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Show 1885.] DR. ST. G. MIVART ON THE ARCTOIDEA. 387 Aonyx1.-This small genus of the species from Nepal, Java, Sumatra, and South Africa, differs from Lutra in its rudimentary or even obsolete claws, and in having the feet only slightly webbed. The palmar and plantar surfaces are quite naked, or at most have but a few scattered hairs. There are 14 dorsal, 6 lumbar, 3 sacral, and 20 caudal vertebrae. The ultimate phalanges of the manus and pes are much shorter relatively than in any other Arctoid. The breadth of the brain-case, compared with the length of the skull, is at its maximum amongst Arctoids, as is the length of the first lower true molar. Caudal vertebrae with hypapophyses depending from the hinder end of the centrum of the first and of the second vertebrae and from the front end of the centrum of the third vertebra and of the succeeding vertebrae to the tenth. Three real chevron bones are placed beneath the intervals of the vertebrae, between the third and the sixth. The humerus has a condyloid canal. The radius develops no process from the ulna. The acromion is very slender. No special ectotrochanteric ridge to femur. Ultimate phalanges exceedingly minute ; those of pes slightly lower than those of manus. The skull resembles that of Lutra, save that it is less flattened, especially the bullae. The cranial ridges are generally smaller, as are the mastoid and paroccipital processes. The pterygoids tend less to depend. There are no defects of ossification in the exocci-pitals. Molar formula = P. ^ M. \. The true molars are more massive than in Lutra. The first upper molar is large relatively and more preponderating over the fourth premolar. Enhydra2.-This very peculiar genus, containing only a single 1 Lesson, Mamm. p. 157; Fischer, Synop. p. 228; P. Gervais, Mamm. ii. p. 118 ; Gray, P. Z. S. 1865, p. 129; id. Cat. Carniv. B. Mus. p. 109; Horsfield, Zool. Research, vii.; Raffles, Linn. Trans, xiii. p. 254; De Blainville, Osteogr. Mustela. 2 Mustela lutris, Linn. Syst. Nat. i. (1758) p. 45, no. 1; Schreber, Saug. iii. (1777) p. 128; Gmelin, Syst. Nat. i. (1788) no. 1. Mustela, De Blainville, Osteographie. Phoca lutris, Pallas, Zoog. Rosso-As. i. (1831) p. 100, no. 34. Lutra lutris, Gray, P. Z. S. 1865, p. 136, pi. vii. and Cat. Carniv. B. Mus. p. 118. Lutra marina, Steller, Nov. Ann. Petrop. ii. (1751) p. 367, tab. xvi.; Erxle-ben, Syst. Nat. (1777) p. 445 ; Schreber, Saug. iii. (1778) p. 465, pi. cxxviii.; Desm. M a m m . i. (1820) p. 189; Harlan, Faun. Amer. (1825) p. 72. Lutra stelleri, Lesson, M a m m . (1827) p. 156, no. 423. Enhydra marina, Fleming, Philos. Zool. ii. p. 187 ; Martin, P. Z. S. (1836) p. 59; Aud. & Bachman, N. A. Quad. iii. p. 170, pi. cxxxvii.; Baird, M . North Am. (1857) p. 189. Enhydris marina, Licht. Darstell. Saug. (1827) p. 34, pis. 49 and 50; Wagner's Supp. ii. p. 268; P. Gervais, M a m m . ii. p. 119. Enhydris stelleri, Fischer, Syn. (1829) p. 229. Enhydris lutris, Coues, Fur-bear. Anim. p. 326. Lutra (Enhydra) marina, Richardson, F. B. A m. i. (1829) p. 59, no. 21; id. Zool. Beechey's V. (1839) p. 5. |