356 SYSTEMATIC PALEONTOLOGY 



The general aspect of this trilobite is not unlike certain European 

 species of Acidaspis. This species can be recognized easily from its free 

 cheeks, but more of the trilobite is necessary before its affinities can be 

 definitely determined. 



The specific name is in honor of Dr. E. 0. TJlrich in appreciation of 

 his work on the faunas and stratigraphy of the Appalachian Valley. 



Occurrence. FREDERICK LIMESTONE. Frederick, Maryland. 



Collections. Maryland Geological Survey, U. S. National Museum. 



Order PROPARIA 



Family CALYJWENIDAE 



Genus CALYMENE Brongniart 



CALYMENE GEANULOSA (Foerste) 



Plate LVI, Figs. 1, 2 



Calymene callicephala granulosa Foerste, 1909, Bull. Sci. Lab. Denison 

 Univ., vol. xiv, p. 294. 



Description. This species is one of several that have usually been 

 identified as Calymene callicepliala, but the latter name has been dropped 

 on account of uncertainty as to the species represented. The Eden form 

 of Calymene differs conspicuously from other Cincinnatian species of the 

 genus in the presence of numerous granules upon the carapace. Other 

 differences, such as smaller size and a less strongly elevated anterior border 

 of the cephalon, may be noted, but the granulose surface is the best marked 

 feature. 



Occurrence. MARTINSBURG SHALE (Eden division). Jordans Knob, 

 one and one-half miles northeast of Fort Loudon, Pennsylvania ; Cowans 

 Gap, five miles northeast of McConnellsburg ; and Tuscarora Mountain, 

 two and one-half miles southeast of McConnellsburg, Pennsylvania; 

 Eickard Mountain, Washington County, Maryland. Eden shale at Cin- 

 cinnati, Ohio. 



Collections. Maryland Geological Survey, U. S. National Museum. 



