iambe ] CANADIAN PALAEOZOIC CORALS. 81 



are slightly exsert, their edges appearing at the surface as well marked 

 rings a little above the level of the intervening tubular areas. This 

 species is distinguished from others of the genus by its small and rather 

 distant coral] ites. 



H. subtubulata occurs in the Niagara formation and the Lower Hel- 

 derberg group ; in the Niagara at the north end of Lake Temiscaming, 

 Que., collected by R. Bell, 1887, and at " The Jumpers," division IV., 

 Anticosti Group, Anticosti, J. Richardson, 1856; in the Lower Helder- 

 berg at l'Anse a la Barbe, Baie des Chaleurs, W. E. Logan, 1843 ; west 

 of l'Anse a la Barbe, J. Richardson ; at l'Anse a la Vieille, Baie des 

 Chaleurs, 1 J. Richardson, and at the same locality, R. Bell, 1862. A 

 poorly preserved specimen from the Niagara of Owen Sound, Ont., col- 

 lected by J. Townsend in 1874, appears to belong to this species. 

 Rominger records the occurrence of this species in the Niagara of Point 

 Detour and Drummond Island, Lake Huron. 



Heliolites inordinata, Lonsdale. (Sp.) 



Porites inordinata, Lonsdale. 1839. In Murchison, Silur. Syst., p. 687, pi. 16 bis, 



figs. 12, 12 a—c. 

 Heliolites inordinata, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Palae'oz, 



p. 217. 

 .. m Milne-Edwards and Haime. 1855. Brit. Foss. Corals, p. 253, 



pi. LViL, figs. 7, 7a. 



Corallum ramose or lobate, with branches or lobes circular or oval in 

 section, from 3 or 4 mm. to nearly 2 cent in diameter, proceeding from a 

 massive base. The generality of specimens usually consists of fragments 

 of branches from the upper part of the corallum, but one specimen in the 

 collection shows that the basal part may be massive, with branches or 

 lobate processes of considerable thickness springing therefrom. Corallites 

 circular, about 1*5 mm. in diameter, seldom more than 1 mm. apart, often 

 much closer, with twelve septa reaching to the centre. Interstitial tubules 

 polygonal, three or four in a ^pace of 1 mm. In the branches the coral- 

 lites and tubules diverge from an imaginary central axis, terminating 

 either at right angles or slightly inclined to the surface, in which latter 

 case the calyces are rather oval than circular, the lengthening taking place 

 in the longitudinal direction of the branch. Tabulae horizontal, in the 

 tubules four or five occur in a space of 1 mm., but in the corallites they are 

 not quite so close set. 



H. inordinata is distinguished from other species of the genus principally 

 by its ramose form. 



6 r— 4 



