A Contribution to the Lower Devonian Faunas of Maryland 53 



The species presents features of interest in the character of the frontal 

 ornamentation. Dr. J. ^I. Clarke has discussed this feature of the genus.' 

 The present species seems to have close affinities with D. hicornis Hall, 

 of the Waldron fauna, as regards the bifurcating frontal process, but it 

 shows a much higher development of this feature than does any other 

 species of this genus of which the writer knows. 



Occurrence. — Oriskaxy Formation, Ridgely Member. Knobly 

 Mountain near Cuml)erland. 



Collections. — Marvland Geological Survey, U. S. National Museum. 



Dalmanites latus n. sp. 

 Plate XCIII, Fig. 2 



Description. — Cephalon and thorax unknown. Pygidium broadly ovate 

 in outline, the lateral margin incurving rapidly on approaching the 

 posterior extremity which in outline has the form of a low arc; axis of 

 medium width, tapering gradually to a subacute terminus ; dorsal furrows 

 narrow, direct, deeply incised by transverse furrows especially anteriorly ; 

 segments 17, narrow; transverse ridges narrow, erect, convex anteriorly, 

 wider than the intervening furrows, probably not ornamented ; pleura' .14 

 in number, slightly curved for about three-fourths of their length from 

 the dorsal furrows, then curving suddenly backward; ridges narrow, about 

 as wide as the intervening furrows, erect, each with a longitudinal groove 

 in the middle which becomes obsolete on the posterior ribs, and bears 

 an occasional pustule. 



This species is founded on a single pygidium in the U. S. National 

 Museum. Its broadly ovate outline, the number and character of the 

 annulations mark it as a distinct species. 



Occurrence. — Oriskaxy Formation, Eidgely ^Member. Cumberland. 



Collection. — II. S. National Museum. 



^ The Oriskany Fauna of Becraft Mountain. Mem. N. Y. State Mus., vol. iii, 

 No. 3, 1900, pp. 16, et. seq. 



