MaRYLAXD GeOT.OGICAL SUxtVEY 127 



One specimen from the shales on tlie bank of Evitis Creek below Wolfe 

 Mill agrees fairl}^ well with the figures and description of this species, 

 except that the beak is not so pointed ; another one showing the interior 

 of a valve from the B. & 0. R. T?. cut at 21st Bridge agrees fairly well 

 with this species. 



Length, 12 mm.; width, 7 mm. 



Occurrence. — Eomney Formation, HAiriLTOx Member. East bank 

 Evitts Creek below Wolfe Mill; B. & 0. E. R. cut at 21st Bridge. 



Collection. — Maryland Geological Survey. 



LiNGULA cf. NUDA Hall 



PlateVIII, Figs. 7, 8 



Lingvla nuda Hall, 1863, Sixteenth Rep. N. Y. State Cab. Nat. Hist., p. 22. 

 Lingula nuda Hall, 1867, Pal. N. Y., vol. iv, p. 10, pi. 11, figs. 4-6. 

 Lingula nuda Schuchert, 1897, Bull. U. S. Geol. Surv., No. 87, p. 251. 

 Lingula nuda Clarke, 190.3, N. Y. State Mus. Bull. 65, p. 247. 



Description. — " Shell subelliptical ; length nearly twice as great as the 

 width ; sides subparallel, very slightly curving, the greatest width near the 

 center; front truncated. Cardinal slopes rounded, the ventral valve a little 

 more pointed and more convex than the dorsal valve. Dorsal valve nearly 

 flat. Ventral valve, in exfoliated specimens, marked by a depressed line 

 down the center. Surface marked by fine concentric striae, which, on the 

 margins, are crowded and wrinkled." Hall, 1867. 



There is apparently a slightly raised median line, while the concentric 

 striae are faintly shown near the margins of the shell. The specimen from 

 Williams Eoad 3^ miles southeast of Cumberland was sent to Dr. J. M. 

 Clarke who wrote as follows regarding it : " The Lingula seems to me, 

 notwithstanding its distortion by shearing, a specimen of L. nuda or 

 L. densa. It agrees well with either in outline ; better with the former 

 in size." Prof. Schuchert made. the following note regarding the same 

 specimen : " Tt looks to me more like a young compressed L. punctata; 

 but I would not be sure of this." In the writer's opinion the specimens 

 approach L. nuda more neai'ly than any other species.^ 



^ The latter is shown on pi. viii, figs. 9, 10. 



