250 PALEONTOLOGY OP NEW JERSEY. 



somewhat smaller than the first, but its divisions and branches are not trace- 

 able on the specimen. The first sinus is about equal in size to the first 

 lateral lobe, and is divided at the summit into three double divisions by 

 three minor lobes, each of which has several points along the sides and on 

 the extremity. 



The specimen difi"ers somewhat in details of the septa from the Upper 

 Missouri River specimen originally described by Hall and Meek, as well as 

 in having a greater circle of curvature along the circumference of the volu- 

 tion, and the volution has also been relatively narrower from side to side. 

 These differences, as well as the sharply pointed form of the divisions of 

 the lobes of the septa, lead one to suspect that were the specimen more 

 perfect a very differently shaped species would be the result. Still, from 

 the very imperfect and unsatisfactory material, it would hardly be safe to 

 designate it as a distmct species. 



Formation and locality: The fragment is from a whitish clay marl 

 with ferruginous markings, but is without locality. It has the lithological 

 characteristics of the white limestone clay at Holmdel, New Jersey, and is 

 most probably from the Lower Marl Beds at that place. The specimen is 

 from the cabinet at Rutgers College, and ■ is that upon which Mr. W. M. 

 Gabb made the identification of the species in his Synopsis, p. 9, and bears 

 his label. 



Ammonites dbntato-carinatus. 

 Plate XL,i, Figs. 3, 4. 



Ammonites dentate -car inatus Roemer : Texas, p. 417 ; Kreid. von Texas, p. 33, PL 

 I, Fig. 2, a, b, c ; Gabb, Synopsis, p. 9 ; Meek, Check List Cretaceous, p. 24. 



A single small fragment of this species comes to me from the collection 

 of the Acad. Nat. Sci. at Philadelphia, labeled as coming from the Creta- 

 ceous of New Jersey, and there seems to be no valid reason for doubting 

 the locality, as it bears resemblance to the white limestone nodtiles from 

 Marlboro and Holmdel, New Jersey. The specimen is but little more 

 than an inch in length, and is a fragment of a volution of medium size, rep- 

 resenting about three of the chambers. The shell when entire has been 



