748 CRETACEOUS PALEONTOLOGY. 



all those rotund examples O'f Pfrapsis which occur in the Nave- 

 sink marl, the species being distinguished from- the associated P. 

 septemlirata by their less abrupt contraction below to the anterior 

 canal, and by the absence o>f the strongly canaliculate suture. 

 These casts of P. trochifornds, however, vary somewhat among 

 thems-elves in the rapidity of their contraction below, in the 

 amount of elevation of the spire, and in the strength of the impres- 

 sions of the revolving costse upon the internal casts, but a com- 

 parison of many individuals from New Jersey and fro^m southern 

 localities has led to the conclusion that they cannot be specifically 

 divided, at least not in the condition of internal casts, the condi- 

 tion in which they almost invariably occur. 



Pofmation and locality. — Marshalltown clay-marl, near 

 Swedesboro (177); Navesink marl, Atlantic Highlands (108), 

 Middletown (113^), near Crawfords Corner (126'^), near Holm- 

 del (I28^ 127), Mullica Hill (169^); Tinton beds, Beers Hill 

 cut, south of Keyport (129^), Tinton Falls (no). 



Geographic distribution).— New Jersey, Alabama, Mississippi. 



Pyropsis 7 obesa Whitfield. 



Plate LXXXVIII., Figs. 5-6. 



1892. Pyropsis f obessa Whitf., Pal. N. J., vol. 2 (Monog. U. 

 S. G. S., vol. 18), p. 40, pi. 3, figs. 12-13. 



Dgscription. — "Shell of moderate size, very ventricose, with 

 very round, full, short volutions, and short obtuse spire, the body 

 volution being produced below to form a short beak of almost 

 insignificant proportions, as shown by the cast; apical angle 

 about 80 degrees; volutions about three in number, very short 

 and compact; smooth on the surface, except on the last one, 

 where spiral lines are shown to have existed on the shell and 

 tO' have left their imprint; only about five or six of these trace- 

 able, and those on the lower side; aperture moderately large, 

 obliquely ovate, rounded above and pointed below; columella 

 rather strong, somewhat flexuose, judging from the axial cavity 

 left in the cast, and apparently marked by a single, rather promi- 

 nent oblique ridge in its lower part." (Whitfield.) 



