122 
PALEONTOLOGY OF NEW YORK. 
without specific name. From the Hudson river, Trenton and lower formations, 
nine species of Bucania have been described. At the same time about twenty 
species of Bellerophon proper have been described from all the formations 
below the Devonian. 
The geographical distribution of the species herein described, appears, with 
few exceptions, to have been quite limited. Bellerophon Pelops occurs in Ohio as 
well as in New York. B. patulus B. Leda and B. Lyra have been found at the 
Falls of the Ohio in the same horizon which they occupy in the State of New 
York. B. patulus has also been found in the same horizon in Maryland and 
Virginia, in the arenaceous, calcareous and mud shales, and in the limestone 
of the formation, and probably occurs in the Hamilton group of Pennsylvania, 
having the widest distribution of any of the species, and being far more 
numerous in individuals than any other form. 
Since the preceding pages were printed, 1 have received from Dr. John S. 
Newberry the originals of the species Bellerophon propinquus and B. Newberryi, for 
the purpose of comparison with the specimens in my possession. Among 
these are six individuals and several fragments of the latter species in various 
conditions of preservation. In the two larger individuals, one presents no 
evidence of dorsal band farther than in the one figured on plate 22, while 
in the other a faint indication of such character may be detected. Several of 
the smaller individuals show a distinct band on the posterior part of the outer 
volution, which, in some at least, becomes obsolete on the anterior expansion. 
The transverse costae become gradually obsolete on the sides of the shell, 
and merge into the ordinary striae of growth before reaching the umbilicus. 
The same is also true of the anterior portion of the shell, which appears to be 
marked only by striae of growth. In well-preserved specimens the transverse 
costae are all cancellated by distinct, rounded, revolving striae, which also 
become obsolete on the anterior portion of the last volution. When the last 
volution is fully preserved, the peristome is very abruptly expanded ; the 
columellar lip is always more or less covered by a callus, either as represented 
in figure 16 of plate 22, or extending forward at the sides, as shown in B. 
