30 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



lar, and the dichotomous branches often extending beyond and terminat- 

 ing in terete forms. Cells 48 or 60 in the space of an inch longitudi- 

 nally." (Hall). 



This species is represented in the survey collection by specimens from 

 Lake Temiscaming, Que., collected by Sir William Logan, in 1845, and 

 Dr. Robert Bell, in 1887. 



From an examination of the Canadian specimens it is seen that the 

 corallum is formed of a number of upright stems, with an average 

 diameter of 3'5 mm., growing closely together in an irregular manner 

 and frequently branching and anastomosing so as to form an obscurely 

 • reticulated mass. The corallites are almost vertical, or only slightly 

 inclined outward in the central part of the stems or branches, but near 

 their distal ends they bend rather abruptly outward so that the calyces 

 are almost at right angles to the surface. The walls of the corallites 

 become stouter as they approach the surface, where the maximum thick- 

 ness is attained. The calyces are rather irregularly disposed, not 

 arranged in definite rows, somewhat angular, wider than high, their 

 distance apart vertically being about equal to their width ; from '3 to 

 '5 mm. wide and about half as high. Tabulae and septa have not been 

 recognized, but comparatively large mural pores are seen to be present. 



Milne-Edwards and Haime, in their British Fossil Corals, p. 263, make 

 Cladopora muUipora, Hall synonymous with their species Alveolites f 

 seriatopor aides. This opinion, the writer is not fully prepared to follow, 

 and prefers, for the present at least, "to refer the Canadian specimens to 

 Hall's species. 



Locality. — Lake Temiscaming, Que. ; Niagara formation. 



Cladopora ckassa, Rominger. (Sp.) 



timaria crassa, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 44, pi. XVIII., 

 fig. I. 



Coral thinly incrusting, from 2 to 4 mm. thick, but at times 

 apparently thicker, due to the growth of one layer over the other, com- 

 posed of thin walled and sometimes slightly compressed, prostrate coral- 

 lites that bend upward to the surface with thickened walls and end in 

 moderately oblique, transversely subelliptical calyces with a not very 

 prominent lip on the upper edge. Calyces about -75 mm. in width and 

 slightly less from back to front, and separated from each other by an 

 average distance, due to the thickened walls at the surface, of -5 mm. 

 Sometimes by the growth of a layer on the basal surface of another, a 

 comparatively thick expansion is formed having calyces opening on either 



