142 THE NAUTILUS. 



Africa. I hope to be able to contribute to the solution of the first 

 question in the future, since the Carnegie Mrseum recently has re- 

 ceived a good deal of alcoholic material of South American Unionidce^ 

 M'hich is waitinjr for identification and examination. 



NEW SPECIES OF SPHAERIIDAE. 



BY V. STERKI. 



SphcErium lincatum, n. sp. 



Mussel somewhat elongate, inequipartite, well inflated ; beaks 

 somewhat anterior, rather large, full, rounded, projecting over the 

 hinge margin ; superior and inferior margins moderately and regu- 

 larly curved, anterior and posterior subtruncate-rounded, oblique ; 

 scutum and scutellum distinctly marked, narrow ; surface dullish 

 with a slight silky glass, with the concentric striie (sulci) fine, sharp, 

 crowded, regular, and several (3 or 4 to 7) strongly marked, dark 

 lines of growth ; color grayish-horn to reddish, the latter prevalent 

 on the beaks and upper part of older specimens ; shell rather thin, 

 hinge slight, long, plate narrow ; cardinal teeth small; slight, short, 

 the right curved or angular, emarginate, its posterior part bifid, the 

 left anterior rudimentary or wanting in some specimens;' ligament 

 long, slight covered. 



Long. 15.0, alt. 11.5, diam. 8. mill. (Turkey Lake). 



Long. 14, alt. 10.5, diam. 8. 5 mill. (Wetherby). 



Soft parts not seen. 



Hab.: Turkey Lake, Kosciusko Co., Luliana, collected by Mr. L. 

 E. Daniels, of the Indiana Geological Survey, in 1902. 



A Sph. from Mountain Lake, Marquette Co., Michigan (Upper 

 Peninsula), collected by Mr. Bryant Walker, in 1898, and sent for 

 examination then, appeared to be of the same species. The mussel 

 is somewhat smaller, with the beaks slightly more anterior, the in- 

 ferior margin less curved and the infero-posterior angle somewhat 

 more marked. These Sphseria, although well represented by good 

 specimens of various stages of growth, and regarded as distinct, were 

 shelved for years, in the hope of getting additional material. Lately 

 Mr. Bryant Walker kindly sent me a lot of the Wetherby collection, 

 which unfortunately has no label. Although such specimens should 



*As occasionally found also in other species. 



