234 KODENIIA. 



India. This and the next specimen are slightly larger 

 than the type specimen (woodcut, fig. 31) ; but as they are 

 otherwise precisely similar, they have been provisionally 

 referred by the present writer, in the ' Palaeontologia In- 

 dica,' ser. 10, vol. iii. p. 107, to the same species. The 

 length of the space occupied by the three molars is 0,019. 

 Cautley Collection. Presented, 1842. 



Fig. 31. 



m.\. in. 2. m. 3. 



Ehlzomys sivalensis. Part of the left ramus of the mandible ; from the Siwaliks 

 of the Punjab. Indian Museum, Calcutta. |. (From the ' Palseontologia 

 Indica.') 



15926. Part of the right ramus of the mandible, containing the 



second molar and the broken bases of the teeth on either 

 side ; from the Pliocene of the Siwalik Hills. 



Cautley Collection. Presented, 1842. 



15927. Fragment of the left ramus of the mandible, containing the 



first and second molars, in a more worn condition than in 

 either of the preceding specimens ; from the Pliocene of 

 the Siwalik Hills. Cautley Collection. Presented, 1842. 



15927 a. Two molar teeth ; from the Pliocene of the Siwalik Hills. 

 Cautley Collection. Presented, 1842. 



Section HYSTEICOMOEPHA. 

 Family THERIDOMYID^. 



This family was established by Alston 1 for the reception of the 

 genera Theridomys, Arcliceomys, and Issiodoromys. Schlosser 2 con- 

 siders that the first two genera, together with Protechinomys and 

 TrecJiomys, are most nearly allied to the existing Octodontidce (Lon- 

 cheres and Echinomys) ; while he refers 3 Issiodoromys and the allied 

 Nesocerodon to the Caviidce (Dolichotis). This arrangement has been 

 adopted here. 



Dentition: 1. _J, C. J, Pm. \, M. ?. 



1 Proc. Zool. Soc. 1876, p. 88. 



2 Palaeontographica, vol. xxxi. p. 33 (1884). 3 md p 15 



