FOSSILS OF THE CARBONIFEKOUS LIMESTONES. 



287 



of tlie same species, at West River, Picton. In old specimens the 

 sides become very rugose, and the coral becomes narrowed at the top. 



Fig. 84.— (a) Zaphrentis Minas ; (h) CyathophrjUum Billingsi. 



CyathophjUum Billingsi^ n. sp. (Fig. 84, 5).— Corallum circular in 

 cross section, short, curved at the base. Unbroken surface with 

 vertical low ribs and strong transverse plates ; broken surface with 

 square reticulation. Calice shallow, Avith about forty equal, straight 

 septa. Coll. Hartt, Lower Stewiacke. 



Fig. 85. — (a) Stenopora exilis ; {b) Chaetetes tumidus. 



Stenopora exilis, n. sp, (Fig 85, a), coll. J. "VV. D. and C. F. Hartt, 

 Shubenacadie, AVindsor, Stewiacke. — This is the coral, or one of the 

 corals, designated as Ceriopora spongites in my former edition, and it 

 is scarcely distinguishable by external characters from Calamj)ora 

 Macrothii, of King's Permian fossils ; but it wants entirely the generic 

 characters of Calamopora, and therefore I describe it here as a distinct 

 species, though by no means affirming that it may not be identical 

 with some of the species of little branching Carboniferous corals about 

 which so much confusion exists. It presents slender cylindrical 

 branches, ramifying irregularly and sometimes anastmosing, from half 

 a line to a line in diameter, and covered with minute contiguous hex- 

 agonal cells with small spines or papillae on their separating walls. 



