PTEROPODA. 
211 
The length of one specimen, imperfect at both extremities, is about ninety 
millimetres; the other, incomplete at the apex, is about eighty millimetres 
long; the shortest diameter at the base is about twenty millimetres, and the 
longest about thirty millimetres. 
Formation and localities. In the soft calcareous shales of the Hamilton group 
of New York, in the Genesee Yalley near Moscow, and in the coarser shales of 
the group at Morrisville in Madison county. 
Conularia Cayuga. 
PLATE XXXIV. FIGS. 2, 5. 
Conularia Cayuga, Hall. Illustrations of Devonian Fossils : Pteropoda, plate 28, figs. 2, 3. 1876. 
Form elongate-pyramidal, the adjacent faces apparently equal, and gradually 
expanding from the apex. The transverse section unknown, as also the 
form of the aperture. Faces of the pyramid apparently a little convex, 
with a shallow, depressed, median line, and strongly marked furrows at 
the angles. The summit is truncated. 
Surface marked by moderately strong, sharply elevated strife, with interspaces 
about three or four times as wide in the earlier growth of the shell, and 
becoming much narrower towards the base of the pyramid; the strife 
minutely tuberculose on their crests, and the interspaces striate; the 
direction of these strife sometimes nearly vertical, but usually oblique, 
and in some parts distinctly diverging from the median line. 
The surface characters, as given above, are drawn from a gutta-percha 
impression, taken from a mould of the exterior, from which the shell had, for 
the most part, been dissolved and removed, but with small portions remaining, 
which show the internal surface. 
This species, in its general form, is not dissimilar to C. undulata, but the 
strife are stronger, and the interspaces between them are much greater, 
especially in the upper part of the shell, while towards the aperture these 
spaces are very narrow, and the strife much crowded. The presence of strife 
crossing the interspaces is a distinctive feature; but these are not visible in all 
