MAMMALS KROM SIAM. 



59 



parietal suture is less curved and the incisors rare paler, being 

 ivory-white with white tips, though they project iii the notable 

 manner of the type oi Mtos berdmovei\ while the molars are of 

 similar small size, and the rostrum is likewise elongated, with a 

 sti-aight or only slightly curved upper profile. No information 

 is available as to the bullfe of the latter, but those of E. h. magnus 

 are perhaps larger than are to be fonnd in any eastern rat of equal 

 size, being extremely dilated and kidney-shaped. Thomas, in the 

 account of the skulls seen by him (see below), does not mention 

 this very notable feature. 



Measurements. — I give, in the form of a comparative table, the 

 measurements of the present animal, of the type of Mus herdmorei, 

 and such others as have been published of animals which have 

 been allocated to the species*. 



Collector s External Measurements, in millimetres. 



Skull Measurements. 



Si am, Type. 



Greatest length 



Coiidylo-basilar lenj^'tli 



Basal length 



Palatal length 



Palatal foramina 



Diastema 



Upper molar series 



Length of nasals 



Anterior breadth of nasals 



Interorbital breadth 



Zygomatic breadth 



Cranial breadth 



I nterparietal breadth 



„ length 



Extreme breadth between outer edges 



of infraorbital foramina 



Zygomatic plate ' 



Extreme breadth between auditory 



meati I 



Breadth of basioccipital at suture 



47 

 43-2 

 42-2 

 94-6 

 9-2 

 10-1 



7-0 



19-2 



4-8 



7-1 



24-0 



17-0 



14-7 



8-1 



12-1 

 4-8 



18-8 

 3-5 



32'2 



8-1 



14-0 



G-Q 



16-0 



4--2 



6-0 



21-5 



16-5 



13-7 



11-0 

 5-0 



Thagata, 



3e--4 



21^4 

 71 



12-9 



6-0 



14-0 



21-8 



10-3 



4'0 



10-4 

 ■ 4-0 



Man i pur. 



22-4 

 7-8 



II- 1 

 0-1 



16-0 



7-0 

 21-5 



4-7 



* Thomas, p. Z. S. 1886, p. 62, two unsexed specimens from Manipur; id., A)in, 

 Mus. Civ. Genova, ser, 2 a, vol, x. (xxx.), 1892; two females from Thagata, Teuas- 

 scrim and Bhanio, J5urnia. 



