GASTEROPODA OP 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 



Beds at Mullica Hill, New Jersey. In the collection Am. Mus. Nat. Hist., 



New York city. 



Pyropsis trochiformis (?) 



Plate I, Figs. 4-7. 



Pyrula trochiformis Tuomey: Proc. Acad. Nat. Set., Phila., 1856, 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. 385. 



Shell pyriform, with a nearly fiat 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 cast, 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. Bichardsonii of the same author; but the revolving 

 ridges are more distinctly 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. Sci., Phila., 

 where I find them under the name Pyropsis trochiformis, in 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 lieds. 



