Part 6

— 20. c. ditto, side view.

— 20. d. Ramus of lower jaw—natural size.

— 20. e. Molar teeth of upper jaw.

— 20. f. ditto of lower.

— 21. a. Skull of Reithrodon cuniculoïdes, viewed from beneath.

— 21. b. ditto, side view of fore part.

— 21. c. Ramus of lower pair.

— 22. a. Hinder part of ramus of lower jaw of Abrocoma Bennettii.

— 23. a. Skull of Abrocoma Cuvieri, viewed from beneath.

— 23. b. Lower jaw of ditto, viewed from beneath.

— 23. c. Ramus of lower jaw, inner side.

— 24. a. Ramus of lower jaw of Octodon Cumingii, inner side.

— 25. a. Skull of Didelphis crassicaudata.

— 25. b. ditto, viewed from beneath.

— 25. c. Side view of fore part of skull.

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

XXXV. Skulls of various animals.

Fig. 1. a. Skull of Desmodus D’Orbignyi.

— 1. b. ditto, viewed from beneath.

— 1. c. ditto, side view.

— 1. d. Front view of the incisors, and canines of upper jaw magnified.

— 1. e. Side view of do. and the molar teeth.

— 1. f. Front view of incisors and canines of lower jaw, magnified.

— 1. g. Side view of ditto, and molar teeth.

— 2. a. Skull of Phyllostoma Grayi.

— 2. b. Side view of ditto.

— 2. c. } Front view of incisors of upper and

— 2. d. } lower jaws magnified.