228 Canadian Record of Science. 



Rep. Geol. Nat. Hist. Surv. Minn., Minneapolis, 1886, p. 

 100," the following remark is made : " The same species 

 apparently occurs at Ottawa, Canada." From this state- 

 ment I would conclude that Prof. Ulrich has amongst his 

 material from Ottawa a form which he refers with a cer- 

 tain amount of uncertainty to the above species. 



XVIII. Genus Hemiphragma, Ulrich. 



29. Hemiphragma Ottawaense, Foord. This species was 

 first described by Foord 1 as Batostoma Ottawaense from 

 the Black River and Trenton formations of Canada in the 

 Ottawa River Valley. 



XIX. Genus Monotrypa, Nicholson. 



30. Monotrypa undulata, Nicholson. This species is the 

 type of the genus Monotrypa (pars), Nicholson, as restricted 

 by Prof. Ulrich. In has been recorded from Canada, from 

 the Lorraine (= Hudson River) rocks of Toronto and other 

 localities in Canada. 



31. Monotrypa (? Chwtetes) cumulata, Ulrich. This 

 species is for the firftt time described by Prof. Ulrich in 

 this interesting memoir on pp. 307 and 308, and is recorded 

 from the " Trenton limestone of Canada." 



XX. Genus Bythotrypa, Ulrich. 



32. Bythotrypa laxata, Ulrich. This species was first 

 described and recorded from the Trenton formation of St. 

 Andrews, Manitoba, Canada, in " Contrib. Micro-Pal. 

 Cambr.-Sil. Rocks Can., 1889, part II, p. 3*7." It was there 

 doubtfully referred to the genus Fistulipora, but on examin- 

 ing large collections of the species Ulrich was led to regard 

 this a new genus, which he founded upon this species as the 

 type, a prototype of Fistulipora and gave it a new generic 

 designation. 



XXI. Genus Diamesopora, Hall. 



33. Diamesopora Trentonensis, Ulrich. From the Trenton 

 limestone at Ottawa, Canada. 



The text is accompanied by twenty-eight full page quarto 



1 Contrib. Micro-Pal. Cambro-Silur. Rocks Canada, Cttawa, 1883, p, 18. 



