KOTES Oisr THE FOSSILS OP ONTARIO. 



151 



47. GcENiTES LAMiNATA, Hall. {Ref. Limaria laminata, Hall, Pal, 

 N.Y., Vol. II., pi. xxxix. figs. Qa-d.) Oorallum encrusting or mas- 

 sive, the calices somewhat .crescentic, with two prominent rounded 

 teeth in the concave side of the crescent. (Fig. 2e.) Calices not promi- 

 nent, about one-third of a line in their long diameter, and one-sixth 

 of a line across, separated by about their length ; six or seven in the 

 space of two lines on an average. 



The calices appear to be separated by a well developed coenen- 

 chyma ; but it is probable that this is only an appearance, and that 

 it is really due to the great thickening of the walls of the corallites 

 and tlieir amalgamation with one another. 



Locality and Formation. — -Niagara Limestone, Eockwood. 



48. CcENiTES LUNATA, Nicholsou and Hinde. Coi-allum forming a 

 thin crust, apparently about two-thirds of a line in thickness. Calices 

 strongly curved, crescefitic or lunate, their foi-m being due to the 

 projection into their cavity of a single strong rounded tooth developed 

 from the concave lip. (Fig- 2, b and c.) Calices about one-fourth of 

 a line in their long diametei', and one- eighth of a line across ; eight 

 in the space of tAvo lines. Corallites perpendicular to the sui'face, 

 appearing as if embedded in a dense coenenchyma, though this is 

 most probably due simply to the great thickening of their walls. 



Fig. 2. — a, Fragment of Coinites lunata, Nich. and Hinde, natural size ; b, 

 Portion of the same enlarged ; c, vSingle calice of the same still further 

 enlai'ged ; d, Fragments of C(£)i'des laminata, Hall, natural size; e, 

 Single corallite of the same enlarged. From the Niagara Limestone. 



Of all the described species of the genus, 0. lunata is most nearly 

 allied to C. laminata, Hall ; but it is distinguished by the smaller 

 size of the calices, their more markedly crescentic form, and the 

 possession of a single roundeJ caiicine tooth instead of two such. 



Locality and Formation. — Niagara Limestone, Owen Sound. 



49. Striatopora flexuosa. Hall. (Bef. Pal. N.Y., Vol. II., pi. 

 xl. B, figs. Icf-e.) Not uncommon in the Niagara Limestone of 

 Thorold. 



50. Alveolites Fischeri, Billings. (i^ef. Canadian Journal, 

 New Series, Vol. V., p. 256, fig. 6.) Fi'om the Niagara Limestone' 



