40 Aug. F. Foerste 



Schizocrania rudis, Hall. 



(Plate III, figs. 22 A, B.) 



The type of Schizocrania rudis was found in the Saltillo lime- 

 stone at Clifton, Tennessee. Its length was a little over 8 mm., 

 and its width was about 13 mm. Judging from the illustration 

 accompanying the original description, the specimen was imperfect 

 posteriorly, and was flattened out laterally. The radiating striae 

 are described as sharp, and flexuose. 



In a second specimen, found by the writer at the same locality, 

 the posterior outline on one side of the beak is wdl preserved, and 

 is shown not to be concave, but rounded as in oval forms of 

 Schizocrania Hlosa, and the beak is considerably more prominent 

 than in that species. The length of the specimen is 11 mm., the 

 width is 10 mm., and the number of radiating striations varies 

 from 6 to 8 in a width of 2 mm. The striae are not flexuose except 

 where affected by the distortion of the specimen, due to crushing. 

 The fuller, more prominent beak, and the more conspicuous and 

 more distant radiating striae will serve to distinguish this species 

 from Schizocrania Hlosa. 



Schizocrania schncherti, Hall and Clarke, from strata beneath 

 the Fulton horizon at Covington, Kentucky, may prove to be much 

 more closely related to Schizocrania rudis than suspected at the 

 time when the posterior margin of the shell was believed to be 

 concave on each side of the beak. According to E. O. Ulrich. this 

 lower horizon at Cincinnati contains a fauna including elements 

 closely similar to that of the Hermitage in Tennessee, to which 

 the Saltillo limestone appears to be equivalent. 



Schizocrania filosa, Hall. 



Schizocrania hlosa was described from the Trenton, at Mid- 

 dleville, New York, and the figures accompanying the original 

 description are circular in outline. A specimen from the Trenton 

 at Trenton Falls, New York, is figured by Hall and Clarke as oval 

 in form. 



On the south side of the Kentucky river, in Madison county, 

 opposite Ford, the top of the Paris division of the Lexington lime- 

 stone is 35 feet above the level of the railroad. Sixty feet below 

 the level of the railroad, or 95 feet below the top of the Paris bed, 



