224 
PALAEONTOLOGY OP NEW-YORK. 
marked by regular lines of granulations or papillae, which appear to be produced by regular 
transverse and longitudinal depressed striae, the spaces between which are elevated ; shell 
slightly folded inward at the angles, forming a shallow groove, which is partially marked 
by the granulations ; lines of granulations slightly curving upwards, or towards the apex, 
at the angles. 
This species is readily distinguished by the regularly arranged granulations, which are 
separated by equal transverse and longitudinal depressed lines. The surface is more coarsely 
marked than the last, and more distinctly granulated. These granules appear to be capable 
of separation from the shell, leaving small punctures ; or they are hollow pustules, which, 
when worn down, leave a small pit. Such a character is shown by D’Archiac and dp: 
Verneuil in the structure of Conularia gervillei and C. gcrolateinensis , from the older 
deposits of the Rhenish Provinces. 
The specimen figured is completely flattened ; and the longitudinal and transverse 
wrinkles, shown in the figure, are, in part, due to this pressure. The fragment here given 
diminishes towards the apex less rapidly than either of the preceding. 
Fig. 3 a. An imperfect specimen, of the natural size. b. A portion magnified. 
Position and locality. This species occurs in the higher part of the Trenton limestone, 
near Middleville. 
290. 4. CONULARIA GRACILE (n. sp.). 
Pl. LIX. Figs. 4 a, b. 
Slender, conical or pyramidal, slightly bent or arcuate ; angles sulcate, and a scarcely 
conspicuous depressed line along the centre of each side ; surface marked by sharp un¬ 
dulating transverse striae, and scarcely conspicuous longitudinal ones. 
This species is more narrow and elongated than either of the preceding ; the grooves 
on the angles are shallow, and the shell has less the appearance of being folded inwards 
along this line. The transverse striae are regularly arched downwards, or towards the mouth 
of the shell, between the straight longitudinal ones. The shell appears to be exceedingly 
thin and fragile. 
The three last species are comparatively rare, while the first is abundant. They are 
apparently quite distinct in character, and, though much flattened, preserve the general 
aspect of other species of the genus. From the minute and indistinct markings, I had been 
inclined, on hasty examination, to refer them to the inner side of partially exfoliated shells 
of the C. trentonensis ; but that species never presents any similar markings, either as casts 
or partially exfoliated surfaces. We are able to add, therefore, to this genus, comparatively 
rare in species, four new forms from one of our older rocks, in a position lower than they 
have been before discovered. 
Fig. 4 a. A specimen, natural size; the apex broken off. 
Fig. 4 b. A portion of the surface enlarged. 
Position and locality. In the shaly upper part of the Trenton limestone near Middleville. 
