:?SS THE PALEONTOLOGY OF MINNESOTA. 



|Slr,i|iliiiini'ii:i ni-:- li-rt -, 



Hudson River deposits under that name. The literature treating of S. neglecta is 

 given below, for the convenience of those having occasion to study this species. 



Formation and locttliti/. Somewhat rare in the Trenton limestone at Minneapolis and Fountain, 

 Minnesota. Common in the Trenton shales at Minneapolis, St. Paul, Cannon Falls, Fountain, Preston, 

 near Caledonia and elsewhere in Minnesota; Decorah and McGregor, Iowa. One of the common species 

 In the "Lower Blue beds" at Mineral Point, l'.e],,it, .lanesville and Green Bay city, Wisconsin. In the 

 Trenton limestone at IMxon and Ihinleith. Illinois; Auburn, Lincoln county, Missouri. In the Black 

 River, and at the top of liirdseye limestone near High Hrid^e, Kentucky. Glade limestone at Lebanon 

 and Lavergne, Tennessee. Trenton limestone at Middleville and elsewhere in New York; at Ottawa 

 and county of Renfrew, Canada. 



Collectors. C. L. Herrick, W. IT. Scofleld, E. O. Ulrich and the writers. 

 Mas. Reg. Nos. 66i>. :M47, :1733. :i7;i4, 6771, 6773, 6795, 8167-8178. 



STKOPHOMENA NEGLECTA James, sp. 



1873. Strophomena filite.rtn MEEK (non Hall) Paleontology of Ohio, vol. i, p. 83, pi. vi, flgs. 5a to 5d. 

 ?1875. Strophomeiia filitexta WHITE. U. S. Geological and Geographical Survey west of the 100th 



Meridian, vol. iv, p. 69, pi. iv, fig. 8. 



1875. Hemipronites filitextus MILLER. Cincinnati Quarterly Journal of Science, vol. ii, p. 43. 

 1881, Streptorhynchus neglecta JAMES. The Paleontologist, no 5, p. 41. 

 1883. Streptorhtfnchus filitextus (partim.) HALL. Second Annual Report New York State Geologist, 



pi. XLII, tigs. 10 and 15 (not flgs. 11-14); pi. xxxix, flgs. 1-7. 

 1892. Strophomma filitexta HALL. Paleontology of New York, vol. viii, pt. i, pi. ixA, flgs. 10 and 15 



(not flgs. 11-14); pi. xiA, flg. 3. 



This species is not known to occur in Minnesota, and is restricted to the Hudson 

 River group. For further remarks see S. incttrvata Shepard. 



Formation and locality. Oxford, Clarksville, Waynesville and elsewhere in southwestern Ohio. 

 Richmond, Versailles and Weisburg, Indiana; Savannah, Illinois; ?Silver City, New Mexico. 



STROPHOMENA XEGLECTA. var. ACUTA, n. rar. 



PLATE XXXI. FIGS. 6 aud 7. 



Shell of moderate size, resupinate, concavo-convex, the postero-lateral angles 

 mucronate and deflected. Hinge-line wider than any part of the shell in front of it; 

 cardinal area in the ventral valve three to four times as wide as that of the dorsal 

 valve and somewhat elevated beyond it; cardinal margins more or less strongly 

 wrinkled, the elevations being directed medially at various angles. Outer margin 

 semi-ovate, narrowly rounding anteriorly, more broadly laterally, and terminating 

 on the cardinal line in more or less prominent extensions. Dorsal valve plano- 

 convex medially aud regularly convex laterally: convexity varying with age. strong- 

 est in the larger specimens; point of greatest elevation about mid-length. Ventral 

 valve convex from the beak to nearly mid-length, from here to the anterior margin, 

 and laterally as well, strongly concave, with the postero-lateral portions somewhat 

 deflected. Surface stria? distinctly alternating, from three to five smaller lines 

 between the sharply elevated larger ones. The alternation of the striae most distinct 

 in the posterior half. 



