FOSSILS OF THE ACADIAN GROUP. 6.51 



short, and appear to be parallel with the transverse diameter, but 

 they are not always distinct. 



Occipital furrow deep, slightly arched forward in the middle, and 

 with the ends turned in the same direction; occipital ring of moderate 

 width, the middle is produced into a spine often more than a quarter 

 of an inch in length. This spine is more or less strongly directed 

 backwards. The cheek-lobes are very gibbous, more so than tlic 

 glabella. Their posterior border is so strongly impressed by the 

 posterior furrow that it arches slightly over it. The surface of the 

 convex part of the shield is ornamented by very fine, close-set granu- 

 lations, distinctly visible to the naked eye, and by a set of delicate 

 little tubercles more sparsely sown. 



Rather uncommon at Ratcliflfe's Millstream. — J. W. Ilartt, Prof. 

 Bailey, Mr Matthew, C. F. Hartt, and N. B. Survey, 1864. This 

 bears in its granulated surface a strong likeness to C. Matthewi, but is 

 distinguished from that species by the thickened, triangular, anterior 

 border, the wider glabella less deeply lobed, and by the long occipital 

 spine. The fine granulations are more distinct, while the coarser are 

 tubercles and not spines. It is larger than C. Matthewi. Specimens 

 without anterior border, and with badly preserved surface markings, 

 are apt to be taken at first sight for C. Ba'deyi. The glabellar of these 

 two species are very alike in outline, but C Baileyi wants the gla- 

 bella furrows, or has them only indistinctly marked. 

 , Conocephalites Ouangondianus, Hartt, MS. Head, without mov- 

 able cheeks, strongly convex in outline, somewhat sub-angular in front ; 



much narrower in front than behind, where width is „. „.. 



Fig. 226. 



greater than the length ; width in front very nearly 



equal to length ; anterior margin wide, with a strong 



fold, whose axis is strongly inclined forwards, so that 



it presents a short, steep, convex slope forward, and 



a long concave slope in the inner side, being much Comcephahtes 



less elevated than glabella or fixed cheeks. 



Glabella long, ovate-conical, nearly twice as wide posteriorly 

 as in front, very convex, slightly sub-angular at tlie middle ; sides 

 straight, inclined to one another so as to meet in the middle of front 

 margin if produced ; rounded in front. Casts sometimes showing 

 three pairs of short, raised, transverse lines on the sides of glabella, 

 occupying the position of the ordinary glabella furrows ; of these the 

 two posterior arc directed obliquely backwards. In some specimens 

 tliere seems to be a fourth pair in advance of the other, represented 

 by little tubercle-like processes, situated on the side of the glabella in 

 front, just where the sides curve to the front. Glabella very much 

 more convex than fixed cheek. 



