VI THE NAUTILUS. 



Pisidium planatum Ancey 46 



Pisidium proximum Sterki, n. sp. . 5 



Pisidium subrotundum Sterki, n. sp. . 19 



Pisidium succineum Sterki, n. sp 99 



Pisidium superior Sterki, n. sp 98 



Pi tar (Hysteroeoncha) dione 2 



Plejona, Bolten 130, 143 



Pleurotoma (Genota) carp enteri ana Gabb (PI. II, figs. 



1-3) . . . . . .37 



Pleurotoma (Genota) cooperi Arnold (PI. II, fig. 10). . 38 

 Pleurotoma (Genota) riversiana Raymond (PI. II, fig. 9). 39 

 Pleurotoma (Genota) stearnsiana Raymond (PI. II, figs. 



4-6) . ' . 38 



Pleurotoma (Genota) tryoniana Gabb (PI. II, figs. 7, 8). 38 

 Pleurotoma, the West American species of ... 37 

 Polygyra (Stenotrema) brevipila Clapp, n. sp. (PI. V, 



fig. 1-4) ... .110 



Polygyra^ ( Stenotrema) altispira P&lsbry (PH. V, figs. 5-7) . Ill 



Pomatiopsis Winkleyi Pilsbry 43 



Popular conchology 71 



Praticolella jejuna Say 33, 46 



Pseudopartula, note on . . . , . .47 



Psilocochlis Dall, note on the genus 128 



Psilocochlis mccalliei Dall 128 



Publications received . 11, 36, 47, 71, 84, 96, 106, 119, 143 



Quadrula trapezoides Lea. 68 



Ravenel 'collection 36 



Richfield Springs, New York, shells of . . . .89 



Scala berryi Dall, n. sp 127 



Scala (Cerostrema) montereyensis Dall, n. sp. . . 128 

 Scala from California, three new species of . . . 127 



Scala lowei Dall, n. sp. 44 



Scala rectilaminata Dall, n. sp. 127 



Scallops, migrations of 83 



Segmentina armigera Say (PI. VII, figs. 1-3). . . 123 

 Segmentina crassilabris Walker, n. sp. (PI. VII, figs. 4-6). 122 

 Segmentina wheatleyi Lea (PI. VII, figs. 7-9). . . 123 

 Sitala, a new Chinese 5 



