Mr. R. P. Tomes on the genus Kerivoula. 485 



shortest, and with the cerebral region most elevated, closely approach- 

 ing Furipterus in this respect. It also has the facial portion more 

 depressed, and the notch between the intermaxillary bones less deep 

 than in K. picta ; and these bones are not so much separated at their 

 anterior extremities as in that species, so that the incisors which they 

 bear are less separated also, and have an inward deviation from the 

 line of the other teeth, contrary to what has been stated in the generic 

 description. However, in this species, the upper incisors by no 

 means approximate each other closely, as they do in Furipterus. In 

 other respects the crania of K. picta and K. lanosa do not differ 

 materially ; and the dentition is also so similar as to present scarcely 

 any differences worthy of notice. The outer incisor in the lower 

 jaw has precisely the same central elevated cusp already noticed, and 

 is similar in l)0th species ; but the skull of the third species, K. cerosa, 

 has, on the contrary, the top of the skull less elevated than in K. 

 picta, and the facial depression scarcely so deep, owing chiefly to the 

 hinder extremities of the nasal bones having a somewhat inflated 

 form. The facial portion of the skull is rather long in proportion to 

 its entire length ; and the bones of which it is composed are much 

 thicker than in the other species, giving support to much longer and 

 stronger teeth. Indeed the whole skull and teeth are much more 

 substantial than the other and more typical species of tlie genus. 



The lower jaw, with its teeth, is of proportionate strength, and is 

 rather thick at the symphysis menti, where it has a slight descending 

 process. 



In number the teeth resemble those of the other species, but differ 

 somewhat in their form. The outer lower incisors, although they 

 have the central principal cusp already mentioned, yet have it so little 

 developed that it would scarcely be regarded as singular if previous 

 notice had not been called to it*. The upper incisors present a 

 remarkable deviation from what appears typical : instead of two 

 pairs of well-developed teeth, we find that the inner ones are long 

 and pointed, but the outer ones merely rudimentary, so that they 

 can scarcely be seen without the aid of a lens. The upper canines 

 are long, strong, and angular ; and the premolar next to them is 

 also long and pointed. These differences in the teeth are alone suf- 

 ficient to distinguish this species. 



* It is curious and interesting to note ttie very slight outward deviation from 

 the more typical forms, exhibited by this species, and to find on examination that 

 it possesses also an internal departure from the same typical standard ; and it is 

 satisfactory to find that these differences are such as accord well with each other, 

 externally and internally. The sUghtly more bulky appearance of the animal, ac- 

 companied by membranes of less delicate nature, and more imperfectly marked 

 with the veins and papillEe which are so characteristic of this and the allied 

 genera, is associated with an osseous system of greater solidity, and with upper 

 incisors which approach in their inequality of size those of many of the species 

 of the robust geiuis Scotophilus. If we examine, for instance, the upper incisors 

 of the Nodule or the Hairy-armed Bat, we shall perceive at once tliat the inner 

 ones are much the largest, just as they are in A', cerosa ; and in those stout species 

 of the genus Vespertilio which have a near affinity with Scofophilus, the same 

 thing is observable. 



Ann. tV Mag. N. Hist. Ser. 3. Vol. ii. 33 



