VI 
THE NAUTILUS. 
Plaxiphora Suteri Pilsbry, n. sp. 8 
Pleurocera alveare Conrad, variations of ... 82 
Polygyra hirsuta, variations due to station in . 24 
Polygyra hirsuta on Long Island . . . . . 75 
Potamanax, note on . . . . . . . . 131 
Pupa syngensis from Montana ..... 35 
Purpura saxicola Val. ....... 12 
Pyramidula ? Randolphii Dali, n. sp. .... 130 
Rafinesque, the life and writings of . . . . . 119 
Rangia the proper name of the Mactoid genus Gnathodon. 102 
Remarks on the status of species and subspecies . 49 
Shell hunt forty feet under the sea .85 
Shells of Aroostook Co., Maine ...... 125 
Siphonaria sirius Pilsbry, n. sp. ..... 8 
Siphonaria acmaeoides Pilsbry, n. sp. . . . . 16 
Siphonalia Stearnsii Pilsbry, n. sp. . . . . . 31 
Somatogyrus Sargenti Pilsbry, n. sp. ... 102, 105 
Some Arkansas snails ....... 36 
Southern shells in Missouri . . . . . . 18 
Spirula peroni in Jamaica ...... 36 
Spisula Gray ......... 40 
Spisula subtruncata ....... 28 
Tasmanian Acmsea and Ischnochiton, note on . . . 127 
Trachydermon (Cyanoplax) Raymondi Pilsbry, n. sp. . 46 
Trachydermon (Cyanoplax) Raymondi in British Columbia. 27 
Unio ellipsis in the Tennessee River ..... 82 
Unio oregonensis Lea, note on . . . . . 116, 130 
Unio ochraceus and cariosus. (Illustrated). . . 121, 143 
Urosalpinx cinereus in San Francisco Bay ... 13 
Veronicella found in Central America, note on the species of 140 
Veronicella sp. nov. vel. mexicana var. .... 142 
Veronicella sp. nov. vel puntatissima var. .... 143 
Vertigo morsei Sterki, n. sp. ..... 89 
Vivipara georgiana limnothauma Pilsbry, n. var. . . 116 
Zonites cellarius in Western Pennsylvania ... 82 
