On the classification of the order Glires / by Edward R. Alston.
- Edward Richard Alston
- Date:
- 1876
Licence: Public Domain Mark
Credit: On the classification of the order Glires / by Edward R. Alston. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![foramina large. Incisors plain. Molars never tuberculate, the in- denting folds deep and closed, those of the second and third lower molars sigmoid. 30. Neotoma, Say & Ord, Journ. Acad. Philad. iv. p. 34G (1825). Ears large, nearly naked ; tail long, either sparsely haired or bushy. Upper incisors broad, plain. Molars never tuberculate, with open angular indenting folds, giving them a very arvicoline appear- ance. (/3. Molars semirooted or rootless.) I. ArvicoliN/E. Molars composed of triangular prisms placed alternately. Skull with brain-case rhomboidal, frontals much con- tracted, infraorbital opening typical. Limbs moderate; tail mode- rate or short, hairy. Palaearctic and Nearctic. Recent genera:— 31. Fiber, G. Cuvier, Legons d’Anatomie (1800). Form thickset; muzzle blunt; limbs short, subequal; hind feet fringed with long stiff hairs ; tail moderate, compressed, clad with scales and short hairs; supraorbital ridges united in a sagittal crest. Palate and lower surface of maxillaries minutely perforated. Incisors plain. Molars semirooted, separated into prisms, which are placed alternately. 32. Arvicola, Lacepede, Tableau (1803). Muzzle blunt; fore feet small, with short claws, soles naked ; tail longer than the hind foot, clad with short hairs. Skull as in Fiber; but the supraorbital ridges diverge after meeting, and converge again on the interparietal; palate not perforated. Incisors plain. Molars as in Fiber, rootless (rarely semirooted). 33. My odes, Pallas, Zoogr. Rosso-Asiat. i. p. 1/3 ... (1811). Muzzle blunt; fore feet moderate, with strong hooked claws; soles hairy ; tail not longer than hind foot, hairy. Skull as in Arvicola, but the brain-case broader and the zygomatic arches stronger. Molars rootless, as in Arvicola, but the prisms of the posterior teeth usually compressed and twisted. K. Siphnein^j. Molars as in the Arvicolince; infraorbital open- ing small and subtriangular. Form cylindrical; ear-conch rudimen- tary ; limbs and tail very short. Palaearctic. Recent genera :— 34. Ellobius, Fischer, Zoognosia, iii. p. 72 (1814). Body subcylindrical; limbs very short, upper lip cleft; eyes small ; no external ear-conch ; fore feet with short claws, but stronger than the hind feet; tail very short. Skull as in Arvicola, but the profile more arched and the facial portion shorter. Upper incisors arched forward. 35. Siphneus, Brants, Ilet Geslact der Muizen, p. 20 . . (1827). Eyes small; ears rudimentary ; fore feet with long, strong claws, [25]](https://iiif.wellcomecollection.org/image/b22455334_0029.jp2/full/800%2C/0/default.jpg)
