REPORT ON SOME FOSSILS COLLECTED O THE MTHWEST 



TERRITORY, CAXADA, BY NATURALISTS FROM 



THE UNIVERSITY OF IOWA. 



By S. CALVIX, 



A party of students under the direction of Professor C. C. 

 Nutting, of the University of Iowa, spent the summer of 1891 

 collecting specimens of Natural History in the territory of the 

 Hudson Bay Company, north of Lake Winnipeg. In the 

 part of the collection submitted to me are some interesting 

 geologic specimens, embracing fragments of a light-colored, 

 fine grained dolomite, together with representatives of two 

 species of Favosites, two Cyathophylloid corals one of which 

 is probably a Streptelasma, and one species of Peniamcrns. 

 As usual in dolomitic limestone the fossils, when not silicified, 

 are preserved as casts, and for this reason the specific rela- 

 tions of the corals cannot be definitely determined. One 

 species of Favosites however, is not distinguishable from casts 

 of a small-celled variety of Favosites favosus Goldfuss, a 

 variety that has frequently been referred to F. niagarensis 

 Hall. The other has corallites about the size of those of F. 

 hisfidns Rominger. 



The Penta7jierns, which is an exceedingly interesting, svm- 

 metrical species, was described by Mr. J. F. Whiteaves, Pale- 

 ontologist of the Canadian Geological Survey, in the Canadian 

 Record of Science for April, 1891, under the name Pentamerus 

 dccussatus. It is about as large as P. ohlongus Sowerby, and 

 like that species is very variable in shape and size. Like P. 



