502 Systematic Paleontology 



each of the transverse ridges several spines more crowded toward the dorsal 

 furrows, but with no regular arrangement observable; the plural ribs 

 studded with pustules varying greatly in size and occupying usually a 

 medial position on the rib. 



The cephala are fragments and are completely separated from their 

 pygidia. Each belongs to a large species. Eelying then on the highly 

 probable conjecture of identity of localities and on the large size of the 

 individuals, the writer has referred the pygidia and the fragmentary 

 cephala to the same species. It must remain for future investigation to 

 show the truth or falsity of such reference. 



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

 ornamentation. Dr. J. M. 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. — Oriskany Formation, Eidgely Member. Knobly 

 Mountain near Cumberland. 



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



[Ohern.] 

 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 ; pleurae 14 

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

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



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

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



