190 CARNIVORA. 



20 b (0. C.) The right ramus of the mandible, containing the car- 

 nassial ; from a cavern in Sundwig, Westphalia. 



Sommering Collection. Purchased, 1827. 



16711. The left ramus of the mandible, containing all the teeth except 

 (Fig.) the incisors, pmTI, and pmT3 ; from Kent's-Hole Cavern, 

 Torquay. This specimen is figured by Owen in the 

 ' British Fossil Mammals and Birds,' p. 107, fig. 37. The 

 teeth are in an unworn condition, and the alveolus of 

 plnTl is of minute size. 



McEnery Collection. Purchased, 1842. 



M. 1884. The cranium and mandible ; from a brick-field at Grove- 

 hurst, Sittingbourne, Kent. The age of this specimen is 

 doubtful. Presented by George Payne, Esq., 1884. 



27659. The distal half of the left humerus (showing the entepi- 

 condylar foramen) and the proximal half of the left ulna ; 

 from a cavern at Montpellier, France. 



Croizet Collection. Purchased, 1848. 



Genus LUTRA, Erxleben 1 (ex Ray). 

 Including : Aonyx, Lesson. 



Enkydriodon (Amyxodori), Falconer 2 . 

 Lutrictis, Pomel 3 . 

 Potamotkerium, E. Geoffroy 4 . 

 Stephanodon, H. von Meyer 5 . 



Dentition. In the typical living forms the dental formula is 

 I. |, C. j, Pm. |, M. |; but in L. (A.) leptonyx the first upper pre- 

 molar is not unfrequently absent ; and in some fossil forms this 

 tooth is invariably wanting. In another fossil species m. 2 is 

 present ; so that the dental formula for all these variations must be 

 written as follows, viz. 1. 1, C. \, Pm. (3 ~ 4) , M. ^f. The reasons 

 for including EnJiydriodon in the present genus are given by the 

 writer in the ' Palasontologia Indica,' ser 10, vol. ii. pp. 195-201. 



1 Syst. Eegn. Animal, p. 445 (1777). 



2 In 'Falconer's Pakeontological Memoirs,' vol. i. p. 331 (1868). The name 

 Amyxodon dates from 1836, but was never defined. 



3 Bull. Soc. Geol. France, ser. 2, vol. iv. p. 380 (1846). 



4 Revue Encyclopedique, vol. lix. p. 88 (1833). 



8 Neues Jahrbuch, 1847, p. 182 ; and Suppl. Arch. Sci. Phys. Nat. vol. v. 

 p. 307 (1847). 



