98 
PALEONTOLOGY OF NEW YORK. 
aperture; central part of the callosity more prominent, and projecting 
into the apertural cavity beyond the lateral portions. 
Surface marked by regular transverse costfe or coarse elevated strife, which 
are slightly bent backward on approaching the centre of the dorsum, 
along a gentle undefined depression. 
The specimens examined are not sufficiently perfect to determine whether 
fine strife exist in the spaces between the costfe, as in B. patulus; but the 
surface is probably of the same character as in that species. 
Upon a cursory examination, this species, as presented in the specimens 
examined, may be readily confounded with B. patulus; but it is distinguished 
by the somewhat flattened dorsum (which in three specimens examined 
show a slight depression), by the slightly less arching costfe, the nearly or 
entirely closed umbilicus, and a strong, smooth, flattened callosity covering 
the columellar side of the aperture. The specimens at hand offer no means 
of determining the extent of the expansion of the outer lip, which has 
probably been much less than in B. patulus of the Hamilton group of New 
York. 
Formation and locality. In the Upper Helderberg limestone, at Dublin, Ohio. 
Note. The description above has been drawn from specimens collected at 
Dublin, Ohio (the one figured not being at present accessible to me). In the 
absence of all evidence of dorsal band, I would scarcely be warranted in refer¬ 
ring it to B. Newberryi, though that species and B. propinquus, of Meek, are the 
only ones mentioned in the Ohio Reports as occurring at that locality. The 
printing of this form has been delayed in the hope of obtaining characteristic 
specimens of B. Newberryi for comparison; and in the meantime Prof. Orton, of 
Columbus, has sent to me an imperfect specimen, labelled by Mr. Meek’s hand 
Bellerophonpropinquus, but which carries the transverse striae as already described 
in the species under consideration, except that they are sharply elevated and 
cariniform, while there is a distinct, slightly elevated dorsal band, crossed by 
distant arching striae, the whole scarcely rising so high as the adjacent parts of 
the volution. With the information before me I can only conclude that the 
