St. Peter's Sandstone. 



133 



GASTEROPODA. 



Specimens of the genus Murchisonia are referred to by 

 Meek as occurring in Monteau County, Missouri.* Crinoid 

 columns were also found associated. 



Fragments of the internal casts of Straparolius and 

 Chemnitzia were stated by Shumard to be found in the sand- 

 stone in Ozark County, Missouri."*" They were too imperfect 

 for accurate determination. 



Maclurea (?). This is recorded by F. W. SardesonJ as 

 occurring in the St. Peter's formation, near St. Paul, Minne- 

 sota, together with the species mentioned below. From the 

 uncertainty felt in the identifications, it seems evident that 

 the fossils are not in a very good state of preservation. Mr. 

 Sardeson states that they occur about fifty feet below the top 

 of the formation, and that " they are remarkably like species 

 found in the lower part of the Trenton shales and in the 

 Trenton limestone, which here rests conformably on the St. 

 Peter sandstone." 



Murchisonia gracilis Hall. Murchisonia (?) tricarinata (?) 

 Hall. 



LAMELLIBRAXCHIATA. 



Cypricardites rectirosiris Hall. Cvpricardites, 2 sp. undeter. 

 Modiolopsis ? (Mentioned by Sardeson.) 



ANNELIDA. 



Arenicolitcs ; Scolithus sp. A species of Arenicolitcs is 

 referred to by Winchell|| as occurring in the sandstone at 

 Faribault, in Rice County, Minnesota. He says: "The 

 sandstone here is pitted with circular holes, such as have 



"First and Second Annual Reports of Geological Survey of Missouri, Part II, 

 1S55, p. 106. There is considerable doubt in regard to the exact position of all the 

 fossils here recorded from Missouri. As already noted the Saccharoidal sandstone 

 in which they are stated to occur, is referred by Xason to the Cambrian. 

 fReports of the Geological Survey of Missouri, 1^55-1871. 1873, p. 192. 

 JFossils in the St. Peter Sandstone. Bull. Minn. Acad. Nat. Sci., Vol. Ill, p. 318. 

 Geological Survey of Minnesota. Volume I of the final report. 1SS4. pp. 656-657- 



