180 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



with the elongated type form already described are shorter conical speci- 

 mens, with broad, expanded calyx margins, and generally with a very 

 prominent bottom, covered by twisted radial crests, seeming to be a mere 

 variety of the former kind. 



" Occurs in the Niagara group of Drummond's Island." 



Omphyma Eriphyle, Billings. (Sp.) 

 Plate XV. figs. 2, 2a, 2b. 



? Omphyma subturbinata, Milne-Edwards and Haime. 1855. Brit. Foss. Corals, p. 288, 



pi. LXVIII. figs. 1, la-c. 

 Cyathophyllum Eriphyle, Billings. 1862. Palseoz. Foss. vol. I, p. 111. 

 Omphyma Eriphyle, Lambe. 1899. Ottawa Naturalist, vol. XII, p. 243. 



"Corallum simple, large, cylindro-turbinate. Outer surface marked 

 transversely with shallow constrictions alternating with low growth- 

 swellings, 5 or 6 mm. broad, representing successive calicular margins. 

 Epitheca thin, with numerous transverse growth lines and longitudinal 

 depressed linear markings 2 or 3 mm. apart. Internal structure, as 

 viewed in longitudinal and transverse sections, composed of a central 

 tabulate area, about one-third the diameter of the corallite, surrounded 

 by a broad vesicular zone. Tabulae flat, close set, moderately regular, 

 sometimes anastomosing, about twelve in a space of 1 cent. Vesicles 

 unequal in size, from 1 or 2 mm. to over 1 cent, in length, made up of 

 arched plates curving upward and outward. The tabuke are at intervals 

 continued obliquely outward over the vesicles so as to form in reality a 

 succession of invaginated cups flat at the bottom with dilated convex 

 sides. Septa discontinuous vertically, formed by the infolding of the 

 sides of the cups, broad and angular at the periphery, becoming lamellar 

 within, not encroaching on the tabulate area, numbering about eighty, and 

 apparently of equal length. Calyx moderately deep. Length from 10 to 

 25 cent., diameter from 5 to 6 5 cent." (Lambe, 1899.) 



Locality. — L'Anse a la Vieille, Baie des Chaleurs, collected by Sir W. E. 

 Logan in 1843; Silurian. 



Genus Arachnophyllum, Dana. 1846. 



Arachnophyllum, Dana. 1846. Am. Jour. Sci. and Arts, 2nd series, vol L, p. 186. 

 Astrceophyllum, Nicholson and Hinde. 1874. Canadian Journal, new series, vol. XIV. 



p. 152. 

 ? Vcsicularia, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 134. 



Corallum comp >site, with a basal epithecal covering. Corallites up- 

 right, confluent, each consisting of a series of invaginated calyces whose 



