A Contribution to the Lower Devonian Faunas of Maryland 17 



All the specimens seen are casts of the interior, but there is little 

 doubt as to the generic affinities. The naming of the species is a humble 

 compliment to the late Dr. E. B. Kowe. 



Occurrence. — Oriskany Formation, Eidgely Member. Hancock. 



Collection. — Maryland (geological Survey. 



Family PINNID/E 



Genus PALEOPINNA Hall 



Paleopinna lata n. sp. 



Plate LXXYI, Fig. 1 



Description. — Shell large, very oblique, axis and hinge-line making an 

 angle of about 23°; greatest length to greatest height as about 3 to -1 ; 

 anterior margin truncate and emarginate, ventral margin broadly and 

 regularly curving, posterior margin more rapidly rounding and recurving 

 to meet the hinge-line; left valve gibbous in middle and anteriorly, de- 

 pressed posteriorly and dorso-posteriorly ; right valve not known. Umbo 

 wide, beak probably extending to posterior limit of body; a narrow ridge 

 extending from beak (?) along hinge-line to posterior end of dorsal 

 margin. Interior marked by broad obsolete growth lines. Exterior un- 

 known. 



Length 8.75 cm.; height 6 cm. 



The description is from the cast of the interior of the left valve of a 

 single specimen. It has all the marks of this genus and is readily separabL- 

 from the other species of tliis genus by its great breadth. A part of the 

 postero-dorsal extremity and of the beak is broken off. 



Occurrence. — Oriskany Formation, Eidgely Member. Hancock. 



Collection. — Maryland Geological Survey. 



Family PTERllDAE 



Genus ACTINOPTERIA Hall 



xIctinopteria communis (Hall) 

 Plate LXXVI, Figs. 2-4 



Avicula communis Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 286, pi. lii, 



figs. 1-7; pi. llii, figs. 1, 4, 6, 1861. 

 Actinopteria communis Clarke, 1900, Mem. N. Y. State Mus., No. 3, vol. iii, p. 



34, pi. iv, figs. 1, 2. 

 Actinopteria communis Weller, 1903, Pal. N. J,, vol. iii, p. 292, pi. xxxi, fig. 21. 



