lambe. ] CANADIAN PALEOZOIC CORALS. 59 



immersed in acid, it was found impracticable to obtain a longitudinal sec- 

 tion of them. The presence alone of transverse bars connecting adjacent 

 corallites would probably justify, without further corroboration, the con- 

 clusion that in Aulopora filiformis we have a true Syringopora. 



A comparison of the basal reticulation of one of the types of Syringopora 

 Hisingeri, Billings, with the type of A. filiformis, shows the resemblance 

 between the two to be so strong as to scarcely leave any doubt as to their 

 being specifically identical. 



That A. filiformis, Billings, is in all probability a Syringopora was 

 first suggested by Mr. Whiteaves in 1891 (op. cit. p. 211). At this time, 

 in describing Hederella Canadensis, Nicholson, he had occasion to refer 

 to A filiformis, Billings, and in connection with the latter species remarks 

 that it appears to him " to be the immature state of a species of Syringo- 

 pora." 



The type specimen of A. filiformis bears the label Rama's Farm, Port 

 Col borne, Ont., Corniferous limestone ; E. Billings. 



Syringopora nobilis, Billings. 



Syringopora nobilis, Billings. 1858. Rep. of Progress for 1857, Geol. Survey of Canada, 

 p. 171. 

 " it Billings. 1859. Canadian Journal, new series, vol. IV., p. 118. 



ti ii Nicholson. 1874. Palaeon. of Ont., p. 40. 



H it Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 84, pi. 



XXXII. 

 Whiteaves. 1889. Contr. to Can. Pal., vol. I., pt. II., p. 120. 



The original description of this species is as follows — "Corallites three 

 lines in diameter, distant two to four lines. The connecting processes in 

 this species have not been observed, but the size of the corallites is quite 

 sufficient to separate it from any known species." In 1859, Mr. Billings 

 (Can. Jour., vol. IV.) further says " This species is distinguished from all 

 others of the genus by the great size of the corallites, which sometimes 

 attain the diameter of five lines. In the young state the form is that of 

 an Aulopora, but the adult specimens have branches three or more inches 

 in length, with an internal arrangement of infundibuliform diaphragms, 

 which are so blended together as to produce a structure somewhat similar 

 to the vesicular tissue of the genus Cystiphyllum. The external wall is 

 thick and rather strongly annulated." 



Nicholson in the Palaeontology of Ontario refers to this species in the 

 following words — " Corallum lax, spreading, increasing by the pro- 

 duction of lateral buds. Corallites very large, varying with age from one 

 and a half to five lines in diameter, apparently not connected by trans- 

 verse processes. Septa obsolete ; tabulae infundibuliform. Epitheca- 



