2 2 Bulletin 5 393 



44 Say on Shells, &c. 



of the opposite valve, slightly more depressed ; two or three 

 more conspicuous incremental lines are continued so as to 

 cross the projecting face of the siphunculated hinge margin, 

 which is but slightly prominent. 



Cabinet of the Acad. Nat. Sciences. 



This handsome vSpecies was found in the New-Jerse}^ Al- 

 luvium by Mr. S. Wetherill of Burlington. The folds are 

 somewhat similar to those of Plicatula plicata. It resem- 

 bles the T. crumena of Sowerby, in the form of its folds, and 

 in their extending to the beak, but the middle of the front 

 is very slightly elevated, with but two folds, instead of three 

 as in the crumena, the sides also have two or more folds, in- 

 stead of four or more, and the beak is not very prominent. 



Belemnites. 



These are often found in the New- Jersey Alluvium, 

 sometimes entirely changed into chrystalized blue iron earth, 

 {Hydrate of iron, of Judge Cooper.) 



Ammonite. 



A species of this genus was found in the abovementioned 

 locality by Mr. Wetherill. It approaches nearest to A. ele- 

 gants of Sowerby, but I have not seen a specimen sufficiently 

 entire to determine its species with exactness. 



De7italium. 



A species has been found in New- Jersey, near Mulliger 

 hill, by Mr. A. Jessup, which seems to approach nearest to 

 D. sulcatus, but as it has only about sixteen equal costse it is 

 more than probably a new .species. 



Ttirritella. 



A species of this genus was found by the same gentleman 

 with the preceding, in plenty. It approaches very closely 

 to the T. conoidea of Sowerby and is most probablj^ the same 

 species. 



I have seen several redintrigrate fossils from the New- 

 Jersey Alluvium, amongst 'which I may mention a Cucullaea, 



[A. J. S., 1st Ser., Vol. II.] 



