The Quarterly journal of the Geological Society of London . he threeIndian species of {\\z, , T. Leithi, and T. Imriim)differ from all other members of the family in having two neuralbones between the first pair of costals t, this being apparently dueto a subdivision of the normal first costal. All the fossil specieshitherto described, of which the entire carapace is known, agree * See Quart. Journ. Geol. See. vol. xlii. p. 20 (1886). t See Boulenger/Catc-Jogue of Chelonians, &c. in Brit. Mus. p. 244 (1889). 38 MR. K. LYDEKKEK ON A NEW SPECIES OF TEIONYX. with the iiormai
The Quarterly journal of the Geological Society of London . he threeIndian species of {\\z, , T. Leithi, and T. Imriim)differ from all other members of the family in having two neuralbones between the first pair of costals t, this being apparently dueto a subdivision of the normal first costal. All the fossil specieshitherto described, of which the entire carapace is known, agree * See Quart. Journ. Geol. See. vol. xlii. p. 20 (1886). t See Boulenger/Catc-Jogue of Chelonians, &c. in Brit. Mus. p. 244 (1889). 38 MR. K. LYDEKKEK ON A NEW SPECIES OF TEIONYX. with the iiormai type in having but a single long neural betweenthe first pair of costals ; and no species, so far as I am aware, hasbeen named from the Maltese Miocene. An inspection of the figureof the Maltese specimen will, however, at once show that it agreeswith the T. f/cmgeticus group in having two neurals (n and n^) Pig. 1.— Upper surf ace of the anterior part of the carapace of ; from the Miocene of Malta. (One fourth of thenatural size.). between the first costals, and that it is therefore specifically distinctfrom all fossil species based on specimens sufficiently perfect toexhibit the characteristic features of this part of the T. gangeticus and its allies it is distinguished by the greaterelongation of the second moiety of the divided neural (n*), in con-sequence of which the proper second neural {ir) becomes muchshorter, and also by the coarser sculpture. In its coarse sculptureit agrees Avith T. planus., of the Hordwell beds, in which the anteriorpart of the carapace is unknown, but is of larger dimensions. It has already been mentioned that in its large size and coarsesculpture the fossil approximates to Chitra inclica ; and the questionnaturally arises whether extinct species of Chitra may not, like theIndian species of Trionya\ have the first neural divided. In theabsence of the skull it is almost or quite impossible to say whether :VIR. R. L
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