422 ^Jv. O. Thomas on 



six skulls, yellovvisli in the other two ; in lockwoodi all are 

 strong yellow. Molars not appreciably different. 



Dimensions of the t) pe : — 



Head and body 390 mm.; tail 376; hind foot 109; 

 ear 82. 



Skull : greatest length 96 ; condylo-incisive length 89 ; 

 zygomatic breadth 46 ; nasals 35 X 12-5 ; upper molar series 

 (alveoli) 21-5. 



Ilab. as above. 



Ti/pe. Adult female. B.M. no. 20. 8. 4. 57. Original 

 number 984. Collected 30th March, 1920. 



This mountain chinciiilla, although very like L. lockwoodi, 

 differs from it by so many details that it evidently needs 

 description as new. In making the comparison I have had 

 available five examples of lockwoodi and six of famatincBj 

 and the differences, such as they are, are perfectly uniform 

 throughout the series. 



The three skins are all in changing pelage, the \\q\y winter 

 fur — grey — coming up among the old faded summer coat, 

 which is of a dull drab-colour. Neither winter nor summer 

 fur agrees in colour with that of lockwoodi, of which our 

 available specimens are in fresh summer coat. 



9. Galea comes, Thos. 

 S . 912, 928 ; ? . 932, 963. La Invernada. 



10. Marmosa elegans pallidior, Thos. 



S . 964, 991, 1005, 1012 ; ? . 1009. La Livernada and 

 Potrerillo. 



XLVir. — On Mammals from Ceram. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum,) 



The British Museum has received a collection of small 

 mammals — mostly rodents — obtained by Messrs. Charles, 

 Felix, and Joseph Pratt in the island of Ceram while engaged 

 on a zoological exploration of the Dutch East Indian Islands. 

 The majority of the speciniens were collected at an altitude 

 of about 6000' on Mount Manusela, the high mountain in the 

 centre of the island. 



