36 PALEONTOLOGY OF NEW-TOEK. 



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 

 'Taargin of the volution, there is some appearance of the existence of a siphuncle. 



It will be observed in both the figures referred to, that each 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 rounded and retiring. 



PLATE LXXVII. 



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 c^ 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 showB that the horizontal diameter of the 

 volution decreases, while the vertical diameter increases towards the aperture. 



Fig. 1 c. A transverse section just above 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 Gebhahd 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. f 



Position and locality. In the Coralline limestone at Schoharie. 



(Collection of John Gebhard junior/) 



