LOWER CARBONIFEROUS FOSSILS. 541 



This same shell is found in the Chouteau limestone of Cooper County, 

 Missouri, and at the base of the Lower Carboniferous at Providence Land- 

 ing, Missouri, and at Blackwater Bridge, Saline County, Missouri. 



Formation and locality : Madison limestone, Hunter Peak, Absaroka 

 Range ; Arnold Hague. Limestone bluff north of Little Sunlight Creek, 

 Absaroka Range; Arnold Hague. East side of Gallatin River, west of 

 Electric Peak; divide between Gallatin River and Panther Creek, Gallatin 

 Range; amphitheatre east of Bannock Peak, Gallatin Range, bed 28; 

 W". H. Weed. Crowfoot Ridge, Gallatin Range, top of bed 25 ; J. P. Iddings 

 and G. M. Wright. Same, bed 26; J. P. Iddings and W. H. Weed. South 

 of Forellen Peak, Teton Range ; S. L. Penfield. Northwest slope of same ; 

 S. L. Penfield. South slope of Quadrant Mountain, Gallatin Range; north 

 of Bighorn Pass, Gallatin Range; Crowfoot Ridge, Gallatin Range, bed 

 24; A. C. Gill. Same, top of bed 24; J. P. Iddings. Head of Conant Creek, 

 Teton Range; W. H. Weed. North of Owl Creek, northeast slope of Teton 

 Range; W. H. Weed. Upper Carboniferous, Lincoln County, Nevada. 

 Waverly age, Wasatch Range, Utah. Chouteau limestone, Cooper 

 County, Missouri ; Providence Landing, Missouri ; Blackwater Bridge, 

 Saline County, Missouri. 



Camarotozchia sappho Hall (?). 



Bhynchonella sappho Hall, 1860: Thirteenth Rept. New York State Cab. Nat. Hist., 



p. 87. Herrick, 1888: Bull. Deuison University, Vol. Ill, p. 40, PI. V, fig. 1; 



PI. VII, fig. 25. Herrick, 1895: Geol. Ohio, Vol. VII, PI. XXI, fig. 1. 

 Rhynchonella (Stenoeesma), sappho Hall 1867: Pal. New York, Vol. IV., p. 310, PI. 



LIV, figs. 33-13. 

 Camarotcechia sappho Hall and Clarke, 1893: Pal. New York, Vol. VIII, Pt. II, p. 192. 



PI. LVII, figs. 10-11. 



The specimen which represents this type is larger than any in the 

 collection referred to the genus Camarotoechia. When j)erfect it must have 

 measured 16 mm. in length by 21.5 mm. in width. It is a rather flat, 

 explanate shell, resembling in this respect C. herrickana rather than the 

 other forms represented in the Yellowstone National Park. The lateral 

 slopes are nearly straight or slightly concave, and extend about half the 

 entire length of the shell, where they are met by the deeply bowed anterior 

 margin. The fold is not high, but can be traced to the rostral region. It 

 is traversed by six small, rounded plications, and about seven others are to 



