NAPLES FAUNA IN WESTERN NEW YORK, PART 2 303 



number, its very narrow sulci and fine concentric lines, which together per- 

 mit of its comparison with Beushausen's portraiture of Buch. prumien- 

 sis. In itself the shell is distinguished readily from its associates and it 

 seems to approximate most nearly in its specific traits to B. retro- 

 striata, with which it is not, to our knowledge, associated in the western 

 region. From that species it may be distinguished by its less transversely 

 oval form, more numerous plications, and narrower furrows. The retral 

 lines on the ribs are low and perhaps not so numerous as in B. prumien- 

 s i s ; on the anterior slope of the shell these concentric lines are clearly 

 visible on the furrows. 



Over the body of the shell the ribs are depressed convex and become 

 slightly concave about the periphery, the edges showing a decided tend- 

 ency to elevation. Our specimens consist of internal and external casts of 

 the same shells, which show very little difference in the exactness of the 

 ornamental detail. 



Habitat. Genesee province ; Chautauqua subprovince. All specimens 



observed are from the Big Sister and Farnham creeks in the vicinity of 



Angola, Erie co. and the ravine at Java Village, Wyoming co. B u c h i o 1 a 



prumiensis is from the lower Upper Devonic at Oberscheld, Budes- 



heim, and elsewhere. 



paracardium Barrande. 1881 



This name has been employed only for Siluric shells (Etage E of 

 Bohemia) except by Professor Hall, who referred to the genus the Devonic 

 species here mentioned, P. d o r i s of the Genesee stage (Styliola lime- 

 stone). Little has been made of the genus because of its close similarity to 

 the genera Paracardium and Buchiola, into which in external characters it 

 seems gradually to pass. Yet the general expression of the Devonic shells 

 here embraced under this name is distinctive, and, so- far as external evidence 

 goes, they may with safety be referred to Paracardium. They are shells of 

 circular marginal outline, high and slightly projecting beaks and fine simple 

 radial ribs without other ornament. With regard to hinge structure Com 

 rath 1 has indicated that the hinge line bears denticulations which have no 

 1 Sitzb. der kais. Akad. der Wissensch. 1 Abth. 1887; p. 9. 



