VI THE NAUTILUS. 



Pyramidula rupestris in Maine 58 



Pyramidnla rupestris var. nylanderi Morse, n var. (fig. 1) 59 



Pyramidnla shimekii Pils 63 



Razor shell, the leaping 95 



Schasicheila walkeri Hinkley, n. sp 53 



Schizoplax multicolor Ball, u. sp 22 



Siphonaria japonica (Don.) 141 



Solen ensis L 96 



Sowerby, George Brettingham 137 



Spisula solidissima 59 



Strobilops strebeli guatemalensis Hinkley, n. subsp 52 



Succinea retusa Lea 10, 28, 62 



Tapes philippinarum in the Hawaiian Islands 107 



Tegula hemphilli Oldroyd, n. sp 115 



Thysanophora homi 13 



Tornatina tumida Oldroyd, n. sp 116 



Turritidae vs. Turridae 27, 57 



Vallonia gracilicostata Reinh 14 



Valvata lewisii helicoidea Dall 68 



Venus stutzeri Don 141 



Vermetus nodosus Oldroyd, n. sp 116 



Vertigo modesta insculpta Pils 14 



Vitrina alaskana Dall 14 



Viviparus waltoni Tryon 31 



Wilder, William 101 



Zioii National Park, shells of 140 



Zonitoides alachuana Dall 14 



Zonitoides nummus Van. in Indiana . 70 



