MIOCENE MOLLUSCA AND CRUSTACEA. 105 



iieled or grooved. Aperture less than one-third of the entire length, the 

 outer lip thickened and varix-like externally, and somewhat also internally, 

 and marked by several tooth-like lines on the inner side. Inner lip also 

 distinct and somewhat thickened with several tooth-like striiB, the posterior 

 end of the aperture being slightly • channeled and the front strongly so; 

 beak distinctly constricted at its junction with the body whorl. Surface 

 granularly cancellated with nearly direct vertical lines or ridges and raised 

 S2)u-al lines, forming granules or asperities at their intersection, and the 

 last whorl having a single lip-like varix. Spiral lines eight or nine in num- 

 ber on the body whorl, and the vertical lines eighteen or twenty, exclusive 

 of the lip and varix. Volutions above the last not possessing lip-like varices. 

 This species closely resembles Tritia trivittata, Say in its general appear- 

 ance, bnt when examined in detail presents several very important differences 

 which at once separate it from that well-known species of our coast. In 

 the first place, it is universally smaller in size; then the suture is not chan- 

 neled or grooved, or perhaps better expressed by the statement that the 

 upper side of the volutions does not possess the depressed groove of that 

 species; the outer lip of this shell when entire is distinctly thickened, form- 

 ing a round, raised, varix-like thickened rim, with a lip-like varix some- 

 where within the limit of the last whorl on all the larger individuals seen, a 

 feature not possessed by T. friviffafa. The inner surftice of both outer and 

 inner lij) is denticulated more distinctly than is usual with T. trivittata. 

 These points of distinction have decided me in separating it as a distinct 

 species. 



Formation and localities: In the gray marls of the Miocene, at Sliiloh 

 and Jericho, N. J. In the collection of the National Museum. I have not 

 seen the specimens from the well-boring at Atlantic City, N. J., identified 

 by Prof Heilprin as T. (Nassa) trivittata, so can not say if they are the same 

 as the above. 



Tritia trivittatoides, var. elongata, new var. 

 PI, XIX, figs. 4-6. 



A number of specimens of full growth, having many of the features of 

 T. trivittatoides above described, occur in the collection. They vary from 



