56 A CoxTRiBUTiox TO THE Lower Devonian Faunas of Maryland 



Subgenus CORYCEPHALUS 



Dalmanites (Cokycephalus) dentatus Barrett ? 



Plate XCIII, Fig. 4 



Dalmanites dentata Barrett, 1876, Amer. Jour. Sci., 3d ser., vol. xi, p. 200, pi. 



Dalmanites dentata Barrett, 1876, ibid., vol. xil, p. 70. 



Dalmanites {Corycephalus) dentatus Hall and Clarke, 1888, Nat. Hist. N. Y., 



Pal., vol. vii, p. 58, pi. xi«. figs. 4-6. 

 DalvLanites dentatus Waller, 1003, Geol. Survey N. J., Pal., vol. iii, p. 339, pi. 



xliv, figs. 1-3. 



Description. — "■ Head siibcrescentiform, the lateral and anterior mar- 

 gins forming a parabolic curve, the genal angles extended into rather blnnt 

 spines. Glabella depressed convex, broadest in front, surrounded by a 

 well-defined dorsal furrow, frontal lobe broader than long, subelliptical to 

 subrhomljoidal in outline. First pair of lateral furrows broad a ad deep, 

 extending obliquely backward from the dorsal furrow and connected 

 across the median portion of the glabella by a shallow depression. First 

 and second lateral lobes partially coalescent externally by the shallowing 

 of the second lateral furrows, the third pair of lateral lobes entirely sepa- 

 rate from the second. Second and third pairs of lateral furrows indis- 

 tinctly continuous across the median portion of the glabella by slight de- 

 pressions. Occipital furrow sharply defined, continuous across the gla- 

 bella and extending out upon the cheeks. Occipital segment of about the 

 same width, luit a little higher than the posterior lateral lobes. Clieeks 

 convex in general contour, with a slightly thickened marginal border. 

 Eyes large, subcrescentiform, their summits as high or higher than the 

 glabella, their anterior extremities opposite the first and their posterior 

 extremities opposite the third lateral furrows of the glabella, bounded 

 externally around the base of the faceted surface by a sharp depression, 

 beyond which is a suljangular ridge. Between this ridge and the slightly 

 thickened cheek margin the surface is concave. The entire lateral and 

 anterior margin of the head is ornamented with a continuous series of 

 from twenty-five to thirty-fi\e triangular, tooth-like processes, largest in 

 front and decreasing regularly in size to the genal angles. The surface 

 of the glabella and those portions of the cheeks lying between the eyes and 

 the glabella, except in the furrows, is covered with rather coarse, irregu- 

 larlv arranged, circular tubercles, the outer portions of the cheeks, includ- 



