INDEX 



TO 



THE NAUTILUS, VOL XX. 



INDEX TO SUBJECTS, GENERA AND SPECIES. 



Abalones and the earthquake 135 



Abal'Ones and the penal code of California . . .85 

 Alabama, some shells of Mississippi and . . 34, 40, 52 

 Amphigyra Pilsbry, n. gen. ...... 49 



Amphigyra alabamensis Pilsbry, n. sp. (PL III, figs. 1, 2). 50 



Anodonta imbeeillis Say 69 



Anostoma, on the generic name 11 



Ashmunella rhyssa Ckll. (PL VIII, figs. 3-5). . . 134 



Ashmunella rhyssa edentata 135 



Ashmunella rhyssa hyporhyssa. ..... 135 



Ashmunella rhyssa townsendi Bartsch (PL VIII, figs. 



1, 2) 133 



Ashmunella, notes on some New Mexican. . . . 133 



Athleta rarispina 131, 142 



Basommatophora, two new American genera of . .49 

 Bifidaria agna Pilsbry & Vanatta (figs. 1, 2, 3) . . 141 



Boreocheton 64 



Brachypodella, a synonym of 47 



British Columbia shells 95 



Brooklyn Conchological Club 89 



(iii) 



