THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL, 



Vol. XIV. APRIL, 1893. No. 4. 



Some Radiolaria from Manitoba— Mostly New. 



[Abstract from a report of the Canadian Geoiogical Survey.] 

 WITH FRONTISPIECE. 



Of i6 species herein enumerated, 13 are new and have been 

 described bv Dr. Riist, of Hanover, Germany. They come from 

 a locality situated on the south side of the gorge of Bell river, 

 in the eastern face of Porcupine mountain, near the extreme 

 northwestern corner of Manitoba (north latitude 52° 35', west 

 longitude toi° S'). 



At an elevation of 1,450 feet above the sea, on the north side of 

 the river, a somewhat slidden hillside shows, to a height of thirty 

 feet, a scarped face of dark gray clay shales, representing a hori- 

 zon very near the base of the Pierre formation. Thirty-five feet 

 higher up the bank, and on the south side of the river, is an out- 

 crop of light grav hard siliceous clay shale, associated with a few 

 dark nodules of ironstone. Specimens of this shale were col- 

 lected and brought to the Museum of the Geological Survey at 

 Ottawa, and on being submitted to a microscopical examination 

 were found to contain large numbers of well-preserved Radio- 

 laria. 



The geological formations contiguous have been described by 

 Prof. J. B. Tyrrell in the same report. The following brief de- 

 scriptions and figures will be sufficient for identifying the species. 

 The dimensions of each species are also published in the report. 

 The classification is as follows : 



Family : LiosPHyERiDA. 



1. Caryosphsei'a aequidistans, n. sp. Very rare. 



Family : Ellipsida. 



2. Cenellipsis hexagonalis, n. sp. Not frequent. 



Family : Druppulida. 



3. Prunulum calococcus, n. sp. Rare. 



Family: Cyrtocai^pida. 



4. Cyrtocalpis crassitestata, n, sp. Not frequent. 



