Canadian Fossil Bryozoa. 227 



XV. Genus Mesotrypa, Ulrich. 



This genus was been founded to receive a number of forms 

 usually referred to the genus Diplotrypa by Foord, Nichol- 

 son, Ami and Ulrich himself. The following species of 

 Mesotrypa from Canada are recorded: 



24. Mesotrypa Quebeoensis, Ami (fig. 15e and /, p. 248.) 

 The type of this species described by the writer l from the 

 hard compact and indurated limestone bands of Cote 

 d'Abraham, Quebec City, Canada, is here recorded (p. 259) 

 from the Galena shales at Decorah, Iowa, also from "shales 

 of the Trenton group at Burgin and Danville, Kentucky," 

 and also from " the Trenton limestone at Trenton Falls, 

 New York." 



25. Mesotrypa Whiteavesi, Nicholson, sp. (fig. 15# and K). 

 This species was originally described from the Trenton 

 limestone of Peterboro, Ont., Canada, and is here referred 

 by Prof. Ulrich for the first time to his new genus Meso- 

 trypa. Since this species was described by Nicholson, Foord 

 and others have discovered it in other localities in Canada, 

 including Ottawa, Ont., and Hull, Que., in the Trenton 

 limestone of both localities. 



Besides the above species of Mesotrypa Ulrich mentions 

 casually, but does not describe elaborately, as in other cases, 

 the following species from Canada : 



26. Mesotrypa regularis, Foord. This species was de- 

 scribed in Contrib. Micro-Pal. Cambro-Silur. Rocks, Can., 

 pp. 13 and 14, and obtained by Mr. Thomas C. Weston in 

 the " Trenton formation at Ottawa." 



XVI. Genus Eridotrypa, Ulrich. 



27. Eridotrypa mutabilis, Ulrich. Recorded by Ulrich 

 from the Trenton limestone of Ottawa, Canada, and from a 

 large number of localities in Wisconsin, Iowa, Tennessee, 

 Kentucky and Minnesota. 



XVII. Genus Callopora, Hall. 



28. Callopora multitabulota, Ulrich. Of this species, 

 which Mr. Ulrich first described in the " Fourteenth Ann. 



1 Can. Record of Science, Montreal, April, 1892, p. 101. 



