CHAP. XVII BORNEO, J. 



AVA, AIS 



rD T] 



IE PHILIPPINES 377 



22. 



Tupaica gracilis. 





45. 



Sciurus atricapillus. 



23. 



, , melanura. 





46. 



,, caroh*. 



24. 



,, minor. 





47. 



,, bakiensis. 



25. 



Gymnura rafflesii, var. 



alba. 



48. 



, , rufoniger, var. pluto. 



26. 



Hylomys suillus, var. 



dorsalis. 



49. 



, , vittatus, var. dulitensis. 



27. 



Crocidura Krooiii. 





50. 



, , nigro vittatus, var. 



28. 



, , hosei. 







orestes. 



29. 



, , balueiisis. 





51. 



, , brookei. 



30. 



, , foetida. 





52. 



,5 jentiuki. 



31. 



,, doriaj. 





53. 



, , simus. 



32. 



Chimarrogale phaeura. 





54. 



Nannosciurus whiteheadi. 





Carnivora. 





55. 



Mus infrahiteus. 



33. 



Helictis everetti. 





56. 



,, bahiensis. 



34. 



Mustela flavigula, var. 



henrici. 



57. 



,, whiteheadi. 



35. 



Hemigale hosei. 





58. 



, , bseodon. 



36. 



Felis badia. 





59. 

 60. 



, , alticola. 



5 , ochracei venter. 





RODENTIA. 





61. 



, , niargarettse. 



37. 



38. 



Petaurista thomasi. 

 Sciuropterus thorn soni, 





62. 

 63. 



Chiropodomys major. 

 , , pusillus. 



39. 



, , hosei. 





64. 



Trichys lipura. 



40. 



Rhithrosciiirus macrotis. 





41 



Sciurus hosei. 







Ungulata. 



42. 



,, insignis, var. diversiis. 



65. 



Sus verrucosus, var. horneensis. 



43. 



, , everetti. 







Cetacea. 



44. 



pryeri. 





m. 



Sotalia horneensis. 



This extensive list of peculiar species does not necessarily 

 imply that the separation of the island from the continent 

 is of very ancient date, for its area is so great, and so much 

 of the once connecting land is covered with water, that the 

 amount of speciality is hardly, if at all, greater than occurs 

 in many continental areas of equal extent and remoteness. 

 This will be more evident if we consider that Borneo is 

 as large as the Indo-Chinese Peninsula, or as the Indian 

 Peninsula south of Bombay, and if either of these countries 

 were separated from the continent by the submergence of 

 the whole area north of them as far as the Himalayas, 

 they would be found to contain quite as many peculiar 

 genera and species as Borneo actually does now. A more 

 decisive test of the lapse of time since the separation took 

 place is to be found in the presence of a number of re- 

 presentative species closely allied to those of the surround- 

 ing countries, such as the tailed monkeys and the numer- 

 ous squirrels. These relationships, however, are best seen 

 among the birds, which have been more thoroughly 

 collected and more carefully studied than the mammalia. 



