28 The Ottawa Naturalist. [April 



of connecting anns typical of the genus. Nothing is presented 

 by such sections beyond the cut ends of the pillars, and the 

 obliquely severed upturned edges of the laminae. Typical 

 examples are easily distinguished from A. teniiifilatum, but 

 intermediate forms connect the two species, so that one is tempted 

 to regard the examples under discussion as representing a 

 variety only of the latter species. 



Localities. — Pagwachuan River, Station 641, V7. J. Wilson, 

 July, 1904; Pagwachuan Ri^•er near mouth, W. J. Wilson, 

 July, 1904; Little Current River, 17 miles from mouth, July, 

 1903. 



Stromatopora constellata. Hall. 



The specimens listed below appear to be identical with 

 5. hudsonica, Dawson. In the writer's opinion this species is 

 indistinguishable from Hall's type, and therefore his name 

 should have precedence. 



Localities. — Equan River, D. B. Downing, Little Current 

 River, Station 67, W. J. Wilson. July, 1903. 



Stromatopora carter:, Nich. 



In his description of this species Nicholson states that he 

 identifies one specimen from a boulder on Hayes River. There 

 can be little doubt that the present example is also referable to 

 the same species. The coenosteum shows the same irregular 

 shape, astrorhizae are feeble or wanting, and the character of 

 the reticulation is the same. The only difference is that the 

 horizontal elements show more persistency than Nicholson's 

 figures suggest. The specimen is not well enough preserved to 

 reveal the tabulae of the zooidal tubes. 



Locality. — Pagwachuan River, Station 641, W. J. Wilson, 

 July, 1904. 



Stromatopora wilsoni, sp. nov. 



This species is founded on a poorly preserved specimen, 

 but one which presents features rendering it impossible to 

 ascribe it to any known species. The coenosteum is irregular 

 and botryoidal in its manner of growth, and the surface is with- 

 out mamelons. Astrorhizal systems are poorly developed and 

 do not seem to be superimposed. The skeletal fibre is minutely 

 fibrous, and the character of the reticulation like that of S. 

 carteri but much finer. 



Vertical sections show both pillars and laminae to be fairlv 

 persistent, but absolutely fused after the manner of true Stro- 

 matopora. About four laminae and five or six pillars occur in 

 the space of one mm. The specimen is too badly preserved to 

 show the tabulae of the zooidal tubes. 



