82 
AUG. F. FOERSTE 
In one specimen the surface of the shell curves upward on 
approaching the suture above, somewhat as in Hormotoma sal- 
teri canadensis Ulrich, but in the remainder this feature is 
not noted. 
This form ma}^ eventually prove to be only one of the many 
variants of Hormotoma trilineata, but at present it appears suffi- 
ciently distinct to warrant a different name. 
Locality and horizon.^ — Quarry | mile northeast of Center- 
ville, Ohio; in the argillaceous beds immediately beneath the 
Brassfield formation. 
Remarks.- — Compared with Hormotoma suhulata (Conrad) 
the volutions of this species are relatively shorter. It is similar 
in size and in the number of volutions to Hormotoma tenera 
Savage, but the surface features of the latter are not known, 
so that exact comparison is impossible. 
Liospira (?) depressum Sp. nov. 
Plate X/F, jig. 16 
Shells attaining a height of 5.5 mm. and a maximum diameter 
of 13 mm. Spire very depressed. Omitting the last half of 
the last volution, the height of the apical part of the spire over 
the remainder of the shell equals slightly more than 0.5 mm.; 
above the aperture it rises about 2 mm., most of this elevation 
being due to the downward curvature of the last half of the last 
volution. There are 4 volutions, enlarging to a width of slightly 
more than 4 mm. at the aperture of a shell 5.5 mm. in diameter. 
Toward the apical end the cross-sections of the volutions are 
more nearly circular, but along the last volution the depression 
of the shell becomes increasingly obvious, and at the same time 
there is a moderate obliquity of the upper surface of this volu- 
tion, especially toward the aperture. The umbilicus is about 
2 mm. in diameter. Along the last half of the last volution this 
umbilicus is bordered by a callous deposit along the inner margin 
of this part of the volution. This deposit varies from 1 to 1.2 
23 Idem., pi. 70, fig. 48. 
