‘in existing Species of Felide. 333 
the structure of the bulla and the height of the partition 
agree, broadly speaking, with those of the lynxes and of the 
species of the Felis group in the restricted sense of that 
term (fig. 7). 
Another point worth attention is the apparent corre- 
spondence, partial at all events, between the structure of 
the bulla and the habitat of the species. Although in the 
Fig. 7. 
— 
a er 
im 
B 
Acinonyx jubatus, (Brit. E. Africa.) 
A. Right bulla, from outer side. 
B. The same, from inner side, with inner chamber laid open. 
p., partition; w., periotic ; p.’, line of origin of partition. 
present state of our knowledge, it is impossible to make a 
general statement on the matter, a review of the facts 
suggests that, broadly speaking, the species with a low 
partition and a very small outer or auditory chamber inhabit 
forest or jungle, whereas those with a high partition and 
large outer chamber frequent open country. For instance, 
Felis manul, Lynx isabellinus, and Uncia uncia occur in rocky 
Ann. & Mag. N. fist. Ser. 8. Vol. xviii. 23 
