INDEX 



TO 



THE NAUTILUS, VOL. XIX. 



INDEX TO SUBJECTS, GENERA AND SPECIES. 



16) 



Achatina gracilior Boettger 

 Achatinellidse, descriptions of new species of 

 Alaba oldroydi Dall, n. sp. . 

 Adelomelon Dall ..... 



Amastra conica Baldwin 



Amastra lseva Baldwin .... 



Amastra montana Baldwin . 

 Amastra rubristoma Baldwin 

 Amastra seminuda Baldwin 

 Amastra sinistrorsa Baldwin 

 Amoria Gray ..... 



Amnicola augnstina Pilsbry (PI. V, figs. 13, 14) 

 Amnicola pilsbryi Walker, n. sp. (PI. V, figs. 11 

 Amnicola walkeri Pils. (PI. V, fig. 12) 

 Amnicolidae, new and little known species of 

 Antarctic nudibrancbs ..... 



Arion subfusca var. cinereofusca. 



Arizona and New Mexico, the snails of 



Bifidaria pentodon and its allies. 



Bifidaria pentodon Say (Plates YI and YII, figs 



Bifidaria pentodon var. gracilis Sterki (PI. VI, figs. 16- 



Bifidaria tappaniana C. B. Adams (PI. VII, figs. 42-53) 



Bifidaria tappaniana curta Sterki .... 



Calilornian helix, a new ...... 



Californian shells, two undescribed .... 



Calliostoma (Leiotrochus) marionae Dall, n. sp. . 

 Carychium exiguum Say (figs.) ..... 



Carychium exile Lea (figs.) 



(Hi) 



1-41) 



07 



121 



2*0 



96 



111 



15 



143 



1ST 



138 



136 



137 



137 



138 



143 



117 



116 



117 



114 



71 



84 



63 



134 



122 



123 



126 



134 



41 



14 



131 



140 



138 



