[7] For the opportunity of examining the skull of an adult male from Balabac I am indebted to the courtesy of Mr. D. G. Elliot. A photograph (slightly reduced) of this specimen was published by Mr. Elliot in 1896 (Field Columbian Museum, Publication II, Zoological Series, I, No. 3, pl. XI, May, 1896). [8] Measurements in parentheses are those of an adult male topotype of _Tragulus nigricans_. [9] Measurements in parentheses are those of a less mature specimen from Bunguran. [10] Measurements in parentheses are those of a Tenasserim specimen (female) of _Sus cristatus_ so young that the posterior molar is not fully in place. [11] Last molar not fully grown. [12] See Proc. Biol. Soc. Washington, XIII, pl. III and IV. [13] Collector's measurement. [14] Measurements in parentheses are those of the type of _Mus validus_. [15] In the type of _Mus mülleri_ the diastema is 12 mm. [16] Ann. and Mag. Nat. Hist., 6th ser., XIV, p. 450. December, 1894. [17] Measurements in parentheses are those of an adult male topotype of _Sciurus tenuis_. [18] Measurements in parentheses are those of an older specimen of _Sciurus natunensis_ from Sirhassen. [19] Measurements in parentheses are those of an adult _Sciurus notatus_ from Borneo. [20] Measurements in parentheses are those of an adult Bornean _Sciurus notatus_. [21] Measurements in parentheses are those of the type of _Ratufa melanopepla_. [22] Teeth very much worn and many of them absent. [23] Measurements in parentheses are those of a young adult _A. stigmatica_ from British North Borneo. [24] Tooth measurements are from a younger specimen (male) with perfect dentition. [25] Measurements in parentheses are those of an adult male Bornean _Tupaia tana_. [26] Measurements in parentheses are those of an adult skull of _Pipistrellus pipistrellus_ from Switzerland. [27] Ann. Mus. Civ. di Storia Nat. di Genova, Ser. 2, X, p. 923, pl. XI, 1892. [28] Measurements in parentheses are those of an adult female _Rhinolophus affinis_ from Trong, Lower Siam. [29] Proc. Washington Acad. Sci., II, p. 234. August 20, 1900. [30] Proc. Acad. Nat. Sci. Philadelphia, 1898, p. 316. July, 1898. * * * * * Transcriber's Note: Obvious typographical errors have been repaired. _Underscores_ surround italicized content. End of the Project Gutenberg EBook of Mammals Collected by Dr. W. L. Abbott on the Natuna Islands, by Gerrit Miller