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PALAEONTOLOGY OF NEW-YORK. 
Tentaculites elosi«*atii§ (n. s.). 
Plate YI. Fig. 16 - 21. 
Body extremely elongated and very gradually tapering to the apex, which 
is sometimes slightly curved; marked by strong, sharp annulations, of 
which more than three occur in the space of the diameter of the tube. 
Section cylindrical. Surface ornamented by fine close annulating striae. 
Length from one to three inches. Annulations four or five in the space 
of a quarter of an inch at the base of the larger specimens, and about 
nine in the same space near the apex. 
This species presents little variation in character, though there are sometimes 
thickened annulations, and the edges of others are often obtuse either originally or 
from weathering. The striae are often very slightly undulating, and in many speci¬ 
mens these marks are obscure towards the apex. Where the shell is exfoliated, the 
surface is smooth, and presents the appearance of a series of reversed truncated 
cones, or short cups, placed one within the other, having all the characters of 
Cornulites. 
Fig. 16. An individual of medium size. 
Fig. 17. An individual of about the same length as the preceding, slightly compressed 
below, giving it an apparently greater breadth at the base. 
Fig. 18. A large individual having a length of three inches. 
Fig. 19. Enlargement of a portion, showing the strim. 
Fio-. 20. An individual from which the exterior shell has been exfoliated, showing smooth 
O 
annulations whose greatest diameter is near the upper edge. 
Fig. 21. A portion of the same enlarged, showing the appearance of the annulations ma¬ 
gnified. 
On one side of the base of the larger specimen, fig. 18, the greater distance 
between the annulations shows the interior structure with more elongate inter¬ 
nodes. 
Geological 'position and locality. In the slialy limestone, and in the Upper Penta- 
merus limestone of the Lower Ilelderberg group : Ilelderberg mountains and 
Schoharie. 
