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Show I I : • 1878.] MR. A. H. GARROD ON TOLYPEUTES TRICINCTUS. 225 T. t'ri- cinct'lts. tJ'Tin. cttruis-. cTin. dttrtis-. T. r~ctosn . tt- T. r~ctos.m t- T. rlctos.n u- T. r1ctoS.n u- T. 7nuriei. ._ ------ ---------- ---------- ~ength of cephalic in. In. in. in. in. m. In. In. shield "" .... " .. 3 2'9 2'9 2'75 2'75 2'75 3 3'1 ~ength of ante-rior shield ..... 3'2 3'3 3'4 2'75 2'55 2'65 3'1 2-8 length of poste-rior shield ...... 5'8 5·75 5'7 5'5 5'75 5'8 6'75 6'3 length of tail (upper aspect). ? 2'25 2'25 2'2 2'2 2'2 2'5 ? - - ---- - --- - - - --- ---- B.M.49, B.M. B.M. B.M. B.M. 52, B.M.46, B.M. B.M. 3, 12, 1. no. 140 b. no. 140 c. no. 140h. 8,24, 10. 9,28,35. e. no.l40a. It should also be mentioned that in T. tricinctus there is much more hair on the carapace at the posterior margins of the scntes than in the two other species, and that it has only eight teeth on each side o~ each jaw, whilst both in T. COnUl"US and in T. mUl'iei there are mne. All the specimens of the genus 1'olypeutes agree, as far as my experience goes, in the manner in which their cervical vertebrre ankylose- the atlas, together with vertebrre 5, 6, and 7 alone being free. Concerning the geographical distribution of t.he genus Tolypeutes, the localities whence both Dr. Murie's and my specimen were obtained cannot be determined, they having been both purchased of dealers. The specimen 140 a in the British Museum, of T. mW'iei, was prestnted by Burnett and Fitzroy, and therefore must have probably come from some part of the coast of La Plata or Patagonia. A national specimen of T. conurus is marked as having come from Bolivia. Auother of the same species, in the museum of the Royal College of Surgeons, was presented by Mr. Darwin. The type specimen of T. conurus was obtained in the province of Santa Cruz de la Sierra, Bolivia; and for a cast of its cephalic shield, from which I have been able to determine the correctness of the nomenclature above adopted, I have to express my very hest thanks to Professor Alphonse Milne-Edwards. The species described by Burmeister) from Buenos Ayres is T. conurus. Azara found a four-toed species in Paraguay; it was therefore not T. tricinctus. The brain of no species of Tolypeutes has been descrihed, Dr. Murie having met with an accident with his specimen. By Gervais a cast is figured of the interior of the skull, which demonstrates the 1 An ales del Museo Publico de Buenos Ayres 1.'\71 tom, ii. p. 117. PROC. ZOOL. Soc.-ISiS, No. XV. 15 T. ?n1t?'iei. --- in. ? 2'65 6'3 ? ---- Dr. MLl-rie's specimen. |