Maryland Geological Survey 333 



Genus DALMANITES Barrande 



Dalmanites (Cryphaeus) bootiti (Green) 

 Plate XLIV, Figs. 1-4 



Cryphaeus lioothii Green, 1837, Am. Jour. Sci., vol. xxxii, p. 343 and figure. 

 Dalmania bootlni Hall, 1861, Descriptions New Species of Fossils, etc., p. 63. 

 Dalmania hoothii Hall, 1862, Fifteenth Rep. N. Y. State Cab. Nat. Hist, p. 91. 

 Dalmanites hoothii Hall, 1876, Illustrations of Devonian Fossils, pi. xvi, figs. 



1-6, 9-11, 13, 15, 16. 

 Dalmanites (Cryphaeus) hoothi Hall and Clarke, 1888, p. 42, pi. xvi, figs. 



1-4; pLxvi A, figs. 3-8. 

 Dalmanites boothi Keyes, 1891, Johns Hopkins Univ. Circ, vol xi, p. 29. 

 Dalmanites (Cryphaeus) boothi Clarke, 1903, N. Y. State Mus., Bull. 65, 



p. 683. 

 Cryphaeus boothi Grabau and Shimer, 1910, N. Am. Index Fossils, vol. ii, p. 



329, figs. 1647a, b. 



Description. — General form snboval, laterall}^ and posteriorly fimbriate; 

 length about one-half greater than the width ; surface depressed-convex, 

 distinctly trilobate; axis prominent, elevated. Cephalon relatively large; 

 outline semielliptical, faintly produced on the frontal margin; length 

 to width as 1 to 2; margin thickened by a broad doublure which is 

 produced at the genal angles into broad, thin and blunt spines that norm- 

 ally reach to the sixth thoracic segment ; glabella elongate subpentagonal, 

 length and width equal and nearly equal to length of the cephalon ; three 

 pairs of transverse furrows conspicuous; eyes large, elevated, exceeding 

 the height of the glabella; visual surface lunate with 206 lenses for each 

 eye. Thorax length to width as 1 to 1.5 ; axis arched, widest at the fourth 

 segment, tapering thence evenly to the pygidium ; pleurae flattened, gently 

 deflected along the fulcrum. Pygidium subtriangular, depressed convex; 

 axis tapering with slightly incurved margins, and ending abruptly just 

 within the posterior border, with from ten to fourteen annulations ; the 

 pleurae each bear five sulcate annulations, the anterior limbs of which 

 are flattened, thickened and produced beyond the margin as short, flat and 

 closely set spines; a similar spine, but shorter and relatively broader, is 

 produced in the axial line, thus making eleven spines in the pygidial 

 fimbria. In the normal forms the entire surface is covered with granula- 

 tions which become quite strong on the axial region of the glabella and 



