""BE. J CANADIAN PALEOZOIC COEALS. 125 



fractured by the pressure to which the corallum has been subjected, 

 apparently well developed, flat and extending from wall to wall. 



Locality.— Mount Joli, near Percd Que., one specimen collected by Sir 

 Wm. Logan ; Gasp^ limestone No. 8 which according to E. Billings is 

 about the age of the Oriskany sandstone. 



Zaphrbntis gigantba, Lesueur. (Sp.) 

 Plate IX., figs. 3, 3a. 



CaryophylUa giffantea, liesneur. 1820. Mem. du Mus., t. VI., p. 296. 



Zaphrentis gigantea, Milne-Edwards and Haime. 1851. Polyp. Toss, des Terr. Paleeoz., 



p. 340, pi. 4., figs. 1, la— c. 

 ■I M Billings. 1859. Canadian Journal, new series, vol. IV"., p. 121. 



Nicholson. 1874. Palieon. of Ont., p. 22, pi. III., figs. 1, la. 

 Zaphrentis Eriphyle, fillings. 1874. Canadian Naturalist, new series, vol. VII., p. 233. 

 Zaphrentis Her.uba, Billings. 1874. Ibid., p. 234. 

 Zaphrentis gigantea, Rominger. 1876. Geol. Sur. Mich., Poss. Corals, p. 145, pi. LII. 



Lambe. 1899. Ottawa Naturalist, vol. XII. , p. 252. 



" 'Polypier cylindro-conique, tres-long, a bourrelets d'accroissement 

 larges et peu saillants; fossette septaleproportionnellementunpeu petite, 

 situde tres-pr^s de la murailie; au moins 70 cloisons ^gales, minces, 

 arrivant sur la partie superieure des planchers jusqu'a une petite distance 

 du centre, oii elles sont Mg^rement flexueuses ; un ^gal nombre de cloisons 

 rudimentaires ; planchers tres-grands, envahissant les loges intercloison- 

 naires, ou Ton ne voit pas de traverses v^siculeuses ind^pendantes, et 

 lisses en dessous dans une grande ^teudue. La longueur est frequemment 

 de 40 a 50 centimetres ou meme plus, le diam^tre du calice de 7 ou 8' 

 (Milne-Edwards and Haime). 



" The description given by Rominger of this species is a thorough and 

 accurate one, and makes allowance for the variations that exist in this in 

 common with many other species ; it appears in the following words : — 

 ' Conico-cylindrical, horn-shaped polyparia, attaining in some specimens a 

 size of two and a half feet in length, by a diameter of three inches. Some 

 enlarge their diameter rapidly to a certain thickness, and then grow on 

 in a uniformly cylindrical shape ; others are in the young state, slender, 

 flexuose, and irregularly constricted stems, and grow gradually to larger 

 diameters. The surface of the polyparia is covered by an epitheca with 

 shallow annular wrinkles of growth, and longitudinally ribbed by septal 

 striae, which, however, are not in all specimens equally distinct. Calyces 

 spacious, with erect walls, and acute, wedge-like margins ; bottom broad, 

 marginally depressed and flat in the centre. In one place of the circum- 

 ference the diaphragms are more deeply depressed by a septal fovea. 

 Radial lamellas stout, linear, alternately long and short, but appearing 



