214 RODENTIA. 

VM : Arctomps marmotta (Linn.*). 
Wa _ Syn. Mus marmotta, Linn? 
Arctomys prumigenius, Kaup 3. 
Myoxus primigenus, Kaup. 
Hab. Europe. 
There appear to be no sufficient grounds for separating Arctomys 
primgenius 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-Dome), 
France. Croizet Collection. Purchased, 1848. 
Family CASTORID A. 
ah ty a0 1 3 
Dentition :—I. ;, C. 5, Pm. ;, M. 5. 
Genus CASTOR, Linn.’ 
Castor fiber, Linn.’ 
Syn. Castor fossilis, Goldfuss °. 
Castor ewropeus, Owen’. 
Hab. Kurope. 
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 Loe, cit. 
3 In Meyer's ‘ Paleeologia,’ p. 61 (1832). 
4 Syst. Nat. ed. 12, vol. i. p. 78 (1766). 5 Loe. cit. 
® Nova Acta Ac. Oss, Leop.-Oar. vol. xi. pt. 2, p. 488 (1823). 
rf 
‘British Fossil Mammals and Birds,’ p. 190 (1846). 
