Maryland Geological Survey 473 



? Rostellarla spirata Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 23. 

 Anchura pennata Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 

 p. 711, pi. lxxxi, figs. 10-17 (t ex pane). 



Description. — " Shell elevated, with about six convex volutions, and 

 with obscure, oblique, longitudinal costse or undulations ; body whorl ven- 

 tricose ; labrum expanded, sinuous."- — Morton, 1834. 



Type Locality. — Prairie Bluff, Alabama. 



" Shell elongate, spire elevated and consisting of from six to seven volu- 

 tions, which are only moderately convex between the suture lines, the 

 latter being well marked but not deep; apical angle not more than 30°, 

 but often less; last volution proportionally large and with a somewhat 

 extended rostral beak, slender and straight; lip broadly expanded and 

 extended in a narrow border along the side of the beak to a point opposite 

 the base or swell of the volution, where it rapidly widens out into the broad 

 wing-like lip, which reaches somewhat over the next volution above but 

 apparently not forming a posterior canal. The outer posterior angle of 

 the expanded portion is prolonged into a narrow, recurved falciform 

 process of greater or less extent ; volutions marked by oblique longitudinal 

 folds, which extend from suture to suture on all the upper volutions, but 

 become obsolete just above the middle on the body portion of the last one, 

 and are entirely obsolete on the back of the expanded lip. On the upper 

 volutions the folds are closely arranged, but on the lower they are more 

 distant and more strongly marked, while on the body part of the last one 

 they are quite strong and almost node-like, even on many of the internal 

 casts."— Whitfield, 1892. 



Anchura pennata (Morton) is another specific name which, given 

 originally to a poorly preserved and wretchedly figured cast, now covers 

 a curious assemblage of casts and shells. Whitfield figured under the 

 name of pennata two shells with the wing characters more or less perfectly 

 preserved. He also established three apparently closely related species 

 on inside casts, all of which are included by Weller under the name 

 pennata. It seems hardly probable that the two shells which Whitfield 

 figured are specifically identical. Figure 6 indicates a shell with more 

 straight-sided whorls, more numerous, approximately sixteen, less oblique, 



