A Contribution to the Lower Devonian Faunas of Maryland 19 



Dating stria-, crossed by finer, concentric strife, giving to the whole a can- 

 cellated effect whicli is somewhat more marked on the po^;terior wing. 

 These specimens are very like those figured by J. M. Clarke under this 

 species and may be wholly identical with them. It seems best, however, 

 to designate them as a variety, but their fragmentary condition will not 

 permit definition. 



Occurrence.— Oriska-^y Formation, Eidgely Member. Winchester 

 Eoad and Miller's Spring near Cumberland. 



Collection. — Maryland Geological Survey, 



Actinopteria textilis (Hall) 

 Plate LXXVI, Fig. 5 



Avicula textilis Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 288, pi. lii, figs 

 9, 10 ?; pi. liii, figs. 2, 3, 5, 7, 10, 1861. 



Actinopteria textilis Weller, 1903, Pal. N. J., vol. iii, p 332 pi xliii fies 

 13, 14. . • » 6 . 



Description.—" Body of the shell obliquely subovate ; length about once 

 and a half the height, becoming regularly convex from the base, gibbous 

 in the middle, and gently depressed along the line of junction with the 

 posterior wing; ventral margin very regularly and broadly curved ; hinge- 

 line greatly extended : posterior wing long, nearly three times its greatest 

 width, the extremity extending beyond the margin of the shell, the margin 

 moderately sinuate. Surface marked by regular strong radiating ribs, 

 which, at the base, are distant from each other three times their width; the 

 intermediate space marked by a central finer ray, and, on each side between 

 it and the larger costa?, are one or two still finer rays, which are scarcely 

 perceptible to the naked eye : these are crossed by concentric ridges, giving 

 a cancellated surface and a slightly nodose character to the larger costa^. 

 The wing is marked by strong radiating and concentric strire, which are of 

 nearly equal size, and slightly nodose at their junction." Hall, 1859. 



Length 4.7 cm.; height 4.5 cm. 



Occurrence.— Uelberberg Formation, New Scotland Member. 

 Cumberland, Dawson. 



Collections. — ]\[aryland Geological Survey, George M. Eoeder. 



