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Show 1871-] MR. ST. GEORGE MIVART ON HEMICENTETES. 75 orbital process; occiput not sloping much forwards ; praemaxillae peculiarly produced ; lambdoidal ridge traversing summit of cranium ; no ridge or process in front of orbit; a tympanic bulla ; no alisphenoid canal ; no pterygoid fossa; no paroccipital process ; glenoid surface very small; ascending ramus of mandible very low, peculiarly truncated ; coronoid process very low, a carotid foramen ; a small glenoid foramen; sphenoidal fissure and foramen rotundum represented hy one opening; infraorbital foramen large and single ; lachrymal foramen minute ; true molars each in the form of a triangular prism ; first upper incisor larger than the second ; canine small. Nineteen or twenty dorsal vertebrae ; cervical neurapophyses not very narrow antero-posteriorly ; no cervical hypapophyses; spines of dorsal and lumbar vertebrae well developed ; no hyperapophyses ; no hypapophysial ossicles beneath the lumbar vertebrae; manubrium slightly keeled, but not much enlarged ; clavicles long and very slender ; humerus not very short; ulna complete and distinct ; scapula broad, with a blunt metacromion ; scaphoid and semilunar distinct; no sickle-shaped carpal ossicle or os intermedium ; pelvis widely open below; tibia and fibula anchylosed together inferiorly ; four digits to manus, five to pes ; no caecum ; an ossified tendon in the forearm. Hab. Southern and Eastern Africa. CHRYSOCHLORIS, Lacepede. M . 3-V.', a vesicular enlargement in the temporal fossa; lower molars without any posterior process. CHALCOCHLORIS, St. G. Mivart. M. 2___ 5 u 0 enlargement in the temporal fossa; lower molars with a marked posterior process. TALPIDiE. C. l-~ , M . 5-3. Cranium very broad behind, but not high ; tapering much, but gradually, forwards; greatest breadth behind the posterior roots of the zygomata, which are complete but exceedingly slender arches; occiput inclined much forwards ; no postorbital process; no ridge or process in front of the orbit; temporal fossa small; a tympanic bulla; no alisphenoid canal; mesopterygoid fossa not ending posteriorly in any excavation of the basis cranii; foramen magnum very large; no paroccipital or mastoid processes ; glenoid surface small, and situated high up ; no distinct postglenoid process; ascending ramus of mandible not very low ; supraoccipital enormous; generally a large pterotic ; meatus auditorius externus opening decidedly below the glenoid surface ; a carotid, but no glenoid foramen ; foramen rotundum and spheno-orbital fissure represented by one opening ; infraorbital foramen very large ; lachrymal foramen very small; molars above and below, each formed of two triangular prisms. Cervical neurapophyses very narrow antero- |