INTRODTTCTION. IX 



Diastema (in Macropodicke and Phaseolomyidm). — From the back 

 of the alveolus of the la^t incisor to the front of that of the 

 most anterior of the cheek-teeth, generally p.* 



Basi-eranial axis. — From the " basion " to the suture between 

 the basi- and pre-sphenoid bones, giving the combined lengths 

 of the basi-oocipital and basi-sphenoid bones. As already 

 shown elsewhere *, this is a better axis for ordinary zoological 

 work than the theoretically superior, but practically unattain- 

 able, axis proposed by Professor Huxley f. 



Basi-facial axis. — From the sphenoid suture to the gnathion. This 

 axis, now proposed for the first time, forms the natural 

 complement of the last, and shows very fairly the length of the 

 muzzle and jaw. 



Facial index. — The ratio that the Basi-facial bears to the Basi- 

 cranial axis, the latter being taken as 100. This index gives 

 with a minimum of trouble an exact numerical idea of the 

 relative proportions of the cranial and facial portions of the 

 skuU. 

 In the yooi^-measurements : — 



Length always means horizontal antero-posterior length unless 

 otherwise stated. 



Length of ms.'-^ — Greatest combined length of the three anterior 

 molars in situ. 



As in the other Catalogues of the present series, the affixes to 

 the names of the Donors, &c., are as follows: — "[P.]" signifies 

 " Presented by " ; " [C] " " Collected by " ; and " [E.] " " Eeceived 

 in exchange from." 



In conclusion, it is my pleasant duty to return my sincere thanks 

 to the many friends, both at home and abroad, who have assisted me 

 in the preparation of this Catalogue. Of those abroad I am indebted 

 to Dr. F. A. Jentink, Director of the Leyden Museum, to Prof. 

 Milne-Edwards and M. Huet, of that at Paris, to Dr. Krauss at 

 Stuttgart, to Dr. Eeichenow at Berlin, Dr. A. B. Meyer and 

 Dr. Haase at Dresden, Dr. von Pelzeln and Dr. von Lorenz at 

 Vienna, and to the Directors of many of the smaller continental 

 Museums, both for much personal kindness and for the facilities I 

 have everywhere enjoyed for the study of the typicEil or other speci- 

 mens under their respective charges. These facilities have enabled 



* P. Z. S. 1882, p. 65, and 1884, p. 451 (footnotes). 

 t P. Z. S. 1880, p. 240. 



h 



