iambe. ] CANADIAN PALAEOZOIC CORALS. 33 



Corallura ramose, reticulate or subpalmate ; branches or subdivisions 

 circular or oval in transverse section, varying in thickness from 3 to 

 about 8 mm. ; calyces oblique to the surface, slightly expanded, with the 

 outer edge produced into a strong projecting lip, subcircular sometimes 

 slightly broader than high, from about *3 to "5 mm. across; when the 

 surface is abraded the openings appear triangular and higher than broad 

 owing to the loss of the lip. The calyces are sometimes about their own 

 diameter apart, often closer. Corallites rounded polygonal or subcircular,. 

 their walls thickening gradually toward their distal ends. Mural pores 

 small, few in number, irregularly placed. What appear to be tabulae 

 have been observed in some specimens. Rominger mentions (op. cit.) 

 having seen longitudinal ridges in the interior of the corallites of this 

 species, as in Cladopora cryptodens, Billings, but they have not been 

 detected in the specimens that have come under the writer's notice. 



This species differs from Cladopora cryptodens, Billings, to which it is 

 most nearly allied, principally in the more slender form of the corallum 

 and in its more delicate structure. 



Occurs in the Corniferous limestone of Ontario ; a loose specimen was 

 collected by R. Bell, in 1886, on the Albany River which flows in the 

 latter part of its course through a large Devonian area. 



Cladopora Fischeri, Billings. (Sp.) 



Alveolites Fischeri, Billings. 1860. Canadian Journal, new series, vol. V., p. 256, fig. 6. 



ii M Nicholson. 1874. Palseon. of Ont., p. 57. 



Cladopora Fischeri, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 47, pi. 



XIX., figs. 1 and 4. 

 Pachypora Fischeri, Nicholson and Etheridge, jun. 1877. Jour. Linn. Soc, vol. XIII., 

 p. 362, pi. XX., figs. 18-20. 

 ., .. Nicholson. 1879. Palaeoz. Tab. Corals, p. 91, fig. 16. 



ti ii Whiteaves. 1889. Contr. to Can. Palason., vol. I., pt. II., p. 121. 



Corallum in the form of irregularly palmate or flabellate, thin expan- 

 sions, arising from a short, stout, stalk-like base and attaining to a con- 

 siderable size ; sometimes as much as 4 inches high, seldom more than 6 

 mm. thick and at times expanding above to a breadth of about 3 inches. 

 Corallites irregularly polygonal, having an average diameter of about *5 

 mm. but varying considerably in size, with moderately thin walls that 

 exhibit a gradual thickening toward the calyces. The corallites bend 

 outward and upward, as in other species of this genus having a palmate 

 or flabellate corallum, from a central axial plane and issue obliquely to 

 the surface on both sides of the expansion. Calyces, with an average 

 breadth of about *75 mm., circular, transversely oval, semicircular or reni- 

 form, with the lower edge produced so as to form a sharp-edged lip ; 

 3 



