214 RODENTIA. 



<&vttom$& marmotta (Linn. 1 ). 



Syn. Mus marmotta, Linn. 2 



Arctomys primigenius, Kaup 3 . 



Myoxus primigenius, Kaup. 

 Hob. Europe. 



There appear to be no sufficient grounds for separating Arctomys 

 primigenius from the slightly smaller existing European form. 



27624 a. The cranium and two portions of the mandible ; from the 

 Pleistocene of Champeix, near Issoire (Puy-de-D6me), 

 France. Croizet Collection. Purchased, 1848. 



Family CASTORID^E. 



Dentition : I. \, C. ?, Pm. \, M. |. 



Genus CASTOR, Linn. 4 



Cantor fifoer, Linn. 6 



Syn. Castor fossilis, Goldfuss 6 . 

 Castor europesus, Owen 7 . 



Hob. Europe. 



39889. A nearly complete skeleton ; from Watcham Fen, near Ely. 

 Cambridgeshire. Purchased, 1866. 



39889 a. The cranium and mandible; from Isleham Fen, near 

 Cambridge. Presented by Barrett, Esq. 



41368. The cranium and mandible ; from the turbary of the Lea 

 valley, near Walthamstow, Essex. Purchased, 1869. 



42922. The cranium, wanting the zygomatic arches, the incisors, 

 and some of the cheek-teeth ; from the turbary of Ghent, 

 Belgium. Van Breda Collection. Purchased, 1871. 



46133. Cranium, wanting the malar bones ; dredged off the Dogger 

 Bank. Owles Collection. ' Purchased, 1874. 



37199. Cranium, wanting the right zygomatic arch; from Ditton 

 Fen, Cambridgeshire. Purchased, 1863. 



1 Syst. Nat. ed 12, vol. i. p. 81 (1766). 2 Loc. cit. 



3 In Meyer's ' Palteologia,' p. 61 (1832). 



4 Syst. Nat. ed. 12, vol. i. p. 78 (1766). Loc. cit. 

 G Nova Acta Ac. Cffis. Leop.-Car. vol. xi. pt. 2, p. 488 (1823). 



7 'British Fossil Mammals and Birds,' p. 190 (1846). 



