158 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



mm. in thickness) than those figured by Milne-Edwards and Haime, with 

 which they agree, however, in their manner of increase, viz. gemmation 

 from the sides or from the connecting processes. According to Dr. Rom- 

 inger the increase is by prolific calycinal budding, a feature not shown by 

 the Ontario specimens, which, nevertheless, correspond in other particu- 

 lars with Rominger's description and figure of specimens from the Niag- 

 ara group of Indiana and Kentucky. 



Localities. — One specimen from Cabot's Head, Georgian Bay, collected 

 by A. Murray : another from the county of Grey, township of St. Vin- 

 cent, lot 28, concession 9, collected by A. S. Cochrane in 1885. Niagara 

 group. 



DlPHYPHYLLUM OESPITOSUM, Hall. (Sp.) 



Plate XIII., figs. 3, 3a, 3b. 



Diplophyllum ccespitoxum, Hall. 1852. Pakeon. New York, vol. II., p. 116, pi. 



32, figs, la— r. 

 Cyathophyllum pelagicum, Billings. 1862. Paloeoz. Foss., vol. I., p. 108. 



" " Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 34. 



Diphyphyllum ccespitosum, Nicholson. 1875. Palseon. of Ont., p. 59. 



" " Lambe. 1899. Ottawa Naturalist, vol. XII., p. 240. 



" Corallum aggregate, composed of upright, slender, flexuous, cylindri- 

 cal corallites, increasing by lateral gemmation and forming large colonies. 

 Corallites varying in diameter from about 5 to 8 mm., frequently touch- 

 ing each other, covered by an epitheca marked annularly by fine growth 

 lines and longitudinally by faint septal striae. Septa of two sizes alter- 

 nating with each other, the primaries almost reaching the centre, the 

 secondaries about half the length of the primaries, averaging in number, 

 according to the size of the corallite, from about forty to fifty in all. 

 Dissepiments arching upward, between the septa, against the outside 

 wall, generally in a single series, their cut edges, as seen in trans- 

 verse section, assuming the appearance of an inner wall situate less than 

 1 mm. from the wall proper. Tabulae large, numerous, stretching across 

 the visceral chamber so as to reach the dissepimental zone on either side, 

 fiat or slightly concave at the centre, deflected downward near the peri- 

 phery, about ten occurring in a space of 5 mm. 



" Locality. — Becscie River Bay, Anticosti, division II., Anticosti group, 

 collected by J. Richardson in 1856; according to Billings the colonies 

 measure from 6 to 15 inches in diameter. 



" Professor Nicholson mentions this species as occurring abundantly 

 and in large masses in the Niagara limestone of Thorold, Ont. (op. 

 ^cit. p. 59)." (Lambe, 1899.) 



