YASTEROPODA OF THE LOWER GREEN MARLS. 41 
true relations, but unfortunately such material has not been considered of 
value by collectors and does not often appear to exist in a condition to be 
preserved. 
Formation and locality: In the ferruginous layers of the Lower Marl 
3eds at Mullica Hill, New Jersey. In the collection Am. Mus. Nat. Hist., 
New York city. 
PYROPSIS TROCHIFORMIS (?) 
Plate 1, Figs. 4-7. 
Pyrula trochiformis Tuomey: Proc. Acad. Nat. Sci., Phila., 1855, p. 169. 
Tudicla trochiformis (Tuomey) Gabb: Gabb, Synopsis, p. 85; Meek, Check List 
Cret. and Jur. Foss., p. 22. 
? Pyropsis trochiformis (Tuomey) Gabb: Proc. Acad. Nat. Sci., 1876, p. 285. 
Shell pyriform, with a nearly flat spire; volutions three or four, very 
rapidly increasing in size, ventricose and subangular above, but rapidly 
contracted below and forming a short anterior canal; aperture semilunate, 
subangular above and contracted below ; surface covered by very strong 
spiral lines, which leave their imprint on the east, those on the body of the 
shell strong and coarse, but those below gradually becoming more slender 
toward the base, of which the larger volution probably had twelve or 
fourteen. 
This shell, as shown by the internal casts, if properly identified, is 
very closely allied to P. Richardsonii of the same author; but the revolving 
ridges are more distinetly marked and the form of the volution is shorter, 
and more rapidly contracted below, making the beak more marked and dis- 
tinct from the body of the volution than in that one. 
Formation and locality: The examples which I have referred to Dr. 
Tuomey’s species are from the collections of the Acad. Nat. Sei., Phila., 
where I find them under the name Pyropsis trochiformis, 11 Mr. Gabb’s 
handwriting, I judge. There are several fragments of large casts, but 
only two small ones, which I have considered in the description. The 
locality on the label is marked “Cret., N. J.,” only, like so very many of 
the specimens from this State, but one of these specimens is evidently 
from Mullica Hill; the other I can not refer to any definite locality. The 
lot is credited to Col. Bryan, but I think they are from several localities, 
and probably all from the Lower Marl Beds. 
