OF DENISON UNIVERSITY. 
21 
Macrocheilus s/?? 
(Plate II, Fig. i6. ) 
A single specimen, pretty well preserved, but unfortunately not 
displaying the characters of the columella, seems to indicate a species, 
of Macrocheilus, about the size and form of M. ^nedialis, Meek and 
Worthen. The aperture is narrower, however, and the form of its 
lower angle is different. It is also but little larger than M. siLbco 7 'pu- 
lentus of Whitfield, but until figures of the latter appear it will be im- 
possible to compare them. 
Macrocheilus sp ? 
(Plate II, Fig. 2.) 
A second species is recognized from a badly flattened specimen^ 
which is perfect enough, however, to show that the species is very like 
M. planus, though in its present condition it seems much more robust. 
In size and number of volutions it agrees very fully. 
Pleurotoinaria sp? 
Figures ii and. 13 of Plate II, indicate a species of this genus 
with rather high conical spire and revolving as well as obliquely decus- 
sating striae. I am not able to suggest its specific affinities. 
Pleurotojviaria neivportensis, White (?) 
(Plate II, Fig. 18.) 
Volutions about five, regularly rounded, very convex, and rap- 
idly diminishing in size ; spire short ; lower whorl marked by a spiral 
band originating at a notch in the margin of the aperture, consisting 
of an elevated striated ridge ; otherwise marked with numerous revolv- 
ing lines of which some are larger than others and separated by one 
or two of the smaller lines. It is by no means certain that our form 
is really this species. In the first place, the shell is flattened obliquely 
by pressure, so as to greatly distort the aperture and otherwise alter the 
form. Evidently, however, it was a shell of similar form and general 
appearance with P. newportensis. The strice differ in being more nu- 
merous, though the obliteration of the minuter sort would remove this 
difference. P. newportensis is further described : Aperture sub-cir- 
