224 PALEONTOLOGY OF NEW-YORK. 



marked by regular lines of granulations or papillEe, 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 dk 

 Verneuil in the structure of Conularia gervillei and C. gerohteinensis, 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 cither 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.5p.). 



Pl. LIX. Figg. 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 abimdant. 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 6. A portion of the surface enlarged. 



Position and locality. In the shaly upper part of the Trenton limestone near Middleville. 



