290 SYSTEilATIC PaLEOXTOLOGY ^IlDDLE DEVONIAN' 



gradually expanding to the body-whorl ■which is somewhat abruptly 

 ventricose, flattened or a little concave for a short distance below the 

 suture, and the space limited on the exterior side by a carina, which is 

 the first of a series, marking the periphery of the volution. Surface 

 marked by extremely fine lamellose lines of growth, which are directed 

 backwards from the suture without bending or curvature in passing the 

 carinations; the volutions, except the narrow concave space above, are 

 marked by strong revolving elevated carinate lines, of which there are 

 from fourteen to eighteen on the body- whorl; these carinae are usually 

 simple and subequal, more or less distinctly defined, and sometimes alter- 

 nately stronger and more subdued, or with two finer ones between the 

 stronger; on each of the upper volutions there are three, four or five of 

 these carinae preserved, and they are distinctly crenulated by the passage 

 of the concentric striae, which are som.etimes also bent forward on ap- 

 proaching the first carination." Hall, 1879. 



One specimen from the West Virginia side of the Potomac Eiver four 

 miles below Cumberland shows very distinctly four whorls which are sim- 

 ilar in form to those of this species. The surface markings, however, 

 are imperfectly preserved; but on the upper half of the body-whorl are 

 more or less clearly shown portions of seven revolving carinate lines. 

 Similar carinate lines are very poorly shown on the lower half of this 

 whorl, while the fine lines of growth are scarcely shown at all. 



Length, 26 mm.; width, 22 mm. 



Occurrence. — Romxey Formation, Hamilton' Member. East side 

 Warrior Mt. east of Rush; on Hancock-Harrisonville Eoad about 2 miles 

 north of Hancock; AV. Va. side Potomac Eiver 4 miles south of Cumber- 

 land. 



Collection. — Mar}-land Geological Survey. 



Cyclonema liratum var. grabaui n. var. 



Plate XXXVI, Figs. S, 9 



Description. — Volutions four, subangrdai', sloping gradually from the 

 suture to the first carinate ridge, of which two are visible on the upper 



