GASTEROPODA OF THE EOCENE MARLS. 211 



form of species referred by Tryon to the section Amoria Grray, typified by 

 V. undulata Lamarck; or by Paetel in his catalogue, to Scaphella Swain., but 

 there appears to be so much confusion about the sections of Valuta among 

 authors that it is unsafe to refer a species to any one of the subdivisions. 

 The present species would undoubtedly afford ample grounds for a distinct 

 division under the hands of many, but I prefer not to divide where there 

 has been so much already done, unless on the most pronounced features. 



Formation and locality : In the upper layers of the Upper Green Marls 

 at Shark River, New Jersey. Collection of the Am. Mus. Nat. Hist. 



VoLUTA (Scaphella) Newcombiana. 



Plate XXXII, Figs. 1-3. 



Valuta Newcombiana Whitf . , Am. Jour. Conch. , vol. 1, p. 263, PL xxvii, Fig. 12. 



Shell of medium size, elongate-elliptical in general outline, longer below 

 than above the point of greatest diameter, but somewhat variable in pro- 

 portions in different individuals. " Spire elevated, the apical angle varying 

 from 45° to 60° in different individuals, partly owing, probably, to the 

 degree of distortion by compression of the casts. Volutions five or six, the 

 apex not preserved in any of the specimens present. Volutions gently con- 

 vex, the body whorl often decidedly angular at the shoulder, gently convex 

 over the principal part and again more rapidly constricted at about the 

 lower third. Aperture large, mo re than half the length of the entire shell. 

 Columella strong, marked by four strong oblique plications or folds in the 

 lower part. Surface of the shell marked only by irregular concentric lines 

 parallel to the margin of the aperture. 



The shell is known from New Jersey only in the conditions of internal 

 casts, and these more .or less distorted by compression, so that the characters 

 are more obscurely shown than on the examples from Alabama, where the 

 shells are beautifully preserved. These casts vary greatly in the height of 

 the spire and in the angularity of the body volution, those having higher 

 spires always bein g less angular than the short spired specimens. It is pos- 

 sible there may be two distinct species among the casts which I have 

 referred to this one, but as most of these variations are observable in the 

 Alabama examples, I have preferred to class them as one for the present. 



