Benson 



laidocensis Nevill 



liratus Westerlund 



nialacaensis Germain 



pangongensis Nevill 



proclivis Martens 



rotuln Benson 



saigonensis Crosse and Fischer 



saltensis Germain 



sivalensis Hutton 



stelzneri Dohrn 



stewarti Germain 



sumatranus Martens 



tondanensis Quoy and Gaimard 



velijer Annandale 



yeni Ping and Yen 



Species of Japan 



amplificaius Mori 

 biwaensis Preston 

 hiemantium Westerlund 

 infirmus Mori 

 iwaotakii Mori 



Species of the Philippines 



?)titidanensis Bartsch quadrasi Mollendorff 



japonicus Martens 

 noziriensis Mori 

 pulcher Mori 

 tokyoensis Mori 



Species of America 



arcticioi (Beck in Moller) 

 boetzked (Miller) 

 burealis Lo\'en 

 cyclostomus F. C. Baker 

 dcflectus (Say) 



deflectus obliquus (De Kay) 

 hirsutus (Gould) 

 hornensis F. C. Baker 

 Intistoiinis F. C. Baker 



Geological Distribution. According to Wenz the genus Gyraulus dates 

 geologically from the Middle Eocene period. 



Remarks. The genus Gyraulus is closely related to Anisus in its ana- 

 tomical features, especially the genitalia. In fact, Gyraidus, A7iisus, and 

 Bathyomphalus form a natural group, based on their anatomy, particularly 

 in the presence of a horny stylet on the verge. The shells of Anisus and 

 Gyraulus, however, are quite unlike and the genera should undoubtedly 

 be separated on conchological grounds alone. 



]\Iore than ninety species of Gyraulus are listed on the previous pages 

 (excluding those from America). Some of these may be found to belong in 

 other genera, when examined anatomically. Also, it is probable that several 

 additional species should be added to those listed. Completeness is not 

 claimed. All of those listed have been included in the genus Gyraulus by 

 competent conchologists. 



