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Show 240 MR. OLDFIELD THOMAS ON THE MAMMALS [Nov. 3, unexpected, as also is the close resemblance it bears to the N. spinosus of Peru, from which it differs chiefly by its brighter, clearer colour. 22. PROECHIMYS LONGICAUDATUS Rengg. rf. 1011, 1024, 1027, 1034, 1046, 1047, 1114, 1190, 1197, 1201, 1204. $. 1009, 1021, 1035, 1078, 1113, 1185, 1187, 1194. Rengger's type was obtained on the 21st parallel of latitude, therefore not far south of Corumba. It would be interesting to get absolute topotypes of it, but the Chapada series no doubt belongs to the same species. It is nearly allied to my P. boli-vianus, which differs from it by the cranial characteristics given in the description of the latter. 23. COENDOU BRANDTI Jent. 6. 1075, 1167, 1183. These specimens may be considered to represent typically Dr. Jentink's species, for Brandt's figures, on which the name was founded, were from specimens in the Langsdorff collection, and as Sciurus langsdorff, came from Matto Grosso, the Porcupine may very likely have done so as well. The skull exactly agrees with these original figures. C. brandti is certainly very closely allied to Gray's C. boliviensis, but the skull differs in certain details, as to the constancy or otherwise of which no opinion can be expressed, until a much larger series has been examined. O 24. COENDOU CENTRALIS, Sp. n. S 1147. 22 September, 1902. Type. (B.M. No. 3.7.7.102.) A member of the group for which Dr. Jentink has used the name of prehensilis. The skull less swollen than in C. brandti. Size about the same as in C. brandti; relative development of spines and hair as in that species. General colour rather darker, owing to the greater extension of the black on the spines, but there is no very material difference in this respect. Belly browner. Tail decidedly darker, especially along the middle line below. Skull of the same less swollen type as is figured by Cuvier * and considered by Jentink to be prehensilis. Nasals comparatively long and narrow, parallel-sided. Palatal foramina very small as compared with those of a Rio Jordao (Sao Paulo) specimen of C. prehensilis. Teeth smaller than those of C. brandti. Dimensions of the type, measured in the flesh :- Head and body 480 mm.; tail 530 ; hind foot (s. u.) 80, (c. u.) 90, from back of hallucal climbing pad (s. u.) 66. Skull-greatest length 94 m m . ; basilar length 82 ; greatest breadth 53; nasals 32 x 25; least interorbital breadth 35; greatest * Mem. Mus. ix. pi. 20. fig. 3 (1822). |