Part 7

— 3. a. Skull of Vespertilio Chiloensis.

— 3. b. Side view of ditto.

— 3. c. Front view of upper and lower incisors magnified.

— 4. a. Skull of Lutra Platensis.

— 4. b. Under view of ditto.

— 4. c. Side view of fore part of ditto.

— 4. d. Upper view of lower jaw of ditto.

— 5. a. Skull of Didelphis elegans.

— 5. b. Under view of ditto.

— 5. c. Side view ditto.

— 5. d. Ramus of lower jaw, outer side.

— 5. e. The same, viewed from above, and magnified.

INDEX TO THE SPECIES.

Page Abrocoma Bennettii 85 —— Cuvieri 86 Auchenia Llama 26 Canis antarcticus 7 —— Azaræ 14 —— fulvipes 12 —— Magellanicus 10 Cavia Cobaia 89 —— Patachonica 89 Cervus campestris 29 Ctenomys Braziliensis 79 Dasypus hybridus 92 —— minutus 93 Delphinus Fitz-Royi 25 Desmodus D’Orbignyi 1 Didelphis Azaræ 93 —— brachyura 97 —— crassicaudata 94 —— elegans 95 Dysopes nasutus 6 Felis domesticus 20 —— Pajeros 18 —— Yagouaroundi 16 Gallictis vittata 21 Hydrochœrus Capybara 91 Kerodon Kingii 88 Lagostomus trichodactylus 88 Lepus Magellanicus 92 Lutra Chilensis 22 —— Platensis 21 Mus arenicola 48 —— bimaculatus 43 —— brachiotis 49 —— Braziliensis 58 Mus canescens 54 —— Darwinii 64 —— decumanus 31 —— —— var. Maurus 33 —— elegans 41 —— flavescens 46 —— fuscipes 66 —— Galapagoensis 65 —— Gouldii 67 —— gracilipes 45 —— griseo-flavus 62 —— Jacobiæ 34 —— longicaudatus 39 —— longipilis 55 —— Magellanicus 47 —— micropus 61 —— Musculus 38 —— nasutus 56 —— obscurus 52 —— Rattus var. Insularis 35 —— Renggeri 5 —— tumidus 57 —— xanthopygus 63 —— xanthorhinus 53 Myopotamus Coypus 78 Octodon Cumingii 82 Phyllostoma Grayi 3 —— perspicillatum 4 Poephagomys ater 82 Reithrodon chinchilloïdes 72 —— cuniculoïdes 69 —— typicus 71 Vespertilio Chiloensis 5

LONDON: PRINTED BY STEWART AND MURRAY, OLD BAILEY.

MAMMALIA,

Described by

GEORGE R. WATERHOUSE, ESQ. CURATOR OF THE ZOOLOGICAL SOCIETY OF LONDON, ETC. ETC.

WITH

A NOTICE OF THEIR HABITS AND RANGES,

BY CHARLES DARWIN, ESQ. M.A. F.G.S. &c. CORRESPONDING MEMBER OF THE ZOOLOGICAL SOCIETY.

MAMMALIA.

FAMILY—PHYLLOSTOMIDÆ.

DESMODUS D’ORBIGNYI. PLATE I. Natural size. Skull, teeth, &c. Pl. XXXV., figs. 1.

D. pilis nitidis adpressis; corpore suprà fusco, pilis ad basin albis; gulâ abdomineque cinerescenti-albis; nasûs prosthemate parvulo bifido.

DESCRIPTION.—The fur of this Bat is glossy and has a silk-like appearance; that on the top of the head, sides of the face, and the whole of the upper parts of the body, is of a deep brown colour; all the hairs on these parts, however, are white at the base. The flanks, interfemoral membrane, and the arms, are also covered on their upper side with brown hairs. On the lower part of the sides of the face, and the whole of the under parts of the body, the hairs are of an ashy-white colour. The membrane of the wing is brownish. The ears are of moderate size, and somewhat pointed; externally they are covered with minute brown hairs, and internally with white. The tragus is also covered with white hairs; it is of a narrow form, pointed at the tip, and has a small acute process in the middle of the outer margin. The nose-leaf is pierced by the nostrils, which diverge posteriorly, and is so deeply cleft on its hinder margin, that it may be compared to two small leaflets joined side by side near their bases. These leaflets, unlike the nose-leaf of the Phyllostomina, lie horizontally on the nose to which they are attached throughout, a slight ridge only indicating their margin. Around the posterior part of the nose-leaf there is a considerable naked space, in which two small hollows are observable, situated one on each side, and close to the nose-leaf; and, at a short distance behind the nose-leaf, this naked membrane is slightly elevated, and forms a transverse fleshy tubercle.

In. Lines. Length of head and body 3 3 interfemoral membrane 0 3½ the antibrachium 2 2 thumb (claw included) 0 8 tibia 0 10 tarsus (claw included) 0 8⅓ ear 0 4 tragus 0 3 nose-leaf 0 2¼ Expanse the wings of 12 8

Habitat, Coquimbo, Chile. (May.)