﻿Canadian Stromatoporoids. 133 



Ellis) Bay, Anticosti. Professor A. Hyatt, who has 

 collected many specimens of B. nodtdosa at various 

 localities on the same island, says that the size of the 

 species, " as nearly as could be inferred from fragments, is 

 not over four feet long, by from three to five inches 

 in diameter at the larger end." To the naked eye some of 

 the specimens look as if they were encrusted by a parasitic 

 species of Zahechia. 



A silicified specimen which appears to be referable to 

 this species, though its internal structure is almost 

 obliterated, was collected by Mr. Weston in 1884 from the 

 upper beds of the Hudson Eiver formation at Stony 

 Mountain, Manitoba. 



Beatrice A. undulata, Billings. 



Beatricea imdidata, Billings. 1857. Geol. Surv. Canada, 

 Eep. Progr. 1853-56, p. 344. 

 " Hyatt. 1865. Amer. Journ. Sc, vol. 



XXXIX., p. 266. 



Billings. 1865. Can. Nat. and Geol., 



ser. 2, vol. XL, p. 405, fig. 1. 



Nicholson. 1886. Mon. Brit. Stroma- 



top., pt. 1, pp. 86 and 89. 



Numerous specimens of this remarkable fossil were 



collected from the Hudson Eiver formation and from 



Divisions 1 and 2 of the Anticosti group, at several 



localities on the island of Anticosti, by Mr. J. Eichardson 



in 1856, by Messrs. Verrill, Shaler and Hyatt in 1861, and 



by Mr. Weston in 1865. Characteristic examples of 



B. imdidata have since been collected from the Hudson 



Eiver formation at Snake Island, Lake St. John, P.Q., by 



Mr. Eichardson in 1857 ; at Eabbit and Club islands. Lake 



Huron, by Dr. E. Bell in 1859 ; and in the " Upper beds" 



at Stony Mountain, Manitoba, by T. C. Weston, and A. 



McCharles in 1884. A specimen in the Museum of the 



Geological Survey at Ottawa, collected by Mr. Eichardson 



