vi THE NAUTILUS. 
Potamolithus microthauma n. sp. . 
Potamolithus Orbignyi, n. sp. 
Potamolithus Rushii Pils., n.sp. . 
Potamolithus Sykesii,n. sp. . 
Pseudopartula Pfr. ‘ 
Puget Sound, notes on some shell han 
Punctum conspectum var. pasadenz Pilsbry, n. var. . 
Pupa, a new form of . 
Purpura lapillus var. umbricata . 
Pyramidula strigosa, young . 
Schmacker B. (obituary) . 
Shells of Maryland . 
Sinistral land shells . 
Snailery, my . 
Some land shells of Wivakiean 
Sphaeria, a word about . 
88, 89 
Sphyradium (Pupa) edentulum Dee ihe eyienanee posi- 
tion of . 
Sulcobasis, anatomy of . 
Synapterpes, n. gen. : 
Trachydermon Sharpii alter: n. sp. 
Tray of shells from Denmark . 
Unionide, descent and distribution of . 
Unio Askewi Marsh, n. sp., pl. I, figs. 3, 4 
Unio Brimleyi Wright, n. sp. 
Unio Burtchianus Wright, n. sp. . 
Unio Kirklandianus Wright, n. sp. 
Unio Lehmanii Wright, n. sp. 
Unios, the muscle scars of . 
Unio Pinkstonii Wright, n. sp. : 
Unio superioriensis Marsh, n. sp., e I; hes 1, 2, a4 
Unios of Illinois River . 
United States Unionide, contrihune ‘oF a nowhere a 
Vallonia pulchella in Pittsburgh. . . 
Van Nostrand, Henry D. (obituary) . 
Vertigo coloradensis and its allies . 
Vitrea cellaria Mull., notes on . 
Weight and size of shells . 
Zonites glaber Stud. and Zonites noida Dio in green- 
houses, Seattle, W ashington . 
91, 121 
103, 121 
