﻿41 Distribution of Species 15 



bers in the siliceous portions of the rock ", and " it occurs in the 

 lower and middle parts of the mass." Our specimens were found 

 in the upper middle portion of the section, but they were not in 

 great numbers. - fu 



Holopea (?) raymondia, sp. nov. . PI. 3, Figs. 12, 13. 



Shell rather flat, spire elevated but little above the outer volu- 

 tion, sometimes nearly on the same plane ; volutions three or 

 four, enlarging very gradually from the apex ; aperture and sur- 

 face unknown. Diameter of two shells 5 mm. and 10 mm. 

 respectively. Turbo dilucula Hall enlarges very rapidly and the 

 spire is much elevated in comparison with H. (?) raymondia. 

 Distribution. — A number of specimens of this species were found 

 at Little Falls, but none were in a perfect state 

 of preservation. Collected and loaned by Mr. 

 C. H. Flory. 



Tryblidium patulum, sp. nov. PI. 3, Figs. 14, .15.' 



Shell small, having a length of 10 mm., a width of 6 mm., and 

 a height of 3 mm. The specimen may be slightly compressed 

 laterally, in which case the proportions will be slightly different. 

 The general outline of the aperture is oval with the greatest 

 width posteriorly. Apex anterior, narrow and curved, very 

 slightly elevated above the margin, if at all, and projecting be- 

 yond it. The shell is strongly convex transversely and, in our 

 specimen, the sides are almost parallel near the aperture. In 

 the longitudinal section the curve is greatest on the anterior and 

 decreases rapidly toward the posterior. Surface unknown. 



This species resembles T. simplex Whitfield (Am. Mus. Nat. 

 His. Bull., Vol. 1, No. 8, pi. 24, figs. 30, 31, p. 366), but differs 

 from it in several particulars. It is smaller, the beak does not 

 project be3^ond the body of the shell as in T. simplex and the 

 outlines of the aperture is widest posteriorly. 



Distribution. — A single specimen was found in a cherty bed at 

 Dittle Falls, N. Y. (See H. voluta. ) 

 Ophileta complanata Vanuxem 



O. complanata, Geology Third District N. Y., 1842, p. 36, fig. 2. 



Pal. N. Y., Vol. 1, p. 11, fig. 3 and pi. 3, fig. 6. 



Am. Mus. Nat. His., Bull., Vol. 2, p. 48, pi. 7, figs. 18 to 25. 

 Schizostoma complanata, N. Y. State Mus., Bull. 65 1903, p. 561. 



The description given by Vanuxem is as follows: " \_0. com- 

 planata'] consist [s] of many convolutions resembling a single coil 



