. Bulletin of the British Museum (Natural History), Geology. EAST AFRICAN CHALICOTHERES 213 Several basal phalanges of Schizotherhim turgaicum are figured by Belyaeva (1953, pi. 3), and five specimens of S. priscum were examined in Paris (Text-fig. i6d). In each species the phalanges show a variety of size and form, but they cannot be allocated to the different digits on the same basis as in Chalicotherinm. Filhol's (1893) drawings of the metapodials of S. priscum indicate that the phalanges of the pes are probably larger than those of the manus, at least on digits III and IV, as in Grangeria
. Bulletin of the British Museum (Natural History), Geology. EAST AFRICAN CHALICOTHERES 213 Several basal phalanges of Schizotherhim turgaicum are figured by Belyaeva (1953, pi. 3), and five specimens of S. priscum were examined in Paris (Text-fig. i6d). In each species the phalanges show a variety of size and form, but they cannot be allocated to the different digits on the same basis as in Chalicotherinm. Filhol's (1893) drawings of the metapodials of S. priscum indicate that the phalanges of the pes are probably larger than those of the manus, at least on digits III and IV, as in Grangeria (Colbert 1934) : the largest phalanx in Paris is about as wide as the distal end of the third metatarsal. Most specimens resemble in general proportions those of digit III of the manus of C. nisingense, but they may be distinguished by the much more proximal orientation of the metacarpal (metatarsal) facet, which occupies less than one-third of the dorsal surface. In side view the distal trochlear keels are less convex, permitting less rotation of the middle phalanx. Intermediate volar tubercles are frequently present, as in C. nisingense. In a few specimens (one of S. priscum and two of S. turgaicum) the metacarpal facet faces more dorsally and occupies nearly half the dorsal surface, as in C. nisingense. In M or opus and Phyllotillon a similar dorsal orientation of the facet distinguishes the basal phalanx of digit II of the manus, and this may well have been true also of Schizotherium. Middle Phalanges. (Text-fig. 18 ; Table IX.) There are 28 middle phalanges in the collection. They vary in size : the larger ones probably belong to the manus and the smaller ones to the pes. The small. Fig. 18. Middle phalanges. Left, Chalicotherium rusingense, R , in lateral, dorsal and proximal views. Centre, C. rusingense, from site Rs 38. Right, Schizotherium priscum, Paris Museum. All x Please note that these images are extracted from scanned page images that may have been digi
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