[17]. See Proceedings of the Zoological Society for February 14th, 1837, p. 19.
[18]. As I shall have occasion to use the terms moderate, long, short, large, &c. it may be well to state that I take the common mouse, (Mus Musculus,) as my standard of comparison. The ears, feet, tail, length of the fur, general proportions, &c. are in that animal what I term moderate.
[19]. A long tarsus is generally accompanied by a proportionately long tail. I presume that those Mice which have long tarsi are in the habit of making great leaps, and that in these leaps, the tail serves to steady and balance the body.
[20]. In Mus leucopus of North America the tarsus is hairy beneath, and in the character of the teeth this animal also agrees with the species above mentioned.
[21]. The dimensions given in the Proceedings of the Zoological Society were taken from a younger specimen than those here described, and there is an error in the length of the tail there given, which should be 1–10 instead of 2—10.
[22]. In Mus longipilis and M. brachiotis may be perceived an approach to this elongated form of the muzzle.
[23]. I am sorry to say the artist has not drawn this skull with his usual fidelity, a circumstance which I did not perceive until it was too late to make any alteration: it is too large, and the incisors are represented as projecting forwards too much; they are in the original so nearly at right angles with the upper surface of the skull that but a very small portion of them is seen, when it is viewed, as represented at fig. 3, a.
[24]. It is not easy to measure the width of the ears in these animals: upon measuring with a thread over the curve of the outer side I have found the width of the ears of the present animal to be as above given,—the dimension slightly exceeding that stated in the Proceedings of the Zool. Soc.
[25]. Ρειθρος, a channel; Οδον, a tooth.
[26]. The tail is imperfect.