36 



NEW SPECIES OF FOSSILS. 



Description of a new species of Harpes from the Trenton Lime- 

 stone, Ottawa. 



Harpes Dentoni. (N. sp.) 



(The glabella is distorted in the posterior half.) 



Description : — The head of this species, exclusive of the poste- 

 rior prolongation of the border, is nearly semi-circular. The 

 border itself is not wholly preserved in the specimen, so that its 

 ■width cannot be ascertained. The length of the head without 

 the border is six lines, and its width on a line running across the 

 neck segment • one inch. The margin is prolonged backwards 

 thirteen lines from the neck furrow. The head is rather strongly 

 convex, its elevation at about mid-length of the glabella being 

 about four lines in the specimen, although a little depressed by 

 distortion. The glabella is strongly convex being elevated nearly 

 one line above the level of the cheeks ; it is obtusely rounded in 

 front, and appears to be nearly as broad where a line drawn 

 through the eyes crosses it as it is at the neck furrow, but on 

 this point there is some doubt as the posterior portion is crushed. 

 The neck furrow is well defined across the glabella, and curves 

 a little forward on the median line. The neck segment is well 

 developed. On each side of the base of the glabella, there is an 

 irregularly semi-oval space, the outer margin of which, is abruptly 

 sunk about half a line below the general surface of the cheeks. 

 This space is bordered on its posterior margin by the neck fur- 

 row ; — on the outer and anterior side, by a nearly vertical eleva- 

 tion of the crust of the cheek, the outline of the space making 

 an obtusely rounded curve on the outside and then turning inward 

 and forwards to the glabella, which it reaches at an acute angle 



