Contributions to Palaeontology. 



143 



CONOCEPHALITES ETLYON (n.s.). 

 PLATE II, FIGS. 10-16; AND PLATE III, FIGS. 16-31. 



Specimens consisting of the glabella and fixed cheeks, with 

 imperfect movable cheeks and pygidium. 



Glabella ovate-conical, a little wider at base than the 

 length from the occipital furrow, depressed convex, 

 arcuate : sides'gently curving on the lower half and more 

 rapidly above, slightly truncated anteriorly: furrows 

 oblique and faintly marked, extending more than one- 

 third across ; the anterior one usually imperceptible, and 

 the others frequently obscure. Occipital furrow shallow 

 and not sharply defined in the middle, deeper and more 

 strongly defined at the sides: occipital ring not elevated 

 above the general convexity of the glabella, somewhat 

 triangular in form, projecting backwards in the middle. 



Facial suture nearly vertical from the front to the eye-lobe, 

 which is anterior to the middle of the glabella : behind 

 this it makes a slight curve and extends backwards, 

 making an angle of about 60° with the line of the axis. 



Dorsal furrow very shallow at the sides, and continued 

 less distinctly in front of the glabella ; the fixed cheeks 

 being little elevated, and the glabella rising more 

 abruptly. The fixed cheeks are narrow in the upper 

 part, elevated in the direction of the eye, but the palpe- 

 bral lobe is not well defined ; the lower limb broadly 

 triangular, with a shallow posterior furrow ; the frontal 

 limb broad, depressed convex and arching downwards 

 in front, and transversely marked by a shallow groove 

 about one-third its length from the front. 



More than one hundred individuals of this species have been 

 observed on a single slab of stone, and the characters are well pre- 

 served from the smallest specimens to the largest one. 



