[48] In the young there are four of these small additional teeth, but the outer pair disappear after a short time.
[49] The upper teeth always constitute a larger segment of a smaller circle than the lower ones.
[50] The genus Heliophobius among the Mole Rats is described as having six molars on each side in both jaws; but the number in this genus appears to be variable, the sixth molar being often undeveloped.
[51] See Note on p. 83.
[52] Having the hind feet hand-like.
[53] See Arvicola rutilus, p. 117.
[54] Dr. Coues has proposed this generic name for the American Jumping Mouse, as the names Jaculus and Meriones, given to the genus by various authors, had been previously used for other groups.
[55] Described almost at the same time by M. Bravard under the name of Typotherium. We here employ M. Serres’ name.
[56] Waterton’s “Wanderings,” pp. 161, 284.
[57] Arctopithecus castaniceps.