THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



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



Soiiio Radiolaria fnmi Maiiitoha- Mostly New. 



[.•Abstract from a rciiort of the Canadian ( leoiogical Survey.] 

 WITH FRONTISPIECE. 



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

 described by Dr. Riist, of irianover, 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 loi^ S ) . 



At an elevation of 1,450 teet 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, repiesenting 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: LiospH.KRin.\. 

 I. Caryosphajra a;quidistans, n. sp. Very rare. 



Family : Ellipsida. 

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

 Family : Dkuim'ULIda. 



3. Prunulum calococcus, ti. sp. Rare. 



Family : Cyktoc.m.pida. 



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



