EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 1 33 



Dalmanites. A series of cephala showing the varialion in the frontal border from the normal 

 type. Hausmannia or Odontochile, to the Probolium condition. 



■ Hausmannia (Odontochile) with smooth border and complete glabellar lobation ; late Siluric and early Devonic. 

 2D gavcyi. with short, angular frontal projection; early Devonic, Grande Greve limestone. 3 D- g ^ i f f <> " ' . «"h 

 spatulatc snout- crly Devonic, St Alban beds. 4 D. Ion gicau d a t us Salter, with narrow prorate snout. (Wenlock). 

 5 D. (Probolium) beyrichi Kayser; early Devonic. Hartz. 6 D. (Probolium) galloisi Oehlert; early Devon.c, 

 Angers. 7 D. (P.) nasutus Conrad, with extended bifurcate snout; e.irly Devonic, Helderbergian, N. Y. 8 D. (P.) 

 esnoufi, in which the trunk of the bifurcate snout is suppressed; early Devonic, Grande Greve limestone. 9 D- ^P) 

 tridens Hall, with produced snout having a spatulate trifid extremity; early Devonic, Helderbergi.-.n, N. Y. .0 Idem. The 

 usual trifid type of extremity. 11 D. (P .) b i ard i . with short, deeply trifid snout and crenulated antelateral limbus ; early 

 Devonic. Perce. 



