250 PALEONTOLOGY OF 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 differs 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 distinct 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 DENTATO-CARINATUS. 
Plate xui, Figs. 3, 4. 
Ammonites dentato-carinatus 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 nodules 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 
