106—2 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
Family II.: SPALACIDJE. 
Genus: RHIZOMYS, Gray. 
Distribution and number of species . — According to Dr. G. E. Dobson,' the 
genus 
occurs in China, Tibet, tlie Malay Peninsula, and Eastern Africa;, and Dr. J. 
Anderson^ gives the following list of species from India, China, etc., viz. : 
Rhizomys badius, Hodg-son. India and Burma. 
,, ERYTHROGENYs, Anderson. Burma and Tenasserim. 
,, MINOR, Gray. Burma, Rlartaban, etc. 
,, PRUINOSUS, Blyth. Eastern Asia. 
,, SINENSIS, Gray. China. ' 
,, suMATRENSis (Raffles). Sumatra. 
The form described below is the only known fossil species. 
Species : Rhizomys sivalensis, nobis. 
Syn (?) T/jphlodon^ Falconer. 
Ilistorp. — This species was briefly described by the jiresent writeF in 1878 
on the evidence of two rami of the mandible, one of which was subsequently 
figured.'' It was suggested that the generic name Tpphlodon., Falconer,'' might 
probably have been assigned to the present form ; its derivation from the allied 
Spalax Ujpldus being so obvious. This suggestion is confirmed by the fact that 
Siwalik specimens of the present form are preserved in the British Museum. 
Alandible . — In the accompanying woodcut (fig. 1) there is given an enlarged view 
of the dental aspect of the left ramus of a mandible, collected by Mr. Theobald in 
the Siwaliks of the Punjab. Only the two last 
molars remain, the crown of iuTl having been 
broken off. A portion of the incisor still remains 
on the lower border ; and the two molars are in an 
early stage of wear. In woodcut fig. 2, there are 
represented two portions of the right ramus of the 
mandible of a species of the same genus. The 
first specimen (a) is vieAved from the inner aspect, 
and shows the second and third molars, the crown 
of m. i having been broken off. The second (c) is 
vioAved obliquely from the outer a,nd iq3per aspects, 
and shoAvs the three molars in a Avell-Avorn con- 
dition. Both Avere obtained by ]\Ir. Theobald from 
the Shvaliks of the Punjab. The molars of these 
two specimens are rather smaller than those of the 
specimen represented in fig. 1 , and the depth of the 
1 “ Encyclopsedia Britannica,” 9th ed.. Art “ Mammalia,” p. 419. 
2 ‘ ‘ Anatomical and Zoological Results of the two Exj)editions to 
Yunnan, p. 322 (1878). 
3 ‘Records,’ vol. XI., p 100. 
4 Ibid.., vol, XII., p. 52. 
5 “ Paleontological Memoirs,” vol. I., p. 23, 
ml. m2, m3. 
Eig. 1 . l{hizom>/t sion/eihyin. Part of 
the loft ramus of the mandihle, from the 
Siwaliks of the Punjab. Indian Aluseum 
(No. D. 97). f. 
Fig. 2. Rlnzomya, sp. Two specimens 
of part of the right ramus of the mandihle, 
from the Siwaliks of the Punjab. Indian 
Museum (Nos. D 97a, 97b.) |. 
