1036 THE PALEONTOLOGY OF MINNESOTA. 
(Helicotoma declivis. 
Hexicotoma peciivis Safford. 
PLATE LXXIV, FIGS. 34—38. 
Helicotoma declivis SAFFORD, 1869, Geol]. of Tenn., p. 288. (Neither defined nor illustrated.) 
This species is remarkable especially for two reasons: first, the umbilical cavity, which is rather 
wide, has even slopes on which the inner whorls are more or less obscurely or quite indistinctly defined ; 
second, the upper surface of the whorls is raised so as to form a broad, obtuse, median angulation or ridge. 
The inner whorls of the spire are depressed slightly beneath the level of the outer one while the notch- 
carina is so small that it fails to rise to the level of the median ridge. 
Formation and locality.— Associated with H. tennesseensis in the lower part of the Stones River group 
at Murfreesboro, Tennessee. E 
Collections.—Prof. J. M. Safford; E. O. Ulrich. 
Heticotoma marerinata, n. sp. (Ulrich.) 
PLATE LXXIV, FIG. 39. 
Of this species we have seen but the unique example of which a view of the upper side is given on 
plate LXXIV. It is remarkable chiefly because the lower part of the outer side of its whorls is so promi- 
nently developed that it projects like a broad flange. 
Formation-and locality —Found at the extreme top of the Richmond group, Elkhorn falls, near Rich- 
mond, Indiana. 
Collection.—E. O. Ulrich. 
Genus ECCYLIOMPHALUS, Portlock. 
Eccyliomphalus, PoRTLOCK, 1843, Geol. Rep. Lond., p. 411. 
For remarks on this genus see pages 1024 and 1029. 
EccyLioMPHALUS UNDULATUS Hall. 
PLATE LXXYV, FIGS. 19—23. 
Ecculiomphalus undulatus HALL, 1861, Geol. Rep. Wis., p. 87; WHITFIED, 1895, Mem. Am. Mus, Nat. 
Hist., vol. i, pt. 2, p. 63, plate vii1, figs. 1—3. 
Original description.—“Shell consisting of one or two volutions, spirally coiled, but distantly separated 
from each other, rapidly increasing in size from the apex, and of asubtriangular or ovate-triangular form, 
the upper side being convex and curving to the ventral margin; the dorsum is somewhat flattened, and 
the lower side sloping with a gentle curve from the lower lateral angle to the ventral side, which is narrow 
and sharply rounded. Along the ventral side and a little below the center there is a narrow, abruptly 
depressed groove, which extends the entire length of the shell. 
‘*Surface of the shell marked by obscure undulations, which are most distinct on the lower lateral 
angle, also on the lower side by two or three revolving ridges.* Fine transverse lines of growth parallel 
to the margin of the aperture are visible over the greater part of the surface of the specimen, which is 
essentially a cast of the interior.” 
To the above description we may add that there is a broad sinus in the upper part of the mouth, 
and that the depressions on the outer side of the shell are due to agglutinated foreign objects like fragments 
~~ * We do not understand what is meant by the ‘‘two or three revolving ridges” on the lower side, since we have not 
observed anything of the kind on our specimens. That the latter are specifically identical with Hall’s species we are 
confident after seeing Whitfield’s figures of the original type (loc. cit.). 
