162 



liOwer Fort Garry (St. Andrews), Dr. R. Bell, 1880 : one specimen, 

 associated with the preceding species and Montioulipora Wetherbyi, Ulrich. 



PHyLLOPORiNA Teentonensis, Nicholson. (Sp.) 



Retepora Trentonensis, Nicholson 1875. Geo). Mag., vol. II., p. 37; and Rep. 



Pal. Prov. Ont., p. IS, pi. 2, figs. 4, and 

 4, a-b. 



II II Whiteaves 1881. Geol. Surv. Canada, Rep. Progr. 



1879-80, p. 58c. 

 Phylloporina Trentonensis, Vlrich 1889. Geol. Surv. Canada, Contr. Micro- 

 Pal. Cambro-Silur. rocks, etc., p. 47. 



,1 1890. Geol. Surv. Illinois, vol. VIII, p. 



639, pi. 53, figs. 1, and 1, a-c. 



Lower Fort Garry (St. Andrews), Dr. R. Bell, 1880 : one good specimen. 

 Phtliopoeina. (Species undeterminable.) 



Lower Fort Garry, D. B. Dowling, 1881 : a fragment of the lower 

 portion of the zoarium of a species which is apparently distinct from P. 

 Trentonensis, and which may be undescribed. Mr. Ulrich, who has 

 examined this specimen, writes as follows in regard to it : — " On compari- 

 son with my P. variolata, which it resembles most, it proves to be a 

 stronger species, with larger and even more irregular fenestrules. It is 

 much stronger and much less regularly fenestrated than P. reticulata, 

 Hall. The position of the species seems to be intermediate between the 

 Black River P. Halli, Ulrich (a species with stronger branches and more 

 rounded fenestrules) and the Cincinnati P. variolata. P. Trentonensis, 

 Nicholson, belongs to quite a difierent section of the genus." 



MoNTicuLiPOEA Wetherbyi, Ulrich. 



Monticulipora Wetherbyi, Ulrich 1882. Journ. Cincinn. See. IKat. Hist., vol. 



v., p. 239, pi. 10, figs. 4-4 6. 

 n M II 1889. Geol. Surv. Canada, Contr. Micro- 



Pal. Cambro-Silur. rooks, etc., pt. 2, p. 30. 



II 1893. Lower Silur. Bryoz. Minn., p. 218, 



pi. 15, figs. 7 and 8. 



Lower Fort Garry (St. Andrews), Dr. R. Bell, 1880 : two specimens 

 growing upon the zoarium of Pachydictya magnipora. 



Mesotrypa Selkirkensis. (N. Sp.) 



Plate 19, figs. 1 and 1 o. 



Zoarium forming expansions of as much as lialf an inch in thickness : 

 surface characters unknown, the few specimens yet collected being buried 

 in the matrix, with only the broken edges exposed. Zooeoia, as seen in 



