Maryland Geological Survey 673 



This species appi'oaclies C. liamUionicc of the Hamilton of New York 

 in form and size, but diifers in having more numerous and closer carinae 

 and in the absence of the conspicuous broad concave band on upper 

 part of the volution which is present in that species, as well as in its 

 more conspicuous transverse striae. It differs fi'om C. crenuUstriata in 

 its larger apical angle, smaller size, closer revolving carinse, and more 

 rounded volutions. At times it is difficult to separate imperfectly pre- 

 served specimens of this species from Pleiirotomaria (Gyroma) capillaria 

 especially when the peripheral band of the latter is not preserved. The 

 transverse striae of the latter species, however, are much stronger and are 

 distinctly visible in the interspaces between the revolving strisB. This is 

 the most common species of Cy clone mina in the Jennings and is very 

 abundant in the Parkhead fauna. 



Occurrence. — Jennings Formation, Chemung Member. Two miles 

 north of mouth of Town Creek, 1949 ; Town Creek, 2228 ; 2 miles west of 

 Pawpaw, 2124. Parkhead Member. Eocky Eun, Williams Eoad, on 

 Polish Mountain, 1660 abundant; National Eoad, on Polish Mountain, 

 1625; 2 miles north of mouth of Town Creek, 1723; Town Creek, 1863 

 common ; 2 miles west of Pawpaw, 1493 ?, Little Orleans ; Fifteenmile 

 Creek, 1 mile above Little Orleans, 1713, 1746, 1773; 21/2 miles above 

 mouth of Sideling Hill Creek abundant; Berkeley Springs, West Vir- 

 ginia, 1544 to 1566. 



Collection. — Maryland Geological Survey. 



Genus TURBO Klein 



Turbo coronola n. sp. 



Plate LXVIII, Figs. 11, 12 



Description. — Shell of commanding proportions, low spiral, broad body 

 whorl, oblique enrollment. Early whorls depressed with subconvex sur- 

 faces and clearly impressed suture. On the latter part of the second 

 whorl the surface shows irregular oblique swellings on the upper one- 

 third and these disarrange and disorder to some degree the otherwise 

 regularly concentric growth lines. The body whorl loses the regularity 

 of its convexity, becomes protuberant above and bears a series of very 

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