FOSSILS OF TOE POTSDAM GROUP. 219 



CREnCErilALXTS (LOGANELLUS) ANYTUS 11. Sp. 

 Plato II, figs. 10-21. 



Glabella and fixed cheeks, when united, irregularly quadrangular in 

 form, contracted at the eyes, and broadly spreading below by the projecting 

 postero-lateral limbs. 



Glabella conical, moderately tapering anteriorly; the height and width 

 al)out ecpial, measuring from the occipital furrow, and the width of tlie 

 anterior end equaling two-thirds of the height; marked by three pairs of 

 transverse furrows, the posterior and middle ones distinct and strongly 

 recurved, situated at the first and second third of the length of the glabelhi; 

 anterior furrows small and faintly marked, rising from the antero-lateral 

 angles of the glabella and directed obliquely backward; occipital furrows 

 broad and well defined; ring distinct and moderately elevated. 



Fixed cheeks about half as )vide at the eyes as the Avidth of the ante- 

 rior end of the glabelk, widening in front and rapidly expanding behind, 

 moderately elevated but not prominent; ocular ridges very strong, in-omi- 

 nent, and rounded; frontal hmb as long as the width of the front of the 

 glabella, and rather rapidly sloping from the glabella to the anterior mar- 

 ginal rim, which is of moderate width, and rounded in the smaller specimens, 

 but becomes thin and somewhat projecting and angular in the center in 

 older individuals. A distinct angularity along the median line of the entire 

 head is a noticeable feature. Postero-lateral limbs triangular, their length 

 from the dorsal furrows about once and a half as great as their breadth at 

 base, the lower edge distinctly grooved by the occijiital furrows. Facial 

 sutures distant on the anterior margin of the head, and rapidly converging 

 to the eye, behind Avhich they are directed obliquely backward to the 

 posterior border of the head, at an angle of about thirty-five degrees to the 

 occipital border, forming a slightly sigmoidal line. 



Movable cheeks irregularly triangular, elongated in a postero-lateral 

 direction, and produced behind in form of a sharp, rather slender spine, one- 

 half as long as the cheek; central area convex, and strongly marked with 

 radiating stria?; border wide and flattened, or slightly rounded; ocular 

 sinus small. 



Pygidium transversely elliptical, obtusely angular at the lateral extrem- 



