VI THE NAUTILUS. 



Solariidse, description of two new Eocene 1 



Solarium. elaboration Cour. var. bimixta Aldr. n. v:ir. (P). 



I, figs- 1,2, 3) . 1 



Solarium plauiforme Aldr. n. sp. (PL I, figs. 4, 5, 6) . . 



Sora caught by a Mussel. (Illustrated) 49 



Sphieria, on certain abnormal 135 



Sphserium Primeanum, S. Raymondi, etc 98 



Study of fossil shells 7 



Teinostorna Hidalgoana Pilsbry, n. sp 52 



Thelidoraus aspersa 14 



To conchologists ''~ 



Trochoraorpha fuscata Pease, note on 120 



Unio borealis Gray in Michigan 5 



Unio bursa-pastoris Wright, n. sp. (PI. Ill, figs. 1, 2) . . 133 



Unio ellipsis and U. tenuisimus from Grand Rapids, Mich. 11 



Unio Friersoni Wright, n. sp. (PL ill, figs. 3,4). . . . 134 



Uuios in city reservior (Phila.) 



Unionidse, some notes on the genital organs with reference 



to systematics 



Unios, the size of 1'5 



Unios, new Florida 



Unio Hartwrightii Wright, n. sp. (PL II, figs. 4, 5, 6) . . 121 



Unio Oscari Wright, (PL II, figs. 1, 2, 3) . 



Unionidae, new American 



Vallouia, North American species of 16- 



Visit to a vessel that was loaded with shells . .' . . 



Yitrea Johusoni Dall, n. sp 



Vitriua limpida in Western Pennsylvania . 



With a dredge [Southern California] 71 



