33-i Systematic Paleontology — Middle Devonian 



thorax, and the surface of the pygidial fimbria, where the granules be- 

 come elongate and pustiiliform, often crowded and more conspicuous than 

 upon the surface of the shield itself. 



The representatives of this species in the Maryland Collection consist 

 almost entirely of specimens of pygidia which have been found more 

 abundantly in the thin argillaceous shales on the east bank of Evitts Creek 

 just below Wolfe Mill than at any other locality. One badly crushed 

 specimen shows the larger portion of the thorax and the posterior part of 

 the cephalon, while another shows the pygidium and one side of the 

 thorax. The pygidial fimbria in all the specimens are broad, fiat, granu- 

 lose and contiguous as in those of this species and not lanceolate and 

 relatively narrow as in D. boothi, var. calliteles Green, They were also 

 compared with authentic specimens of D. hooilii in the office of the New 

 York State Paleontologist and found to be practically identical. It is to 

 be remembered that the original specimens of D. hoothi were obtained 

 from near Huntingdon, Huntingdon County, Pennsylvania (Am. Jour. 

 Sci., vol. xxxii, 1837, p. 345). 



Length of pygidium, 10 mm. ; width, 17 mm. 



Occurrence. — Eomney ForaiATioN, Hamilton Member. East bank 

 Evitts Creek below Wolfe Mill ; on road about half way between Eomney 

 and Hanging Eock, W. Va. 



Collections. — ^Maryland Geological Survey; New York State Museum; 

 American Museum of Natural History. 



Dalmanites marylandicus n. sp. 



Plate XLIV, Fig. 5 



Description. — A single pygidium was found in the lower Hamilton 

 shales at Ernstville, ]\Id., which is considered distinct from other species 

 of this genus, and shows the following characters: Pygidium subovate 

 triangular in outline, conspicuously trilobed and composed of 23 or 24 

 annulations ; axis moderately convex, tapering gradually and extending as 

 far as the posterior margin, marked by two rows of tubercles of which 

 each segment bears two, one on each side of the middle and most convex 



