Maryland Geological Survey 237 



bank Evitts Creek below Wolfe Mill ; Williams Road 14 ™i'e east of Queen 

 City Hotel, Cumberland ; B. & 0. R. E. cut at 21st Bridge ; Williams Road 

 3^ miles southeast of Cumberland ; McCoys Ferry ; southwest of McCoys 

 Ferry; on National Road northeast of Cumberland; on the Romney- 

 Hanging Rock Road about ^ mile north of Romney, W. Va. ; 1 mile north 

 of Romney, W. Va. 



Collections. — Maryland Geological Survey; New York State Museum; 

 American ]\Iuseum of Natural History. 



Palaeoneiix) plana Hall 

 Plate XXVI, Figs. 13-15 



Palaeoneilo plana Hall, 1870, Prelim. Notice Lamellibranchiata 2, p. 7. 

 Palaeoneilo plana Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamellibranchiata ii, 



p. 334, pi. xlviii, figs. 21-28. 

 Palaeoneilo plana Clarke, 1903, N. Y. State Mus., Bull. 65, p. 478. 

 Palaeoneilo plana Grabau and Shimer, 1909, N. Am. Index Fossils, vol. i, 



p. 399, fig. 510f. 



Description. — " Shell below the medium size, transversely elliptical, 

 compressed, elongate and somewhat pointed behind; length almost twice 

 the height; basal margin regularly and gently rounded, with a slight 

 and undefined constriction near the posterior end which is acutely 

 rounded ; anterior end regularly rounded ; cardinal line declining on each 

 side of the beak. Valves depressed-convex; beaks anterior to the center, 

 small, rising but little above the hinge-line; umbonal slope not defined, 

 obscurely indicated by an undefined depression, which scarcely constricts 

 the margin. Surface marked by very fine concentric striae, which are 

 often obscure or obsolete." Hall, 1885. 



Several specimens of a small Palaeoneilo were found in rather thin bhie 

 shales which agree fairly well with the above description and are referred 

 to this species. Part of the specimens are smaller than the type ones 

 of P. plana but agree closely witli the outlines and proportions of that 

 species. One specimen resembles very closely fig. 31, pi. xlviii, Lamelli- 

 branchiata ii, pt. i, vol. V, Pal. N. Y., with the exception of the posterior 

 constriction which is slightly stronger than in this species and in this 

 character something like P. constricta. The species is closely related to 



