Cincinnatian and Lexington Fossils 41 



is the top of a series of iine-grained blue limestones referred to the 

 Wilmore bed. That part of fine-grained limestone section which 

 is above river level has a thickness of 16 feet. It contains Modio- 

 lodon oz'iforniis, Rhynchotrema inequivalve, a variety of Hebertella 

 frank fortcnsis with more numerous radiating plications than in 

 the tvpical form. Liospira vitritvia, Lophospira medialis, and 

 Schizocrania Mosa. This Schizocrania Hlosa is oval in form, nar- 

 rower posteriorly. The length of a well preserved specimen is 16 

 mm., its width is 15 mm., and the convexity of the dorsal valve 

 is about 3 mm. Radiating striae numerous, about 12 in a width 

 of 2 mm. Posterior adductor scars large, similar in form to those 

 represented in figure 26, plate IV G, in the Paleontology of Nezv 

 York, vol. VIII. by Hall and Clarke from the Maysville formation 

 at Cincinnati, Ohio. The anterior edge of the scars extends to 

 6.5 mm. from the beak. The anterior adductors are small, and 

 are 8 mm. from the beak, and 4 mm. from each other. 



Schizocrania Hlosa occurs in the Wilmore bed, and recurs in 

 the Maysville formations, being known from the Fairmount, Belle- 

 vue, and Corryville beds. 



Crania granulosa — cumberlandensis. var. nov. 



iriatc V, fig. S.) 



A mile and a quarter southwest of Cumberland City, Ten- 

 nessee, along the railroad, about half a mile south of the crossing 

 of the Erin pike, a species of Crania occurs associated with Dinor- 

 this deflecta, Orthis tricenaria, Dalmanclla siihaeqnata, Stropho- 

 mena incurvata, Rafinesquina niinncsotcnsis, and other fossils 

 belonging to the Stones River Group. In Kentucky, equivalent 

 strata occur at High Bridge, where a similar assemblage of fossils 

 occurs in the Camp-nelson division of the High-bridge formation. 



The specimens of Crania resemble in outline and size some of 

 the specimens of Crania scabiosa. Some of the specimens attain 

 a length of 10 mm. and a width of 12 mm. The outline, in gen- 

 eral, is rounded, but the anterior margin usually is more or less 

 straightened. The surface of the upper valve is of medium con- 

 vexity, and the apex is rather blunt. Compared with Crania 

 setigera, from about the same horizon in the northern states of the 

 Mississippi valley, the granules are much more numerous. Compar- 

 ed with Crania granulosa, the shell is larger, less orbicular in outline, 



