64 
Aug. F. Foerste 
in the Rochester shales of New York, but is represented also by 
an almost identical form in the Waldron of Indiana and Tennessee. 
Diaphorostoma cliftonensis occurs typically in the Osgood bed of 
Tennessee and Indiana, but is represented by almost identical 
forms in the Clinton. 
Diaphorostoma cliftonensis typically is a smaller shell, with a 
relatively greater height, compared with its width. There are 
about three and a half volutions, and the last volution never 
attains the relative width, compared with the height of the shell, 
which is shown by Diaphorostoma niagarense. Height of largest 
specimen, 20 mm.; width parallel to the aperture, 22 mm.; width 
perpendicular to this diameter, 17 mm.; height of spire above the 
aperture, 7 mm.; above the last volution, a little over 2 mm.; width 
of aperture, 14 mm.; height of aperture, about 15 mm. Shell 
marked by numerous faint striations transverse to the length of the 
volutions. There are no striations parallel to the volutions. 
Osgood bed: Clifton, Tennessee. 
Diaphorostoma brownsportensis. 
(Plate I, Fig. 14.) 
Shell depressed, vertically compressed along the outer margin 
of the last volution; a groove or depression, usually very distinct, 
follows the inner edge of the compressed part along the upper side 
of the volution; a faint depression follows the inner edge of the 
compressed part along the lower side of the volution. Surface 
marked by transverse striae and wrinkles, which are bent back at 
the compressed edge of the last volution, indicating the presence 
of a sinus at the aperture having a maximum length of about 4 
mm. Volutions about 3, contiguous, the last volution very much 
flattened near its beginning but less flattened toward the aperture. 
Resembles Platyceras sinuatum as represented by fig. 5, plate 55, 
vol. iii, of the New York Paleontology.'^ 
Brownsport bed: glade southwest of Brownsport Furnace, three 
miles west of Vice landing; north of landing at Cerro Gordo; hill 
north of Bath Springs; all in Tennessee. 
Games VL-dW.^ N atural History of New York, part vi, Paleontology, Vol. Ill, 
1861. Whenever these volumes are referred to later in this paper they will be 
designated. New York P aleontology. 
