748 CRETACEOUS PALEONTOLOGY. 



all those rotund examples of Pyropsis 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 of the strongly canaliculate suture. 

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

 themselves 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 from 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. 



Formation ' and locality. Marshalltown clay-marl, near 

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

 Middletown (ii3 2 ), near Crawfords Corner (i26 7 ), near Holm- 

 del (i28 5 , 127), Mullica Hill (i6g 2 ) ; Tinton beds, Beers Hill 

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



Geographic distribution. New Jersey, Alabama, Mississippi, 



Pyropsis ? obesa Whitfleld. 

 Plate LXXXVIIL, Figs. 5-6- 



1892. Pyropsis ? obessa Wttitl, Pal. N. J., vol. 2 (Monog. IL 

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



Description. "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.) 



