96 
BULLETIN OF THE LABORATORIES 
GENUS PLEUROTOMARIA, De France. 
IV. PLEUROTOMARIA INEXPECTANS, Hall and Whitfield. 
Shell described in Ohio Pal. Vol. II. 
Locality and positmi. Iron ore beds of Clinton County, Clinton 
Group. 
GENUS CYCLORA, Hall. 
V. CyCLORA ALTA, sp. n. 
{Plate XIV, Figs. 17 a, b.) 
Shell very small, conoid subglobose; spire varying from two-thirds 
to slightly more than the diameter of the last volution ; volutions three 
or four, increasing in size rapidly, but evenly ; the last volution not so 
disproportionate in size to the rest of the shell as compared with the 
species so far described ; suture deep ; surface smooth ; umbilicus 
small ; aperture circular. 
Height of largest specimen seen, 4mm.; breadth, 3.5 mm. Height 
of a specimen of the usual size, 2 mm.; breadth, 2.75 mm. From 
this varying to specimens only 1 mm. broad. 
This shell differs from the species of Cyclo 7 'a so far described in its 
greater size, greater elevation of the spire, and the more regular in- 
crease of its volutions. Its general form approaches that of the 
closely related genus Holopea. Since the chief distinction, however, 
of the first genus is its diminutive size, it may be safe to refer to it 
also the specimens here described. 
Locality and position. Beavertown marl, Huffman’s Quarry, Clinton 
Group ; not scarce (Name intended to suggest the height of the 
spire, as compared with other -species of this genus.) 
GENUS STROPHOSTYLUS, Hall. 
VI. Strophostylus cyclostomus. Hall. 
{Plate XLV, Fig. 15.) 
Shell transversely broad-oval. Spire moderately elevated ; volu- 
tions in the specimen figured, three, a fourth having broken away; 
the last volution by far the largest, ventricose. Aperture not fully 
exposed, oblique to the axis, subcircular. 
Surface marked by shallow, broad striae and closer, finer striations 
crossing the volutions obliquely and in a direction opposed to them. 
