94 



The Fauna of the Magnesian Series. 



dolomitized shell rarely occurs. The Brachiopoda more often 

 have their shells preserved and can thus, like the silicified 

 casts of molluscs, be found even where the reduction of the 

 strata has obliterated the hollow casts. Such obliteration 

 is often noted in theShakopeeandOneota, and very frequent- 

 ly in the Jordan and Saint Lawrence. 



The following table shows the distribution in vertical 

 range of the species collected, and following it are notes upon 

 and decscriptions of the same. 



Table of Fossils Identified from the 

 Magnesian Series. 



Asaphus sp 



Dikelocephalus minnesotetisis Owen. 



Lingula aurora Hall 



Lingula dolata n. sp 



Lingula mosia Hail 



Lingula winona Hall 



Orthis (Billingsella) pepina Hall 



Bellerophon antiquatus Whitfield .... 



Euomphalus winonensis n.sp 



Helicotoma (?) peccatonica n. sp 



Holopea obesa Whitfield 



Metoptoma barabuensis Whitfield... 



Murchisonia argylensis n. sp 



Murchisonia putilla n. sp 



Ophileta alturensis n. sp 



Pleurotamaria sweeti (Whitfield).... 



Rapliistoma leisomellum n. sp 



Raphistoma lewistonense n. sp 



Raphistoma minnesotense Owen 



Raphistoma oweni n. sp 



Raphistoma ruidum n. sp 



Straparollus intralobatus n. sp 



Subulites exactus n. sp 



Tryblidium (?)repertum n. sp 



Ascoceras gibberosum n. sp 



Cyrtoceras dresbachense n. sp , 



Cyrtoceras winonicum n. sp 



Endoceras consuetum n. sp 



Piloceras corniculum n. sp 



