MAMMALIA. 25 



other very small rudimentary teeth, close on the outer side of the two longer ones, 

 were discovered. It is probable that these teeth fall out when the animal attains 

 its full size ; indeed, the constant changes which take place in the cutting 

 teeth of bats during their growth, and the uniformity that exists in the grinders, 

 renders the teeth of but secondary importance in the distinction of species, and 

 of but very little use in the construction of genera. 



It is probable that Vesper tilio canina, of Prince Maximilian, the Emballonura 

 canina, Temm. Monog. ii. 298. may belong to this genus. 



The Mosia. — Mosia nigrescens. 



Plate VI. fig. 2.-2 A. and 2 B. Head. 



Mosia nigrescens, Gray, Ann. and Mag. Nat. Hist. 1S43. 117. List Mam. Brit. Mus. 34. 



Dark brown, paler beneath. Interfemoral membrane with scattered hairs beneath. Ears 

 rather large, broad, rather acute at the tip, nakedish; hairy at the lower part; lobule in- 

 distinct. Tragus oblong, linear, rather curved, rounded at the end. 



Inhab. South America. 



In. Lin. 

 Length of the body and head 1 7 



tail 4 



shin bones 5 



fore-arm bones 1 5\ 



In. Lin. 



Length of the heel bone 4;| 



ear, front edge 4 



tragus 2 



The Diclidure. — Diclidurus Freyreissii. 



Plate VIII. Fig. 1, and 1 A. 



Diclidurus Freyreissii, Pr. Max. Isis, 1819, 1629. Gray, List Mam. Brit. Mus. 36. 

 D. albus, Pr. Max. Beitr. Naturg. Braz. ii. 242. Abbild. t. Temm. Monog. ii. 303, t. 60. f. 16. 

 copied from Pr. Max. 



Inhab. Pueblo Nuevo, Central America. 



This Bat has been hitherto only known from a single specimen discovered by 

 M. Freyreis, who found it at the mouth of the Rio Pardo. The specimen is now 

 in the collection of the Prince de Wied, at Neuvvied, on the Rhine. The Princes 

 specimen had been injured and was imperfect, especially about the head, which 

 has rendered it necessary that the animal should be re-figured, as the ears are 

 much larger, and the feet-bones are much stronger, than they are represented in 

 his plate. 



The interfemoral membrane is very large, truncated behind, and supported 

 on each side behind by a very long and strong heel-bone ; it appears in the 



