perfect representation of the Camel, one of the most striking types of the order, while it reminds us at the same time of the Buffalo, the genus _Acronatus_ among the large Antelopes, and numerous other representations of the same form. The fourth type is our _Bos Pusio_: here we find the horns, when present, remarkably small, but in many cases absent; and the size is diminutive to an extreme. These also are distinguishing marks of the groups it is to represent: the _Tenuirostres_ among birds, and the _Glires_, or mice, among quadrupeds, are the smallest of their respective classes; and both are typically distinguished by wanting all appendages to the head, either in the form of crests or horns. The fifth type is, perhaps, the most extraordinary of all; it should represent not only the order _Rasores_ among birds, but also the _Camelopardalis_ among ruminating quadrupeds. Hence we find that, in accordance with the first of these analogies, it is a peaceful domesticated race, and that it has horns of an unusually large size, even in its own group; while, at the same time, those horns have that peculiar structure which can only be traced in the Camelopardalis; they are covered with skin, which passes so imperceptibly to the horny state, that, as Captain Clapperton observes, "there is no exact demarcation where the one commences and the other ends." The five leading types of quadrupeds and birds being now represented, and in precisely the same order, _we demonstrate_ the groups to be natural by the following table:-- GENUS _BOS_--_the Natural Types._ 1. _Bos Scoticus._ Fierce, untameable. FERAE. RAPTORES. 2. ---- _Taurus._ Pre-eminently typical. PRIMATES. INCESSORES. {Appendages on the head} 3. ---- _Dermaceros._ {greatly developed } UNGULATA. RASORES. {Stature remarkably } 4. ---- _Pusio._ {small. } GLIRES. GRALLATORES. {Fore-part of the shoulders} 5. ---- _Thersites._ {elevated } CETACEA. NATATORES.