692 Systematic Paleontology — Upper Devonian 



Description. — Simple straight cones, with normally transverse septa; 

 well characterized by its finely cross-lined surface, these lines being 

 incised in such manner as to leave the adjoining surfaces with an im- 

 bricating aspect. The shells are readily recognized and the authors have 

 little hesitancy in referring thereto some fragments showing this peculiar 

 ornament. 



Length of fragment 42 mm. ; diameter at narrow end 13 mm., at 

 wider end 16 mm. Depth of chambers 1^-2 mm. 



Occurrence. — Jennings Formation, Genesee Member. Parker farm 

 near Burlington, West Virginia. Woodmont Member, Naples Fauna. 

 Polish Mountain section, exposure east of Town Creek. 



Collection. — Maryland Geological Survey. 



Order AMMONOIDEA 



Suborder MICROCAMPYLl 



Family BACTRITIDAE 



Genus BACTRITES Sandberger 



Bactrites acicdlus (Hall) 

 Plate LXXI, Fig. 11 



Orthoceras aciculum Hall, 1843, Geol. of N. Y., Rept. 4th Dist, p. 243, fig. 4. 

 Coleolus aciculum Hall, 1879, Paleontology of New York, vol. v, pt. ii, p. 187, 



pi. xxxiia, figs. 11-15. 

 Bactrites aciculum Clarke, 1898, 16th Rept. N. Y. State Geol., p. 128, pi. ix, 



figs. 17-22. 



Description. — ^These shells occur in the New York Genesee and Naples 

 beds mostly in flattened condition and it was on such specimens that the 

 species was originally founded. Specimens in the same condition of pres- 

 ervation, smooth, flattened, awl-shaped bodies, showing little structure 

 and no evidences of transverse septa occur in the corresponding beds of 

 Maryland and are referred to the above species. Such examples represent 

 only young shells or the apical portion of the full-grown individuals 

 which probably attained a length with regularly expanding shell of 3 or 

 4 inches. 



These bodies have been found at various localities. 



