336 
PALEONTOLOGY OF NEW-YORK. 
the outer volution shown in fig. 2, pi. 77, in which septa are but indistinctly visible, we have 
the specimen as shown in fig. 1 a, pi. 77 a, in which the septa are strongly shown on the inner 
angle and base of the volution, as well as on the side within the umbilicus. Towards the outer 
margin of the volution, there is some appearance of the existence of a siphuncle. 
It will be observed in both the figures referred to, that eatdi successive volution is visible in 
the umbilicus, extending beyond the one next below. This arises from the inner basal angle of 
each volution projecting, while the upper inner angle is raunded and retiring. 
PLATE LXXYII. 
Fig. 2. View of the base of a specimen, looking into the deep umbilicus. 
PLATE LXXVII A. 
Fig. 1 a. View of the base of the preceding specimen, after the removal of the last volution, 
showing the direction of the septa. 
Fig. 1 b. The base of another specimen, which has the upper portion enclosed in solid limestone. 
The higher visible portion shows the marks of septa. The specimen shows the volu¬ 
tion towards the aperture narrower than above. This feature may be partly due to 
pressure; though in other specimens it is shown that the horizontal diameter of the 
volution decreases, while the vertical diameter increases towards the aperture. 
Fig. 1 c. A transverse section just ab*ove the first volution. The lower angle in this figure re¬ 
quires to be carried farther to the right. 
Fig. 1 d. A transverse section, about one half or two-thirds of a volution above the aperture. 
Position and locality. In the Coralline limestone at Schoharie. 
(Collection of John Gebhard junior.) 
702. 2. TROCHOCERAS TURBINATA ( n . sp.). 
Pl. LXXVII. Fig. 1. 
Turbinate; spire elevated; volutions about six, ventricose; shell nearly twice as high as 
wide ; siphuncle subdorsal; surface striated. 
Two specimens having the form of fig. 1 have been examined, both presenting the same 
general characters. In the one figured, the last volution is broken away, leaving a portion of 
the striated shell adhering to the base of the next whorl as shown in the figure. Where the 
latter is worn and slightly weathered, there appears a cylindrical tube, with septa attached at 
equal distances. This feature is fully exposed for a short distance, and its form can be traced 
beneath the surface still farther. 
With this evidence, I can not hesitate to refer the specimens to the same genus as the one 
previously described. 
Position and locality. In the Coralline limestone at Schoharie. 
(Collection of John Gebhard junior.) 
