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Show 1873.] MR. ST. G. MIVART ON THE LEMURS. 499 surface prolonged somewhat down the back of ascending ramus ; digastric fossa more or less deep. Hab. Madagascar exclusively. LEMURINEE. I. y or J-, C. \, Pm. f, M. |, =7-^=32 or 34. Carpus with or without an os intermedium ; os calcis less one fourth the length of tibia; naviculare from about half to nearly twice the length of the cuboid; cartilages of ribs not expanded before piercing the sternum ; no hyperapophyses; spinous processes of lumbar vertebrae elongated, and much inclined forwards ; caudal vertebrae with chevron bones. Hab. Madagascar exclusively. LEPILEMUR. 1.|, C. |, Pm. f, M. f, =4=32. Tail shorter than the body; muzzle longer than the orbit ; first upper premolar more vertically extended than the others ; premolars with only one external cusp; last lower molar with a large fifth cusp; praemaxillae very small; an interparietal bone ; palate very short; posterior palatine foramina small; a small molar foramen ; Dorsal aspect of left tarsus of Lepilemur musfelinus. (Letters as before.) sphenoidal fissure and foramen rotundum together represented by a single opening; angle of mandible produced downwards as well as backwards ; mastoidal region of periotic inflated; articular surface of condyle remarkably prolonged downwards behind; cervical neural laminae slightly notched posteriorly; a very conspicuous median hypapophysial ridge and process beneath the second, third, and |