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Show 92 MR. E. R. ALSTON ON THE ORDER GLIRES. [Jan. 18, nal and internal enamel-folds ; the lower with one external and two internal folds, dividing them into narrow angular lobes. C. ECHINOMYIN^E. Grinding-teeth semirooted or rooted, with deep, curved enamel-folds. Fur more or less harsh, often mixed with spines. Tail usually long. Neotropical and Ethiopian. Recent genera:- 9. Carterodon, Waterhouse, Nat. Hist. Mamm. ii. p. 351 (1848). Muzzle blunt; ears moderate; tail short, clad with scales and rather long hairs. Skull broad, with no marked crests ; frontals with delicate supraorbital ridges. Incisors broad, with longitudinal furrows and raised ridges. Upper grinding-teeth with one internal and two external enamel-folds ; the lower similar but reversed. 10. Myopotamus, Geoffroy, Ann. du Mus. vi. p. 81 . . . (1805). Muzzle blunt; pollex with a truncated nail ; hind feet large, with the first four digits fully webbed and the fifth free; tail moderate, cylindrical, scaly. Skull elongated, with sharp occipital and sagittal crests; auditory bullae small; paroccipital processes very long. Incisors flat, plain. Grinding-teeth as in Carterodon, but the lower with three internal folds. 11. Cercomys, F. Cuvier & Geoffroy, Mammiferes, 6melivr. (1829). Muzzle pointed ; ears rather large ; fur without bristles or spines ; pollex very small, with a short nail; hind feet not webbed ; tail long, scaly. Skull ovate; frontals contracted, with sharp supraorbital ridges, coronoid process small. Incisors flat. Grinding-teeth with nearly circular crowns; the upper with one internal and three external enamel-folds ; the lower similar but reversed. 12. Loncheres, Illiger, Prod. Syst. Mamm. p. 90 ... . (1811). Muzzle blunt; ears rather short; fur in most species mixed with flattened lanceolate spine ; toes subequal; second digit of fore feet with a broad truncated nail; tail long, clad with scales and hairs. Skull like that of Cercomys. Incisors narrow. Upper grinding-teeth like those of Cercomys, but longer, with the middle folds usually meeting in the middle; the lower with one external and two internal folds. 13. Mesomys, Wagner, Wiegm. Arch. 1845, Th. ii. p. 145 (1845). External characters as in Loncheres ; but pollex with a short curved claw, fur without spines, and tail short, thickly haired. No distinct supraorbital ridges. Incisors broad. Upper grinding-teeth with one or two external folds ; the lower similar but reversed. 14. Echinomys (=Echimys), Desmarest, Nouv. Diet. d'Hist. Nat. X * P * 4 5 (1817). Muzzle pointed ; ears larger than in Loncheres ; feet narrower, the toes more uneven in length, fur usually mixed with spines. Palate shorter and broader. Incisors narrow. Grindii.g-teeth as in Mesomys. |
