TABLE OF THE PERIODS OF GESTATION OF THE VARIOUS SPECIES OF THE GENUS BOS.
| Periods | |
| American Bison. | 270 days.—Zool. Proc., 1849. |
| European Bison. | Between 9 and 10 months. |
| Gayal (Domestic) | Over 10 months |
| Gyall | 11 months |
| Indian Buffalo | 10 months 10 days. |
| Gaur | 12 months |
| Domestic Ox. | 270 days |
| Manilla Buffalo. | 340 days |
| Arnee | 12 months |
| Cape Buffalo | 12 months |
| Zebu, or Brahmin Cow | 300 days |
| Musk Ox | 9 months |
To supply the deficiencies in the foregoing Tables, the results of original observations are respectfully solicited. Address the Author or Publisher.
NOTE ON THE AMERICAN BISON.
It was Cuvier, I believe, who first made the statement, that the American Bison is furnished with fifteen pairs of ribs. In this particular he has been implicitly followed by every subsequent writer on the subject. Not being able to refer to a skeleton, and, moreover, never suspecting any inaccuracy in the statement, I followed the received account. But since this work has gone to press, I have had the opportunity of examining two skeletons, by which I find that—
The American Bison has only fourteen pairs of ribs.