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Show 23 PROCAVIA BETTONI, sp. n. Allied to P. stuhlmanni Matsch., but darker coloured, the general colour above drab-brown, washed with a warmer tone along the back. Skull markedly smaller than in P. stuhlmanni. Dimensions of the typical skull, in Stage V.:-Greatest length 81 mm.; basal length 75'5; combined lengths of four premolars and two anterior molars 26 • 7. Ilctb. Rogoro, Kikuyu. Type. Male. B.M. No. 0.1.3.5. Mr. F. E. BEDDARD, F.R.S., read a second of a series of papers entitled " Contributions to the Anatomy of the Lacertilia," based on observations he had made in the Society's Prosectorium. The present pari dealt with some points in the structure of the Teguexin (Tujrinambis). Mr. G. A. BOULENGER, F.R.S., gave an account of the Triassic Reptile Telerpeton elginense, based on new material recently procured at Loosiemouth by Mr. William Taylor. A study of the new specimens, and a re-examination of those previously described, showed Telerpeton to be related to Procolophon and Diadectes, and therefore to be referable to the Order Cotylosauria of Cope, which the author proposed to keep distinct from the Pariosauria and Anomodontia. Remarks were added on the classification of the Reptilia in two diphyletic series-Theromora and Herpetomorpha ; the former including the Pariosauria, Cotylosauria, and Anomodontia, the latter all other orders. A communication from Mr. HERBERT DRUCE, V.P.Z.S., contained descriptions of twenty-three new species of Butterflies, belonging to the family Erycinidcn, from Tropical South America. Dr. A. SMITH WOODWARD, F.R.S., communicated a paper by Dr. ROBERT BROOM, C.M.Z.S., on the Theriodont mandible and its mode of articulation with the skull. It contained an account of the structure of the mandible in Cynognathus, Gomphognathus, and Trirachodon, and the author showed that the jaw was formed mainly by the dentary bone, while the articulation was formed entirely by the articular. A distinct splenial, angular, and surangular were recognised. The quadrate was a flat bone lying in front of the lower part of the squamosal and also covering its lower edge. Lying directly inwards from the quadrate was a bone which was believed to be the tympanic. Dr. Broom believed that the mammalian jaw was derived from that of the Theriodont by the dentary forming the articulation and the articular becoming degenerate and the small membrane-bones lost. The malleus was believed to be the hyomandibular, and that part of Meckel's cartilage in the neighbourhood of the |