192 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



centre being comparatively horizontal and frequently larger in size. In 

 a longitudinal section the calycinal spinules are represented by faint, 

 short, linear markings at right angles to the direction of the vesicles. In 

 a transverse section the septal ribs appear as concentric cycles of inward- 

 ly directed short prolongations from the cut edges of the vesicles, the 

 whole having the appearance of indistinct interrupted septa converging 

 from the periphery toward the centre. 



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

 Logan, in 1843. Silurian. One specimen, apparently distorted by lateral 

 pressure. 



Cystiphyllum vesiculosa, Goldfuss. (Sp.) 



Cyathophyllum vcsiculosum, Goldfuss. 1826. Petre facta Germanise, vol. I., p. 58, pi. XVII., 



figs. 5a-e, and pi. XVIII, figs, la- d. 

 Cystiphyllum cylindricum, Hall. 1843. Geol. of New York, pt. IV., p. 209, figs. 1, 2. Non 



Lonsdale. 

 Cystiphyllum vcsiculosum, Milne- Edwards and Hainie. 1851. Polyp. Foss. des Terr. 

 Palaeoz., p. 462 ; and 1853, Brit. Foss. Corals, p. 243, pi. LVL, 

 figs. 1, la, lb. 

 Cystiphyllum Americanum, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Pal- 



aeoz., p. 464, pi. 13, figs. 4, 4a. 

 Cystiphyllum Senccacnse, Billings. 1859. Canadian Journal, new series, vol. IV, p. 137. 

 Cystiphyllum grande ?, Billings. 1859. Ibid, p. 139. 

 Cystiphyllum Americanum, Billings. 1859. Ibid, p. 139. 



» ti Nicholson. 1874. Palaeon. of Ont., p. 36, pi. VI., fig. 8 ; and 



C. vesiculosum, Nicholson, 1874, ibid, p. 37, fig. 8. 

 Cystiphyllum superbum, Nicholson. 1875. Palaeon. of Ont., p. 73, pi. I., fig. 1. 

 Cystiphyllum Americanum, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 137, pi. L., 

 upper row and right-hand half of lower row. 

 Hall. 1876. Illus. Dev. Foss., pi. XXVIII. , figs. 1-7. 

 Cystiphyllum vcsiculosum, Lambe. 1899. Ottawa Naturalist, vol. XII., p. 257. 



" Corallum simple, varying from turbinate to conico-cylindrical, pointed 

 at the base, straight or^curved, flexuous or geniculated, sometimes long 

 and slender, at other times comparatively short and thick. Annulated 

 by growth expansions and constrictions, in some specimens much more 

 pronounced than in others, frequently contracted at the calicular end. 

 Epitheca complete, thin, showing minor rings of growth, the whole marked 

 by fine transverse lines of which, in well preserved specimens, as many as 

 twenty-four can be counted in a space of 2 mm.; faint longitudinal 

 indications of linear septal markings are also not infrequently developed. 

 Calyx of variable depth, in short, turbinate coralla comparatively shallow, 

 often with broad margins, in more cylindrical forms generally somewhat 

 deeper in proportion to the diameter and with steeper sides. Surface of 

 calyx blistered and often marked radially by interrupted, more or less 

 distinct, superficial septal ridges. Inner "structure entirely vesiculose, 

 composed of convex blister-like plates resting on each other and directed 



