THE FAUNA OF THE KEYSER MEMBER OF 



THE HELDERBERG FORMATION 



IN MARYLAND 



BY 



THOMAS POOLE MAYNARD^ 



MOLLUSCOIDEA 



Class BRACHIOPODA 

 Order PROTREMATA 



Superfamily ORTHACEA 

 Family ORTHIDAE 



Genus DALMANELLA Hall and Clarke 



DaLMANELLA CI.ARKI )1. sp. 



Plate LlA^Fi.^.s. M() = 



Description. — JSiibcircular to transversely subelliptical in outline, wider 

 til an long, hinge-line shorter than the greatest width of the shell. Pedicle 

 valve very convex, very gibbous to ventricose, beak pointed and strongly 

 incurved ajid arched over the cardinal area. Brachial valve depressed 

 convex with a well-defined mesial sinus, Avhich extends from the beak to 

 the front, narrow at the beak and becoming gradually wider towards tlie 

 front; beak small, pointed, incurved, extending only slightly above the 

 hinge-line. The surface of both valves marked by fine radiating stria?, 



' Manuscript submitted June, 1909. 



-All references to figures are to the Lower Devonian report of the Maryland 

 Geological Survey in which the plates and text were published. 



