GASTROPODA. 1003 
Eotomaria labiosa.] 
Eoromaria LABtosa, 2. sp. (Ulrich.) 
PLAT! LXIX, FIGS, 15-17. 
Width about 24 mm., hight about 20 mm.; apical angle 90°; volutions four and a half or five. 
This species is associated with, and in most respects greatly resembles, FE canalifera. Carefully 
compared, however, several minor differences, as well as one that must be regarded as important, will 
soon convince the observer that the two forms are less closely related than the first superficial glance may 
lead one to suppose. The principal difference lies in the relative development of the inner lip. This is 
somewhat excavated dnd much stronger in EH. labiosa, while the lower border also is expanded in a way 
that has not been observed in H. canalifera. Among other differences we may mention that the upper 
sloping surface of the whorls is on the whole flatter, the band less sharply defined, the surface markings 
more obscure, the base more ventricose, and the umbilical perforation even smaller than in that species. 
Formation and locality—Lower division of the Stones River group, Murfreesboro, Tennessee. 
Collection. —E. O. Ulrich. 
HOTOMARIA VICINA, 2. Sp. 
PLATE LXIX, FIGS, 18-20. 
Shell rather small, 14 to 20 mm. wide, 10 to 14 mm. high, depressed conical above the angular 
periphery, moderately ventricose beneath; apical angle 97° in one specimen, 107° in another. 
Volutions four, the upper sloping surface nearly flat, the last a little convex above near the slightly 
impressed suture line. Band only moderately distinct, apparently more nearly vertical than usual for 
the genus. Umbilicus equalling nearly a fourth of the width of the shell, the convex base turning rather 
abruptly into it.* Lines of growth showing obscurely on casts of the interior, rather strongly defined 
exteriorly, particularly upon the under side. On the upper slope they curve strongly backward from the 
suture to the band, on the lower surface very slightly forward. 
The umbilicus is larger and the anterior outline of the lower lip less curved than in either of the 
preceding species. In both of these features it agrees with H. dryope Billings sp., with which it is also 
found associated in Minnesota, but the relative flatness of the upper slope of the whorls distinguishes it 
readily from that species. 
Formation and locality.—Stones River group, Minneapolis, Minnesota, and Mineral Point, Wisconsin. 
_ Collections.—G-eological and Natural History Survey of Minnesota; E. O. Ulrich. 
Museum Register, No. 5106. 
Eoromarta DRYOPE Billings. 
PLATE LXIX, FIGS. 21-25. 
Pleurotomaria dryope BILLINas, 1865, Pal. Foss., vol. 1, p. 170. 
This well-marked species differs from H. vicina in the contour of the upper side of the whorls, the 
outer two-thirds or three-fourths of the slope being decidedly concave, the remaining fourth next the 
suture convex. In other respects the two species agree very closely. 
Although the surface markings in our specimens are not as regular as in Billings’, figures, the 
resemblances in all other particulars are so exact that we cannot doubt for a moment that they are spe 
cifically identical with the Canadian types. We notice a slight difference between the specimens obtained 
from the Stones River group and those from the Black River limestone. In the latter the apical angle is 
not so wide, being about 100°, while the whorl next to the last is, as described by Billings, “ slightly 
*In the reproduction of figure 20 on plate LXIX some of the shading failed to “come up,” causing the umbilicus to 
appear narrow er than it is in the specimen. 
