. Bulletin of the British Museum (Natural History), Geology. >S4 MIOCENE CARNIVORA OF EAST AFRICA. 42 41 43 Figs. 41-43. Hyaenodon {Isohyaenodon) matthewi sp. nov. Left mandible with M2-3. (41) Occlusal aspect. (42) Medial aspect. (43) Lateral aspect. Holotype (), Songhor. xi. the paraconid and the shear plane convex outward; the obliqueness of shear is 200, that is much less than in H. (I.) andrewsi. A vestige of the talonid is present and on this unworn tooth a very minute prong is visible on the internal cingulum at about the place where a metaconid would arise if one was present.
. Bulletin of the British Museum (Natural History), Geology. >S4 MIOCENE CARNIVORA OF EAST AFRICA. 42 41 43 Figs. 41-43. Hyaenodon {Isohyaenodon) matthewi sp. nov. Left mandible with M2-3. (41) Occlusal aspect. (42) Medial aspect. (43) Lateral aspect. Holotype (), Songhor. xi. the paraconid and the shear plane convex outward; the obliqueness of shear is 200, that is much less than in H. (I.) andrewsi. A vestige of the talonid is present and on this unworn tooth a very minute prong is visible on the internal cingulum at about the place where a metaconid would arise if one was present. The small talonid of M 2 abuts against the paraconid of M 3, the alignment being maintained by a small buttress; no more of M 2 is preserved on the holotype. On a left M 2 () from Rusinga the protoconid is decidedly higher than the paraconid and a small talonid is present; the shear plane is convexly curved and not as oblique (at 150) as that of M3. is an isolated right M3, indistinguishable from the holotype, but slightly broken on the cusp tips. Hyaenodon {Isohyaenodon) pilgrimi sp. nov. (Text-figs. 44-49) Diagnosis. Small species of Isohyaenodon; about half the size of H. filholi and H. mustelinns. The trivial name is a tribute to G. E. Pilgrim (1874-1943), an outstanding scholar of European and Asiatic Tertiary mammals. Holotype. Pair of complete mandibles with posterior fragment of skull and 7 cervical vertebrae; from Rusinga Island, Kavirondo Gulf, Kenya. Other material. Right mandible with P4, M2+3. Rusinga Island, Kavirondo Gulf, Kenya. Teft mandible fragment with P2+4, Mr Rusinga Island, Kavi- rondo Gulf, Kenya. Upper left M1. Songhor, Kavirondo Gulf, Kenya. Teft lower canine. Rusinga Island, Kavirondo Gulf, Kenya. Description. This species is about the same size as the polecat, Mustela putorius. The two mandibles are complete though separate and only the incisors and P1 are missing. The mandible is abou
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