CEPHALOPODA OF THE CRETACEOUS MARLS. 281 
ally seen. Very young specimens often present a long slender extremity. 
On the ventral side, the slit extends fully one-third of the length of the 
shell, where the walls of the upper portion are preserved to near their full 
length, which is seldom the case; its width in the lower half often being 
little more than the thickness of heavy writing paper. The flattening of this 
side of the stylet commences near the base of the slit and extends almost 
to the lower extremity of the guard. On the dorsal side there is a raised 
elongate lanceolate area, which is narrow and prominently angular in the 
upper part of the body, but is flattened or simply depressed convex on the 
surface and gradually widens below the base of the slit so as to become 
from half the entire width of the shell to almost its equal in width, but 
produces a slight angularity on this side throughout the entire length. The 
entire surface is usually much roughened when not worn, the roughening 
being greatest on the ventral side, while laterally this roughening produces 
vascular lines running obliquely backward in crossing from the ventral to 
the dorsal surfaces, and on the raised lanceolate area of the dorsal surface 
the markings are finer and arranged so as to produce. longitudinal lines, or 
interrupted striz. 
I have not, in any of the New Jersey specimens, no matter how well 
preserved, been able to see anything of the rostrum or dorsal extension of 
the upper portion. 
The phragmocone is seldom seen showing the lines of septa, and when 
seen they appear to be only external or marginal. Among the few bearing 
the lines which I have examined none have shown the septa extending 
across. This body is rather abruptly obconical, and is just a little ovate in 
transverse section, one side being a very little angular and with a raised, 
rounded, longitudinal ridge, corresponding to the angularity of the solid 
side of the alveola of the stylet or guard, the side corresponding to the 
fissure of the guard being regularly curved, as is the inside of the cavity 
itself. The lines of septa are very numerous and closely arranged near the 
pointed end, but gradually and regularly increase in distance from each 
other, so that where the diameter of the cone reaches five-eighths of an inch, 
the septa are fully a twelfth of an inch apart. In their direction across the 
cone they are nearly straight, except on the angularity, where they are 
slightly advanced. The position of the siphuncle I have not observed. 
