230 Systematic Paleontology — Middle Devonian 



The Maryland specimens are fragmentary or badly distorted by pres- 

 sure ; bnt tliey have the strong imdiilations with intercalated ones, promi- 

 nent beaks and some of the other characters which characterize this 

 species. Furthermore, the species was identified by Hall from the soft 

 shales of the Hamilton group at Pattersons Creek, [West] Virginia (Pal. 

 N. Y., vol. V, pt. i, Lamellibranchiata II, p. 374). 



Length, 40 mm. ; height, 20 mm. or more, specimen badly crushed. 



Occurrence. — Romney Formation, Hamilton Member. Town Creek 

 about 6 miles north of Oldtown; Pine Hill 5 miles north of Oldtown; 

 McCoys Ferry; southwest of McCoys Ferry; Williams Eoad, ?)\ miles 

 southeast of Cumberland. 



Collections. — Maryland Geological Survey; Xew York State ^luseum; 

 American Museum of Natural History. 



Geammysia sp. 



Description. — This genus is represented in the Onondaga of Maryland 

 by a single specimen showing only the anterior portion of a right valve. 

 It represents a species of the same general type as G. suharcuata. 



Occurrence. — Romney Formation, Onondaga Member. Williams 

 Road, 3^ miles southeast of Cumberland. 



Collection.— \J. S. National Museum. 



[E. M. Kindle.] 



Grammysia circularis Hall (?) 

 Plate XXIII, Figs. 1-3 



Grammysia circularis Hall, 1870, Prelim. Notice Lamellibranchiata 2, p. 51. 

 Grammysia circularis Hall, 1885, Pal. N. Y., vol. v, pt. i, Lamellibranclaiata ii, 



p. 364, pi. Ivii, figs. 3-6; pi. Iviii, fig. 13. 

 Grammysia circularis Clarke, 1903, N. Y. State Mus., Bull. 65, p. 398. 

 Grammysia circularis Grabau and Shimer, 1909, N. Am. Index Fossils, vol. i, 



p. 383, fig. 486g. 



Description. — Shell varying from medium to large size, subcircular 

 in outline, ventricose; length about one-fifth gi'eater than the height; 

 basal margin regularly rounded, except a slight sinuosity posterior to the 



