18/6.] mr. e. r. alston on the order glires. g3 



Glires. 



I. Rongeurs ordinaires . 6. Lagostomidee. 



1. Sciuridse. 7. Hystricidse. 



2. Pseudostoniidse *. 8. Caviadae. 



3. Mnridse. 



4. Dipodidse. II. Rongeurs duplicidentes. 



5. Cteaomydee. 9. Leporidae. 



In 1855 appeared Professor J. F. Brandt's learned and elaborate 

 review of the cranial structure and classification of recent Rodentst- 

 On the whole he adopted Mr. Waterhouse's arrangement; but recog- 

 nizing the fact that his four groups were of more than familj^ value, 

 he raised them to the rank of suborders. He also made several 

 changes in the arrangement of the families and the position of some 

 of the more doubtful forms, and imposed new names on all the 

 divisions, which he arranged in the following order : — 



Glires. 



I. Sciuromorphi. III. Hystricomorphi. 



1. Sciuroides. 8. Hystricoides. 



II. Myomorphi. 9. Spalacopodoides§. 



2. Myoxoi'des. 10. Eriomyoides||. 



3. CastoroVdes. 11. Hemionychoi'des^. 



4. Sciurospalacoidesi. IV. Lagomorphi. 



5. Myoi'des. 12. Lagoi'des. 



6. Spalacoides. 



7. Dipodoides. 



Eleven years later Professor Lilljeborg published his admirable sys- 

 tematic review of this order**. Appreciating the great importance of 

 the characters which separate the LeporidcB and Lagomyidce from 

 all other rodents, he adopted Gervais's two suborders under the 

 names Glires Simplieidentati and Glires Duplicideiitati. In the 

 arrangement of the former he pointed out a well-marked and con- 

 stant character which separates the Myomorphi of Brandt from both 

 the Sciuromorphi and the Hystricomorphi, namely the complete 

 ankylosis in the former of the lower part of the tibia and fibula. 

 Although Professor Lilljeborg does not retain these divisions in his 

 tabular arrangements, he observes that the Myomorphi include the 



* Saccomyina, Waterhouse. 



t J. F. Brandt, " Unteisuchungen iiber die craniologischen Entwieklungs- 

 stufen . . . und Classification der Nager der Jetzwelt," Mem. de I'Acad. Imp. 

 de St. P^tersbourg, 6""« s6rie (Sciences Naturelles), vii. pp. 127-336, 12 pis. 

 (1855). 



X Containing Geomys and Thomomys. 



§ Equal to Echimyina and Octodontina of Waterhouse. 



11 ChinchilUna, Waterh. 



^ Equal to Dasyprootina and Caviina, Waterh. 



** SystematiskCEfversigtaf de GnagandeDaggdjuren, Glires. 4to. Upsala, 

 1866. 



