380 Zoological Society : — 



dimensions in the two other columns have^been taken from specimens 

 in my own collection, and are also from Western Australia, but the 

 exact locality unknown. 



The comparative description and measurements of the crania of 

 this and the other species wiU be given in a collected form appended 

 to the description of the species the last on the Ust, so as to render 

 their differences more readily apparent : — 



1. 2, 3. 



in. lin. in. lin. in. lin. 



Length of the head and body (about) . . 18 



of the tail 1 4 



of the head 7i 



of the ears 9 



of the tragus 2\ 



Breadth of the ears 6 



of the tragus \\ 



Length of the fore-arm 1 4 



of the longest finger 2 4 



of the fourth finger 1 9 



of the thumb 2| 



of the tibia 7 



of the foot and claws 3 



of the OS calcis . . . , 5 



Expanse of wings, about 9 



2. Nyctophilus Timoriensis. 



Vesp. Timoriensis, Geoff. Ann. duMus. nii. p. 200. t. 47, 1806 ; 

 Desm. Mamm. p. 146, 1820; Fisch. Synop. Mamm. p. 118, 1829; 

 Temm. Mon. ii. p. 253, 1835-41 ; Wagn. Supp. Schreb. i. p. 520, 

 1840 ; Schiuz, Synop. Mamm. i. p. 175, 1844. 



Vesj}. Timoriensis ?, Temm. Mus. Leyd. 



Plecotus Timoriensis, Less. Man. p. 97, 1827 ; Is. Geoff. Guerin 

 Mag. de Zool. 1832 ; Less. Nouv. Tabl. Regn. Anim. p. 23, 1842. 



The forms of this species are so similar to those of the last, that it 

 is needless to enter at greater length into details of description than 

 is necessary to point out the differences between the two. 



In all the specimens I have been able to examine, viz. the original 

 one in the Paris Museum, and three others collected in Australia by 

 Mr. Gould, the ears are strongly sulcated, even more so than is obser- 

 vable in the Plecotus auritus, whilst in the preceding species they 

 are very faintly, if at all, so marked ; and instead of the small tufts 

 of bristle-Uke hairs about the eyes, the present species has a to- 

 lerably regular series of similar ones fringing the eyelids. Again, 

 the cranium has so strongly marked a sagittal crest as to be easily 

 detected in the mounted specimens, whereas in N. Geoffroyi it is 

 so feebly developed that no trace can be discovered, unless the 

 skull be extracted and carefullv cleaned. 



