EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA I 29 



or that figured on plate 8 and referred to previously as possibly pertainino- 

 to D. micrurus, tliough differing from those associated with cephala 

 of the latter at the Grantle Cave and Dalhousie. 



Locality: Between Grande Gr^ve and Little Gaspe. 



Species name. Daniel Ga\'ey of. Grande Greve. 



Dalmanites (Probolium) biardi nov. 



Plate 6, figures 1-12 



P h a c o p s \v e a V e r i ? Salter. Silurian 'rrilol)ites. 1864. P- 57, fig- ^5 



There are two species of Dalmanites at Perce, one of them, the more 

 common and that now described, a representative of the rare group of 

 snouted forms to which Oehlert has applied the term Probolium ' and which 

 is exemplified by D. nasutus Conrad and D. tridens Hall of the 

 Helderbergian of New York. This species has these characters. 



CcpJialon broacll)' subelliptical in outline, short axially, like the prevail- 

 ing type -in. contemporaneous faunas ( D. anchiops, pleuroptyx, 

 St e mm a t u s , nasutus, tridens). Glabellar division normal but the 

 usual fusion of lobes i and 2 at their distal extremities which affects so 

 many of the early Devonic species of Dalmanites, is not strongly expressed 

 and herein again there is agreement with D, (P r o b o 1 i u m) nasutus 

 and tridens. Margin entire except near the anterior extremity where 

 there is a series of broad low scallops or crenulations, 3 or 4 in number on 

 each side of the snout. These are so obscure that they are seldom seen 

 except on casts of the ventral surface of the border and in such cases the 

 outermost sometimes assumes the aspect of a pair of subsidiary spines. 

 The snout is axial, has a broad base, is contracted in diameter medially and 

 at the distal extremit)- carries a trident the central process being axial, the 

 other two di\'erging jjalmately and all considerably extended. There seems 

 to be some variation in the. length of this process but apparently it was from 

 one third to one half as long as the cephalon itself. The entire process is 

 flat. In the trilobeci species of the New Scotland beds, D. tridens, there 

 is likewise noticeable variation in respect to the development of these proc- 

 esses as shown by the figures given in Palaeontology of New York, v. 3, 

 1859, pi. 75, fig. 3-6. A very fine specimen collected by the late C. E. 

 Beecher from these beds in the vicinity of Clarksville, has these processes 

 so much reduced that the extremity takes on a spatulate outline. (See 

 plate 5, fig. I.) The genal spines are relatively broad and short. The sur- 

 face of the cheek below the visual area is deeply grooved, the facial suture 

 on the cheeks does not lie in a furrow and the surface below the eyes shows 

 only rather obscure traces of confluent papillae. The general surface is 



■Bull, de la Society Gfeol. de France, 3 ser. 1889. 17 : 759. 



