GASTEROPODA OF THE LOWER GREEN MARLS. 39 



This species is somewhat" obscure in its generic features. Mr. Gabb's 

 figure is somewhat longer than the specimen from which it was made, the 

 spire being rather high and the beak less prolonged. I am not at all sure 

 that it is not properly referrable to the genus Perissolax, but it is, perhaps, as 

 safe to leave it here as to venture another reference without a more positive 

 knowledge of the shell itself, nothing but casts having yet been seen. I 

 have only two casts in hand which I have referred to the species, and they 

 differ considerably from each other in the proportional gibbosity of the 

 body whorl and somewhat in the proportional length of the body of the 

 shell. 



Formation and locality : In the Lower Green Marls at Walnford, New 

 Jersey, at Mr. C Bruere's pits, and the sand under the LoAver Marls at Mr. 

 Backman's pits, near Middletown, New Jersey. Mr. Gabb's specimen came 

 from the same horizon at Mullica Hill, New Jersey. 



Pyropsis Richardsonii ? 

 Plate I, Figs. 14-16. 



? Pyrula Richardsonii, Tuomey: Proc. Acad. Nat. Sci., PMla., 1855, p. 169; Con- 

 rad, Am. Jour. Conch., vol. 4, p. 248. 



Pyropsis Richardsonii (Tuomey) Gabb: Proc. Acad. Nat. Sci., Pbila., 1876, p. 384. 



Perissolax [.^] Richardsonii (Tuomey) Gabb: Gabb, Synopsis, p. 67; Meek, Check 

 List Cret. and Jur. Foss., p. 33. 



The casts which I have considered as most nearly allied to Dr. Tuomey's 

 species, so far as I can judge of its characters from his description, are 

 broadly pyriform and but slightly convex on the top, the inner volutions 

 scarcely rising above the surface of the body whorl, in this feature agree- 

 ing with his statement, "spire depressed, almost flat." The form of the 

 outer volution is depressed convex above, but not flat, the surface slightly 

 sloping in some individuals from the suture to near the point of great- 

 est diameter, and regularly rotmded on the sides and below, but ex- 

 tended into a long, slightly curved beak and wide open canal in front 

 when perfect, which is very rarely the case. Only a single individual has 

 been found preserving this portion of the cast entire among all this group 

 of shells seen from New Jersey. The volutions are abo ut three in num- 



