G14 Systematic Paleontology — Upper Devoxiax 



features seem to jiersist and to exclude danger of confounding the species 

 with its many associates in the Naples fauna of both ]\[arvland and Xew 

 York. 



Buchiola retrostriala is not known to occur in American strata older 

 than the Portage or Xaples fauna. The genus does indeed occur in the 

 shales of the Marcellus and Hamilton stages in Xew York and has been 

 reported as Glytocardia spcciosa, hut these shells are altogether distinct 

 from B. retrostriala. 



In jSTew York the species occurs first in the Styliola limestone (Gen- 

 esee stage), M'hich eml)Gdies the iuitial appearance of the Xaples fauna 

 and is extremely abundant throughout the manifestations of this fauna 

 in the Naples (Portage) beds of region between the Cayuga Lake and 

 Genesee valleys in the Naples subprovince. In the more eastward exten- 

 sion of Portage rocks it is only occasionally seen where accompanying a 

 tongue of Naples sediment penetrating into the central province, and in 

 the westerly counties having outcrops of Portage rocks, Erie and Chau- 

 tauqua (Chautauqua subprovince), it is quite rare. 



In the broad and older use of the term the shell is very widely dis- 

 tributed on the horizon of the lowest upper Devonian in Britain, Ger- 

 many, France, Belgium, Eussia and Siberia, but in its more restricted 

 application some of these records must be regarded as subject to modifica- 

 tion. Yet, notwithstanding this consideration, it is the most generally 

 diffused representative of the genus. In Westphalia and in the Hartz it 

 occurs in both lower and upper stages of the upper Devonian. 



Length 8 mm.; height 6 mm. 



Occurrence. — Jennings Formation, Genesee Member. About 100 

 feet above junction of Flintstone and Town creeks; Gilpintown ; Cumber- 

 land, Williams Road and McKay's Hill, southeast of city; Barrclville 

 Eoad one-half mile west of Corriganville ; National Eoad just west of 

 Wolfe Mill ; five and one-half miles southwest of Burlington, West Vir- 

 ginia, on the Eomney Eoad. Woodmont Member, Naples Fauna, 

 Gilpintown east of bridge over Town Creek. 



