48 
BULLETIN OF THE LABORATORIES 
ating the striae narrow, rather shallow, imornamented. Length of 
specimen 45 mm., width near the base about 14 mm. 
From C. micronema, which it most resembles, this species differs 
in the greater coarseness of the striae which are hardly half as numer- 
ous, and especially by their sharp curvature toward the aperture thus 
intersecting more acutely at the median groove. 
The species may be compared with C. sub-carbonaria of the Keo- 
kuk group but obviously differs in several characters. Unfortunately 
our specimens do not preserve the surface sufficiently to make the ab- 
sence oLsculpture certain, while the figure has been restored as to the 
aperture and must not be too fully trusted in that respect. Other 
specimens differ from that figured in the less acute intersection of the 
striae at the median suture and seem to have a minute pearling of the 
summits. The number of striae varies from 45 to 70 in one inch. 
Associated with C. newberryi, in the upper division from 50 to 
100 feet above conglomerate II, Newark, Rushville, and near Lou- 
donville. 
CONULARIA GRACILIS, sp. n, 
(Plate VIII, Fig 2, also Plate VI, Fig. 13, vol. iif.) 
In our discussion of C. newberryi in the last volume the differ- 
ences existing between the Conularias of various horizons were refer- 
ed to, especially in the case of the form found at Moot’s run and else- 
where, at a distance of seventy feet below conglomerate I. This 
form is now represented by abundant material and proves to be a 
very distinct and remarkable species. C. newberryi itself seems only 
to occur above conglomerate I, being abundant in shales just below 
conglomerate II and in division III. It is found in the Cuyahoga 
shales and seems to attain the coal-measures. The present species may 
be defined as follows : 
Shell quadrangular, extremely elongate with nearly parallel sides, 
attaining a length of five inches or more. In a specimen 18 mm. wide 
at the base there are eight ridges in one centimeter but they vary with 
their position and size of the specimen. Lateral surfaces flat with but 
a faint median suture, while those of the angles are well defined. The 
summits of the ridges are ornamented by closely set bars parallel to 
the length of the shell which are strictly limited to a zone bordered by 
a depression on either side. The ridges arch gently. Mouth with 
well developed lips. (See Plate VI, Vol. iii.) 
