Maryland Geological Survey 623 



less curved along flic basal margin, and the constriction of the posterior 

 end is so slight as to be scarcely detected in most individuals." ITall, 

 1885. 



Occurrence. — Jennings Formation, Parkhead Member. National 

 Eoad, on Polish Mountain, 1196 ?; 2 miles west of Pawpaw, West Vir- 

 ginia, 1484, 17G3 common. Woou.mont Member, Ithaca Fauna. Two 

 miles west of Pawpaw, West Virginia, 1388; Little Orleans 1446; Wood- 

 mont 1032, 1067 cf.; Hancock, 1149 to 1274; Berkeley Springs, West 

 Virginia, 1674 cf . ; Yellow Springs, West Virginia. 



Collection. — Maryland Geological Survey. 



Pal.eoneilo filosa (Conrad) 

 Plate LXI, Figs. 11, 12 



NucuUtes filosa Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, p. 250, 



pL XV, flg. 7. 

 Palwoneilo filosa Hall, 1885, Pal. of N. ¥., vol. v, pt. i, p. 343, pi. xllx, tigs. 



33-38. 



Description. — Shells small, transversely subelongate, length about twice 

 the height; tapering posteriorly with a decided sinuosity on the posterior 

 margin caused by the oblique groove between which and the hinge is a low 

 ridge. Beaks at the anterior third of the transverse diameter. Surface 

 with regular and sharp and elevated lamellose concentric strise becoming 

 more conspicuous on the posterior slope. Dimensions of the Maryland 

 specimens, which are of smaller habit than the New York shells; length 

 9 mm., height 5 mm. 



Notwithstanding the small proportions of these shells they agree with 

 the typical form in all essential particulars. The New York shells occur 

 in the Ithaca fauna of the central region of that State. 



Occurrence. — Jennings Formation, Chemung Member. Near 

 Deer Park; Tiger Valley about 1 mile west of Wills Creek Station, 

 Pennsylvania; 214 miles northeast of Pratt near home of Mr. Cheney, 

 near base of Chemung. 



Collection. — Marvland Geological Survev. 



