CASTOKIRE. 217 



16449. The right ramus of the mandible ; from the Forest-bed of 



(Fig.) Bacton, Norfolk. This specimen (which may be regarded 



as the type of Pomel's Diobroticus schmerlingi) is figured 



by Owen in the ' British Fos"sil Mammals and Birds,' 



fig. 71, p. 184. Green Collection. Purchased, 1843. 



40978. Part of the left ramus of the mandible, containing the pre- 

 (Fig.) molar and the first and second true molars ; from the 



Forest-bed of Cromer, Norfolk. This specimen is figured 

 by Owen, op. cit. figs. 72-3, pp. 186, 189. 



Presented by Sir 0. Lyell, Bart., 1868. 



16119. Greater portion of an incisor ; from the Forest-bed of Bacton. 

 Green Collection. Purchased, 1843. 



M. 1570. Casts of an incisor and parts of the mandible. The 

 originals are from the Forest-bed of Mundesley, Norfolk. 



No history. 



40979. Distal extremity of the femur ; from the Norwich Crag of 



Thorpe, Norfolk. This specimen is the one mentioned by 

 Owen in the ' British Fossil Mammals and Birds,' p. 191, 

 where it is referred to Castor fiber (europceus). 



Presented by Sir C. Lyell, Bart., 1868. 



40979 a. Casts of the femur, tibia, and calcaneum. The originals 

 are from the Forest-bed of Mundesley, Norfolk, and are 

 figured by Owen in the Geol. Mag. vol. vi. pi. iii. (1869). 

 The originals were in the collection of the Eev. S. W. King. 



No history. 



Genus CHALICOMYS, Kaup 1 . 



Syn. Steneofiber, Geoffrey 2 . 



Steneotherium, Geoffrey 3 . 

 Chloromys, H. v. Meyer 4 . 



The writer follows Schlosser, " Die Nager des europaischen Ter- 

 tiars " ' Palffiontographica, vol. xxxi., p. 21 (1884), in uniting 

 Chalicomys and Steneojtber. The former name, having the priority, 

 is adopted for thfe genus. The genus is distinguished from Castor 

 by the presence of an entepicondylar foramen to the humerus. The 

 molars are more distinctly rooted and have squarer crowns, with 



i Isis, 1832, p. 994. 



* K*vtie Encyclopedique, vol. lix. p. 95 (1833). Loc. cit. 



* Neues Jahrb. 1843, p. 390. 



