178 ROYAL SOCIETY OF CANADA 



Agraulos (?) NANUS, n. sp. (PI. IL, %8. 5 a and b.) 



A small species, of which only the centre-piece of the head-shield is 

 known. Anterior part of the head-shield strongly deflected downward- 

 Marginal fold as broad as the area in front of the glabella. Glabella 

 cylindro-conical, as wide as long, scarcely distinguishable from the cheeks 

 in front, bordered by a broad, shallow furrow behind ; no glabellar fur- 

 rows. Occipital ring heavy, depressed behind. Fixed cheeks, narrow ; 

 ocular fillet, faintly shown ; eyelobes long, about one-third of the length 

 of the suture. Suture parallel to the side of the glabella, except behind 

 the eyelobe, where it projects. Posterior marginal furrow, shallow, broad 

 outwardly ; the posterior marginal fold, narrow. 



Sculpture. — The surface of the shield shoAvs a very minute granula- 

 tion. 



Size. — Length of the head, 6 mm. ; width of the middle piece of the 

 head in front, 5 mm. ; at the eyelobes, 7 mm. ; at the back, about 7 mm. 



Horizon. — Limestone band of the gray shales. 



The wide glabella of this species distinguish it from others ; the 

 width of the fixed cheek and eyelobe together equals only that of half 

 the glabella. 



This species has points of resemblance to Conocephalites miser, Bill., 

 as identified by Walcott, but it difi'ers in the smooth and shorter glabella. 



It is difficult to determine where this species should be placed ; viewed 

 from above it has the form of Ptychoparia, but the bending down of the 

 shield in front and the efl'acement there of the dorsal suture is common 

 in Agraulos, the heavy occipital ring and shallow occipital furrow also 

 point to that genus ; but, on the other hand, a large glabella, such as 

 this species has, is more common in Conocephalites. 



Agraulos (?) pusillus, n. sp. (PI. IL, figs. 6 a and b.) 



Minute. — Only the middle piece of the head-shield known. This has 

 a lunate anterior marginal fold, nearly as wide as the front area of the 

 cheeks ; the two together are equal to the occipital ring, including the 

 occipital spine. The glabella is conical, rounded in front and about twice 

 as wide as one of the fixed cheeks, and has three faintly marked pairs of 

 furrows. The fixed cheeks are tumid and are crossed by a faint ocular 

 fillet ; the eyelobes are opposite the front third of the glabella. The 

 posterior and occipital furrows are distinctly impressed, and the occipital 

 ring terminates in a strong spine. The dorsal furrow is distinct!}' im- 

 pressed all around. 



Sculpture. — The surface is covered with closely set granulations- 

 visible with a lens. 



