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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![known genus will therefore legitimately give name to the family Geomyida, the subfamilies standing as Geomyincp. and Ileteromyince. Here I am inclined to place, at least provisionally, a family of Rodents which flourished in Europe in the later Eocene and Miocene periods, and of which three genera are known. Each of these was at first ascribed to a distinct family of the Hystricomorpha—namely, Theridomys to the Octodontidce, Archceomys to the Chinchillidce, and Issiodoromys to the Caviidce. M. Gervais was the first to re- move them entirely from that section, uniting the first two in his tribe Theridomins of the family Myoxides (which also included Anomalurus). He placed Issiodoromys in his tribu des Pedetins of the Bipodidre, but with the remark that it might have to be rele- gated to the Theridomins*. That these animals were strictly myo- morphine is clearly shown by the form of their mandibles. Now that Anomalurus has been definitely separated from the Myoxidce, there seems to be nothing to unite these ancient rodents with that Fig. 4. Mandible of Capromys pilorides. family ; and, both in their very varied dentition and in what we know of their cranial characters, they appear to me to be very nearly related to the Bipodidce—the two former to the true Bipodince, and the last to the Pedetince. Meantime it may be best to allow them to stand as a distinct family under the name of Theridomyidce. The last family of the Myomorpha, the Bipodidce, is divisible into three plainly marked subfamilies—Jaculince, Bipodince, and * Zool. et Paltont. Franc;. (2m« ed.), pp. 31-36. [10]](https://iiif.wellcomecollection.org/image/b22455334_0014.jp2/full/800%2C/0/default.jpg)
