iamk.] CANADIAN PALiEOZOIC CORALS. 57 



The corallites of this species are as a rule moderately straight and 

 seldom approach each other close enough to be in contact, they are con- 

 nected together by straight tubes of about half the thickness of the coral- 

 lites themselves, and are frequently deeply constricted at intervals of 

 about 1-2 mm., sometimes more and often less. In some specimens 

 the corallites are often two lines apart. 



From different specimens in the survey collection it is seen that the 

 base of the corallum may consist of an open reticulation of prostrate 

 corallites, or that the corallites, diverging from one or more centres and 

 closely packed together in one plane, may form a single undulating leaf- 

 like horizontal basal expansion, with at times secondary ones parallel to 

 and at no great distance above the main one. Dr. Rominger figures* a 

 portion of the latter form of basal expansiou of this species ; the sudden 

 up-bending of the corallites is well shown. 



The name of this species was changed by Mr. Billings from S. elegans 

 to S. perelegans, the former name being preoccupied, as stated in a foot- 

 note on page 117 of volume IV, of the Canadian Journal. 



This species differs from S. Maclurei in having corallites that are 

 slenderer, much more strongly annulated, straighter and therefore more 

 nearly parallel to each other, and in having the connecting tubes more 

 highly developed. Dr. Nicholson considers it to be nearly related! to S. 

 reticulata, Goldfuss, from the Carboniferous rocks of Europe. 



Devonian. — Abundant in the Corniferous limestone of Ontario. 

 Long Portage, Missinaibi River to Moose River (Corniferous), R. 

 Bell, 1877. 



Syringopora Hisingeri, Billings. 



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

 p. 172. 

 ii ti Billings. 1859. Canadian Journal, new series, vol. IV., p. 116, 



fig. 18. 

 Aulopora filiformis, Billings. 1859. Canadian Journal, new series, vol. IV., p. 119, 



(not of Nicholson.) 

 Syringopora Hisingeri, Billings. 18G3. Geology of Canada, p. 366, fig. 367. 

 -i ii Nicholson. 1874. Palaeon. of Ont., p. 40. 



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



XXXII. 

 Aulopora filiformis, Whiteaves. 1891. Contr. to Can. Palseon, vol. 1, pt. III., p. 211, 

 pi. XXIX., fig. 1. 



" This species forms large masses of very long, nearly parallel or 

 slightly varying, slender corallites, which are closely aggregated and 



*Op. cit vide supra, fig. 2. 

 t Palaeontology of Ontario, p. 41. 1874. 



