148 CONTRIBUTIONS TO CANADIAN PAL/EONTOLOGY. 



4 mm. Tabula flat, narrow, rather distant from each other in vertical 

 disposition, often encroached on by the septa and the dissepiments that 

 arch obliquely upward and outward between the septa. Dissepiments 

 large and unequal near the tabulate area, becoming much smaller and 

 more regular near the periphery. The primary septa in the cup are 

 prominent, alternating with the feebly developed secondaries : below a 

 narrow central space is left forming the bouom of the cup. 



Localities. — Thorold, Ont., a few specimens collected by E. Billings in 

 1857, also by Sir W. E. Logan ; St. Catharines, Ont., collected by A. 

 Murray. Niagara formation. 



Cyathophyllum Pasithea, Billings. 

 Plate XII., figs. 5, 5a, r ob. 



Cyathophy Hum Pasithea, Billings.' 1862. Palseoz. Foss., vol. I., p. 112. 



Corallum simple, conico-cylindrical, straight with periodic constrictions 

 that give it the appearance of being made up of a succession of short, 

 broad, truncated, invaginated cones with prominent angular upper mar- 

 gins, contracted, and rounded at the top, the whole surface regularly 

 marked by longitudinal septal grooves. Calyx, in the single specimen 

 representing the species, small, only 6 mm. in diameter, and about 4 mm. 

 deep, smooth and concave at the bottom, with steep sides on which the 

 septa appear. Tabula? varying from deeply concave to flat, with second- 

 ary convex tabula? or blisters, the whole forming a somewhat visicular 

 central area about 7 mm. broad. Septa about eighty-four in number, of 

 equal size, confined to the extratabulate zone, with close-set, strong, 

 straight carina? on their sides, three or four in the space of 1 mm., directed 

 obliquely downward and outward. Dissepiments arching upward and 

 outward in the interseptal loculi, at right angles to the direction of the 

 carina?, small, of rather equal size and often in as many as nine or ten 

 rows. 



The single specimen, the type of the species, is 21 mm. in maximum 

 breadth, 42 mm. long and is damaged at the basal end. 



Locality. — L'Anse a la Vieille, Baie des Chaleurs, Que., collected by 

 Sir W. E. Logan, 1843 ; Silurian. * 



Cyathophyllum Halli, Milne-Edwards and Haime. (Sp.) 



Strombodes helianthoides ? Hall. 1843. Geol. of New York, pt. IV., p. 209, fig. 3. 

 Heliophyllum Halli, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Palseoz., 

 p. 408, pi. 7., figs. 6, 6a, 6b ; and 1853, Brit. Foss. Corals, p. 235, 

 J pl. LI., fig. 3. 



*See foot-note p. 129. 



