Mr. 0. Thomas on new Malayan Mammals. 407 



Mr. A. Agassiz found the following Echinoids : — 



Goniocidaris tuharia, Lamk. 

 Amhlypneustes formosusy Val. 



palliduSj Larak. 



Sphcerechinus australice^ A. Ag. 

 Echinanthus testudinarius, Gray. 

 Laganvm Peroni, Ag. 



There were no additional Grinoids or Holothurians. 



LIV. — Diagnoses of four new Mammals from the Malayan 

 Region. Bj Oldfield Thomas. 



1, Hylomys suiUus dorsalis^ var. no v. 



Essential characters as in the typical variety, but with a 

 more or less distinct black line running from between the 

 eyes down the neck to the middle of the back. 



Head and body (c.) 116 millim. ; tail 16 ; hind foot 25. 



Hah. Mount Kina Balu, North Borneo {Mr. J, White- 

 head). 



2. Sciurus concinnus, sp. n. 



Very similar to S. exilis, MiilL, but rather larger, and with 

 the colour of the back a deeper and more uniform rufous, 

 the general colour being almost as rufous as in the 

 common bank-vole [Evotomys glareolas, Schr.). The hind 

 feet are larger and heavier than in 8. exilis, and their hairy 

 part is of much less extent, the posterior part being covered 

 for less than 8 millim., as compared to more than 9 millim. in 

 the other ' and smaller species. This hairy part is grizzled 

 olive in 8. concinnus and yellow in 8. exilis. The posterior 

 sole-pad is oval instead of circular, and is situated much 

 further back on the foot, the distance from its front edge to 

 that of the middle digital pad being about 7*0 millim., as 

 compared to '6\ millim. in ;8'. exilis. The tail is longer and 

 rather bushier in 8. concinnus than in its Bornean ally. 



Turning to the skull we iind that the general shape is 

 much the same in the two species, but that the muzzle in 8. con- 



28* 



