THE NAUTILUS. 



vii 



var 



of 



Sitala hangchowensis Pils., n. sp. 



Sphaerium from Illinois, a new 



Sphaerium hendersoni Sterki, n. sp 



Sphaerium, on the pathology of 



Sphaerium solidulum 



Sphaerium stamineum forbesi Baker, n. var. 



Stenotrema altispira Pilsbry (PI. V, figs. 5-7) 



Stenotrema brevipila Clapp, n. sp. (PI. V, figs 



Stenotrema from Alabama, new species of 



Strigilla carnaria 



Subspecies, mutations and forms 



Tellina (Eurytellina) angulosa. 



Tivela mactroides 



Tomogeres Montf . 



Tonicella blaneyi Dall 



Tonicella ruber var. index Balch, n 



Trachydermon ruber. 



Unionidae, some observations on the ova 



Unionidae of Kansas. 



Valvata bicarinata Lea (PI. I, fig.14) 



Valvata bicarinata connectans Walker, n 



Valvata bicarinata perdepressa Walker, 



figs. 15-16) 



Valvata, notes on ... 



Valvata lewisii Currier (PI. I, figs. 12-13 



Valvata sincera danielsi Walker, n. var. (PI 



11) 



Valvata sincera Say (PI. I, figs. 1-6) 

 Valvata sincera nylanderi Dall (PI. I, figs. 7-9 

 Vitrea approxima and V. vanattai, note on 

 Vitrea (Paravitrea) aldrichiana Clapp, n. sp. ( 



8-11) 



Volutidae, a review of the American 

 Ward, Henry A. (obituary) 

 Winkley collection of shells 

 Wisconsin shells, list of . 

 Zonitoides alliaria in Colorado. 



1-4). 



var. 

 n. var. (PL I, 



I, figs. 10, 



5 



. 21 

 . 69 

 . 11 

 . 11 

 . 21 

 . Ill 

 . 110 

 . 109 



1 

 . 58 



1 

 . 3 

 . 11 

 62, 65 

 . 66 

 . 62 

 . 68 

 . 144 

 . 29 

 . 30 



) • • 

 PI. V, figs. 



30 

 25 

 29 



28 

 26 

 28 

 57 



. 109 

 129, 142 



. 48 

 . 118 

 . 22 

 . 144 



