12 PALAEONTOLOGY OF NEW YORK. 



single type specimen, but Kayser lias provisionally referred to this species a 

 pygidium from the Lower Devonian at Daun in the Rhine-land. 



Distribution. Hamilton group. Hydraulic limestone, Falls of the Ohio. 



Dalmanites (Crypilfus) Bootiii. 



PLATE XVI, FIGS. 1-4; and PLATE XVI a, FIGS. 3-S. 



Cryph(Bus Bootl I, Green. Amer. Journ. Science, vol. xxxii, p. 343, figure. 1S37. 



Gry% -li'i, Conrad. Second Ann. Rept Palaeont. Dept. N. Y. State Geol. Surv., p. 66. 1839. 



Oryphasus a . < !onrad Second Ann. Rept. Palaeont. Dept. N. Y. State Geol. Surv., p. 62. 1862. 



Asaph . Conrad. Third Ann. Rept. Palaeont. Dept. N. Y. State Geol. Surv., p. 204. 1S40. 



Gryphon iteles, Hall Geology of N. Y., Pt. IV, p. 201. 1S43. 



[?] Cr Miteh s, De Verneuil. Bull. Soc. Geol. de France, 2nd Ser.. vol. vii, p. 164, pi. i, fig-. 3. 1850. 



is pectinatus, P. A. Roomer. Beitr. I. znr Kenntn. d. Harzgeb., p. 62, pi. ix, fig. 27. 1S50. 

 Dahnania calliteles, Emmons. Manual of Geology, p. 138. f. 124(7). I860. 

 Boothii, Hall. Descr. New Species of Fossils, etc., p. 63. 1861. 

 \ania Boothii, Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 91. 1862. 

 Dalmanites Boothii, Hall. Illustrations of Devonian Fossils, pi. xvi, figs. 1-6, 9-11, 13, 15, 16. 1876. 

 Gryphasus stellifei; Kayser (partim). Abhandl, z. Geolog, Specialkarte von Pr. und d. Thiir. St., vol.ii.pt. 



4, p. 33. 1S7S. 

 laciniatus, Kay.-kk (partim). Abhandl. z. Geolog. Specialkarte von Pr. und d. Thiir. St., vol. ii, 



pt. 4, p. 34. 1S78. 



General Form and Proportions. Body sub-ovate, laterally and posteriorly 

 fimbriate; length about one-half greater than the width. Surface depressed- 

 convex, distinctly trilobate. Axis prominent, elevated; pleurae flattened. 



CEPHALON relatively large; outline semi-elliptical, faintly produced on the 

 frontal margin; length to width as 1 to 2. Frontal area narrow, lateral area 

 broader but mostly occupied by the strong eye-lobes Margin thickened by 

 a broad doublure, which widens under the frontal limbus to form the epistoma, 

 and is produced at the genal angles into spines which normally reach to the 

 sixth thoracic segment, and are equal in length to the axial length of the 

 glabella. These spines are broad, thin and blunt, and lie nearly in a ver- 

 tical plane. 



Tiie Facial Sutures take their origin on the lateral margins at points about 

 balf-wav between the frontal extremity and the apices of the cheek-spines, 

 pass inward and downward to the lower margin of the ocular lobe, thence 

 over the eye to the anterior edge of the frontal lobe of the glabella, meeting 

 near the anterior extremity just within the margin. 



