GASTEROPODA. 
47 
Loxonema delphicola. 
PLATE XIII, FIGS. 19-25, AND PLATE X1Y, FIGS. 1, 2. 
Loxonema delphicola, Hall. Descriptions of New Species of Fossils, etc., p. 24. 1861. 
“ “ “ Fifteenth Rep. N. Y. State Cab. Nat. Hist., p. 62, pi. 4, f. 9. 1862. 
“ “ “ Illustrations of Devonian Fossils: Gasteropoda, plates 13 and 14. 1876. 
Shell turretiform; spire somewhat rapidly ascending. Volutions eight or more 
in the entire shell, flattened upon the sides, the last one slightly ventri- 
cose. Aperture ovate, narrowed and attenuated at the base; columella 
thickened and extended below. 
Surface marked by strong, not prominent, longitudinal striae, which are bent 
slightly back for a short distance below the suture, and continue in a 
nearly direct or slightly curving line almost to the base of the volution, 
where they bend forward to the suture-line. Suture banded, or the upper 
edge of the volution overlapping the next preceding, and constricted just 
below the margin, which is but faintly or not at all marked by the longi¬ 
tudinal striae. 
This species differs from the more common form of the Loxonema of the 
Hamilton group in the lesser convexity of the volutions, and more rapid expan¬ 
sion from the apex, straightness of the striae (which, however, are more 
abruptly bent on the last volution) and the overlapping or banding of the upper 
margin of the volution at the suture-line. One specimen examined retains 
nearly six volutions, and has a length of one inch and a half, which would 
have been slightly increased, had the lower extension of the columella been 
entire; ^diameter of last volution a little more than half an inch. A specimen 
of the ordinary form (L. Hamiltonice), possessing six full volutions, measures one 
inch and a quarter in length ; the six volutions, from the aperture reaching to 
the height of the fourth volution in the species under consideration. In the 
ordinary flattened or crushed condition of these fossils, as they occur in the 
finer shales of the group, the distinction between the two species is not always 
easily recognized. 
Formation and localities. In shales of the Hamilton group; Delphi, Onondaga 
county, Bellona, Yates county, and shores of Cayuga lake, N. Y. • 
