34 PALEONTOLOGY OF NEW JERSEY. 
There is no Tudicla in the Cretaceous to which it bears any great resem- 
blance. 
Formation and locality: Lower Green Marls, at Crosswicks Creek, 
New Jersey. In the collection at Rutgers College. 
Genus PYROPSIS Conrad. 
Jour, Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 288. 
Mr. Conrad describes this genus as follows: ‘Spire very short, apex not 
papillated; labrum without strize within, thick; columella without a fold;” 
and places it as a subgenus under Tudicla Bolton. Immediately following 
the generic description he describes T. (Pyropsis) perlata, Pl. xvi, Fig. 39, 
which, although not cited as the type, ought naturally, from its position in 
connection with the generic description, to be considered such. This shell 
possesses close affinities with the M uricide, and with the Haustellum group, 
having a long, slender canal and beak, with the inner lip of the aperture 
strongly reflected over the body whorl and columella, leaving an open 
space between itself and the columellar portion of the beak, but not a true 
umbilical cavity. The canal is entirely open, however, and the whorls are 
without varices, although there appears to be a tendency to form spines on 
the periphery. The absence of strize within the aperture and want of ridge 
or tubercle at the base of the posterior angle of the aperture on the inner 
lip separate it fromthe genus Tudicla, with which in nearly all other char- 
acters itagrees. It is somewhat difficult to determine satisfactorily, among 
the casts with which I have to deal, which should be placed under this 
genus and which may belong to Mr. Gabb’s genus Perissolax, as Mr. 
Gabb’s type of this genus, P. trivolva, is so very closely related to this one. 
There appears to be little difference between the two genera if the 
types alone are considered, but a part of those herein referred to Pyropis, 
which would seem to be properly referable to it, depart considerably from 
the type in the greater height of the spire, the rounding of the volutions, 
and probably in the shorter canal, and appear to form a connection between 
this genus and Pyrifusus Conrad. But this latter genus has never been 
properly understood, owing to the improper figuring of the type species, the 
original of which I have examined. (See. description of that genus else- 
where in this volume, p. 48.) 
