130 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



The manner of gemmation is shown in one specimen in which a small 

 bud, about two lines in diameter and of the same length, is produced in 

 one of the calicular expansions at a distance of over 2 inches below the 

 broken upper end of the parent. 



On the same tablet with the type specimen is a small fragment, slit 

 longitudinally, in which the tabulae are deeply concave at the centre and 

 turned down at the edges and the primary septa, as seen in a transverse 

 section, extend about half way to the centre, partly as carina? on the 

 tabuhe, and number about forty-seven, making the total number of septa 

 ninety-four. 



Amplexus Yandelli, Milne-Edwards and Haime. 

 Plate IX., figs. 4, 4a, 4b. 



Amplexus Yandelli, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Palaeoz., 



p. 314, pi. 3, figs. 2, 2a. 

 .. n Billings. 1859. Canadian Journal, new series, vol. IV., p. 123. 



Nicholson. 1874. Palaeon. of Out., p. 31. 

 it ii Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 154, pi. LIV., 



lower row. 



Original description. — " Polypier tres-long, cylindroide, irregulierement 

 contourne, montrant des bourrelets d'accroissement et des retrecissements 

 bien marques. Calice mediocrement profond ; le plancher superieur lisse 

 dans une grande etendue. Fossette septale profonde, arrondie, tres-rap 

 prochee de la circonference. Soixante-seize cloisons, alternativement 

 plus grandes et plus petites, minces, droites, tres-etroites. Longeur 7 

 centimetres, diametre du calice 15. 



"Devonien. Ameriquz du Nord : chutes de l'Ohio" (Milne-Edwards 

 and Haime). 



The coral that has been identified with this species occurs in the Corni- 

 ferous formation near Woodstock, Ont. There are three small specimens 

 in the collection, the largest of which is 6 cent, long with a diameter near 

 the upper end of 13 mm.; their form and structure is as follows: — 

 Corallum simple, nearly cylindrical, increasing very slowly in diameter, 

 irregularly curved or flexuous, annulated by ridges of growth, or frill-like 

 expansions, that are at unequal distances apart and of varying prominence. 

 Wall thin, covered by an epitheca that is conspicuously marked longi- 

 tudinally by septal furrows of the same size and transversely by minor 

 growth lines of unequal strength. Tabulae stretching from side to side, 

 flat, turned down at the edges, 1 or 2 mm. apart. Septa from about fifty 

 to sixty in number, of two sizes alternating, the primaries 2 mm. long 

 and denticulated on their inner edges, the secondaries represented only 

 by uniserial rows of small, rather sharply pointed tubercles. 



