INDEX 



TO 



THE NAUTILUS, VOL. XIX. 



INDEX TO SUBJECTS, GENERA AND SPECIES. 



Achatina gracilior Boettger ...... 96 



Achatinollidae, descriptions of new species of . . . Ill 

 Alaba oldroydi Dall, n. sp. . . . . . . .15 



Adelomelon Dall .....'.... 143 



Amastra conica Baldwin ....... 1ST 



Amastra laeva Baldwin . . . . . . . .138 



Amastra montana Baldwin ....... 136 



Amastra rnbristoma Baldwin ...... 137 



Amastra seminnda Baldwin ...... 137 



Amastra sinistrorsa Baldwin . . . . . .138 



Amoria Gray 143 



Amnicola augustina Pilsbry (PI. V, figs. 13, 14) . . lit 



Amnicola pilsbryi Walker, n. sp. (PI. V, figs. 11, 16) . 116 



Amnicola walkeri Pils. (PI. Y, fig. 12) .... 117 



Amnicoltdse, new and little known species of . . 97, 114 

 Antarctic nudibrancbs . . . . . . . .71 



Arion subfusca var. cinereofusca. ..... 84 



Arizona and New Mexico, the snails of . . . .68 



Bifidaria pentodon and its allies. .... 121, 134 



Bifidaria pentodon Say (Plates VI and VII, figs. 1-41) . 122 

 Bifidaria pentodon var. gracilis Sterki (PI. VI, figs. 16-27) 123 

 Bifidaria tappaniana C. B. Adams (PL VII, figs. 42-53) . 126 



Bifidaria tappaniana curta Sterki 134 



California!) helix, a new . . . . . . .41 



Californian shells, two undescribed 14 



Calliostoma (Leiotrochus) marionae Dall, n. sp. . . . 131 



Carychium exiguum Say (figs.) ...... 140 



Carychium exile Lea (figs.) 138 



(Hi) 



