GASTEROPODA OP THE LOWElt GKEEN MARLS. 145 



TUREITELLA HaRDIMANENSIS. 



Turritdla Hardemanensis Gabb : Jour. Acad. Nat. Sci., Phila., vol. 4, 3d ser., p. 

 393, PI. Lxviii, Fig. 15 ; Synopsis, p. 90; Meek, Check List Cret. and Jur. 

 Foss., p. 18; Geol. N. J., Newark, 1868, p. 739. 



Mr. Meek cites this as a New Jersey species in his list as above quoted, 

 and in the Smithsonian check list gives only New Jersey as its habitat. 

 Mr. Grabb states, under his original description, that he has seen a "very 

 young" specimen of it in the cabinet of Mr. Lea, obtained from the Rip- 

 ley group, in New Jersey. This I presume means either Crosswicks, or 

 more probably Haddonfield, New Jersey, as Mr. Lea had specimens from 

 this latter place. I have not seen the specimen in question, and as it is 

 said to have been a very young specimen, fear there may have been some 

 mistake in the identification; especially as the species, so far as known 

 from the type, is a small one anyway. Young Turritellas are not the 

 most reliable material for specific determiiiations, although it is possible 

 that in this case it may have been correct. The beds at Haddonfield 

 are at the very lowest horizon yet yielding undoubted Cretaceous fossils 

 in New Jersey, and have litKological features remarkably similar to those 

 of the Ripley group of the more southern States, so there is a double 

 chance of error in this case. 



TURRITELLA LiPPINCOTTI, n. Sp. 



Plate xviii. Figs. 33, 34.. 



Shell of medium size, rather rapidly tapering, the apical angle being 

 about 20° or less. Volutions flattened on the surface in the direction of 

 the spire, with scarcely perceptible suture lines where the shell is pre- 

 served, and only very moderate ones in the cast ; their form in a section 

 being trapezoidal, the upper and lower outer angles being rather sharply 

 angular, even in an internal cast; basal face scarcely convex; volutions 

 numerous, a fragment measuring not quite 2 inches in length, with a 

 diameter at the lower end of five-eighths of an inch, retaining seven, with 

 space at the upper portion for about five more. Surface of the shell 

 marked, in the only specimen which preserves it, by fine rounded spiral, 

 thread-like lines over the entire surface. 



The species resembles, in its general contour, T. vertebroides Morton, 

 but tapers somewhat more rapidly. It differs from that one," and all the 



MON, XVIII 10 



