gg PALEONTOLOGY OF NEW YORK. 



aperture; central part of the callosity more prominent, and projecting 

 into the apertural cavity beyond the lateral portions. 

 Sorface marked by regular transverse costse or coarse elevated stria?, 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 striae exist in the spaces between the costse, 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 costs, 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 

 Belter ophon propinquus, but which carries the transverse stria> as already described 

 in the species under consideration, except that they are sharply elevated and 

 carinifonn, 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 



