'32 



Ciuciiuiati Society of Natural History. 



FOSSILS. 



The organic remains found in the St. Peter's are but few. 

 The following list is believed to include all that have been 

 noticed as occurring. 



BRACHIOPODA. 



Lingulepis morsensis Winchell. Prof. N. H. Winchell, in 

 1876, described this species as follows: "Shell conical or 

 elongate-conical, with anterior angles rounded ; depressed ; 

 the apical angle not seen perfect ; the front margin gently 

 convex; sides nearly straight, but converging at an angle of 

 about 26 degrees ; greatest width is near the front, and at a 

 distance from the anterior margin of one third the greatest 

 width. The surface is smooth and shining, marked with 

 very fine concentric striae, visible especially in the anterior 

 portion, and with more distant, dim undulations of growth. 

 Entire length of the larger specimen seen about .85 inch; 

 width, .52 inch; length of the smaller, .78 inch; width, .45 

 inch. Color of the shell light brown, with spots of brown. 

 The smaller specimen has flattened, or slightly concave 

 margins, for nearly two-thirds the length from the apex. The 

 species in general contour resembles Lingulepis briseis, of 

 Billings (Palaeozoic Fossils, Vol. I, p. 48), but differs from it 

 in not having its sides parallel."* 



This species is found at Fountain, Minnesota, in a sandy 

 shale, in transition beds between the Trenton and the typical 

 St. Peter's, and it is really questionable if it belong to the 

 latter period. It has, however, been placed there by Winchell, 

 and is therefore inserted here. 



Orthis sp. cf. testudinaria Dalman. x\ species of Orthis 

 resembling in size and marking O. testudinaria, occurs in the 

 sandstone and shale beds at Fountain, Minnesota, in associa- 

 tion w T ith Lingulepis morsensis. A similar form is found in 

 the Trenton, which overlies the St. Peter's at Ripon, Wis- 

 consin. 



-Fourth Annual Report of the Geological and Natural History Survey of 

 Minnesota for 1875. 1876, p. 41. 



