GASTEROPODA OJ? THE LOWER GREEN MARLS. 55 



rather more than one-half the length of the entire shell, exclusive of the 

 short beak; aperture oblique, angularly ovate; columella slender as shown 

 by the cavity left by the removal of the substance of the shell; volutions 

 marked by strong, oblique, vertical folds, which are distinct on the periph- 

 eral angle, but do not extend much above or below, on the cast; strong 

 spiral lines on some of the casts, eight to ten of which are seen on the ex- 

 posed portion of the upper volutions, the number marking the basal por- 

 tion of the body volution not being determinable. 



This species, although small, is distinguished from the associated 

 species, and also from any of those from the western Cretaceous, by its pro- 

 portionally more elevated spire and exsert volutions. It diifers somewhat 

 from most species of the genus in the proportions of the spire as compared 

 with the length below the angle of the body whorl, being much longer 

 above than below the point of greatest diameter. In this respect, as well 

 as in its general size and appearance, it very closely resembles Turris 

 (Surculaf) contortus M. & H., as figured,^ but is distinguished from that 

 form by having the upper surface of the volutions distinctly convex instead 

 of concave, while such slight indications of the transverse strise as are seen 

 on some of the casts show that no slit or sinus of the lip existed, thus 

 removing it definitely from that group of shells. 



Formation and localities : In the Lower Grreen Marls at Crosswicks, and 

 from the Brown Marls of the same formation near Burlington, in the collec- 

 tion Acad. Nat. Sci., Phila., and from sand under the Lower Marls at Mr. 

 Backman's pits at Middletown, New Jersey. In the collections at Rutgers 

 College. 



Pykifusxjs mbeki, n. sp. 



Plate IV, Figs. 6, 7. 



Shell moderately large for the genus, having a diameter of nearly 1^ 

 inches of the body whorl; subequally biconical in general outline; spire 

 elevated, having an apical angle, as seen in the cast, of somewhat less than 

 60°, with the spire slightly longer than the shell below, as viewed from 

 the back of the last volution; volutions probably about four in number 



'U. S. Geol, Surv. Terr., vol. 9, Invert. Pal., PI. xxxi, Fig. 7. 



