388 
THE PALEONTOLOGY OF MINNESOTA. 
[Strophomena neglecta. 
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 locality. — 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, Beloit, Janesville and Green Bay city, Wisconsin. In the 
Trenton limestone at Dixon and Dunleith, Illinois: Auburn, Lincoln county, Missouri. In the Black 
River, and at the top of Birdseye limestone near High Bridge, 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. H. Scofleld, E. O. Ulrich and the writers. 
Mus. Beg. Nos. 669, 2147, 3733, 3734, 6771, 6773, 6795, 8167-8178. 
Strophomena neglecta James, sp. 
1873. strophomena filitexta Meek (non Hall) Palaeontology of Ohio. vol. i, p. 83, pi. vi, figs. 5a to 5d. 
?1875. Strophomena 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 Palteontologist, no 5, p. 41. 
1883. Streptorhynchus filitextus (parti m.) Hall. Second Annual Report New York State Geologist, 
pi. XLii, flgs. 10 and 15 (not figs. 11-14); pi. xxxix, figs. 1-7. 
1892. Strophomena filitexta Hall. Palaeontology of New York, vol. viil, 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. inciirvata Shepard. 
Formation and locality.— Oxford, Clarksville, Waynesville and elsewhere in southwestern Ohio. 
Richmond, Versailles and Weisburg, Indiana; Savannah, Illinois; ? Silver City, New Mexico. 
Strophomena neglecta, var, acuta, v. v<ir. 
plate XXXI, FIG-S. 6 and T. 
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 laterall}', and terminating 
on the cardinal line in more or less prominent extensions. Dorsal valve plano- 
convex medially and 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 striae distinctly alternating, from three to five smaller lines 
between the sharply elevated larger ones. The alternation of the striee most distinct 
in the posterior half. 
