MACROPID..—PETAURUS, 119 
Fam. 4. MACROPIDA. 
ACROBATA. 
Teeth :—Incisors © = ; Canines *- at : Premolars =% ; Molars = 55 =86. 
The Orossum Mouse. Acrobata pygmea. 
Owen, Odont. pl. 100. fig. 5 (lower jaw), text p. 886.— Waterhouse, 
Nat. Hist. Mamm. i. pl. 19. fig. 5 (skull). 
Cervical vertebre.............. 7 
Dorsal sys 3. aicrsnceeiscde patauien tae 14 
Dumbar “secre cw etn esa nites 5 
Daerall | ices are stewart Adalocs atealecens 2 
Cadac trian trsig dir eee mae 29 
*a. Skull. New Holland. From Mr. Gould’s Collection. 
6, c. Skulls. From the Zoological Society’s Collection. 
d. Skeleton: male. From Mr. Stevens’s Collection. 
PETAURUS. 
Teeth :—Incisors <2 = 3 Canines 1 = a a Premolars => ; Molars =; =40, 
The Suear Saurrret. Petaurus sciureus. 
Cervical vertebre. ............ 7 
D OVS 55, Fose eusand eden cm ea ea tone 14 
PUM WAI gnsier aca, dh aay acoder aaa 5 
Sactall sc S4cs sas ask ey Sod alte as 2 
Cadal sv sisa ganas arene ews 17 
. Skeleton. New Zealand. Presented by Captain P. P. King. 
Skeleton (imperfect). From the Zoological Society’s Collection. 
~s 
The Suort-nxapEp Peraurvs. Petaurus breviceps. 
Waterhouse, Trans. Zool. Soc. ii. p. 404. pl. 3 (base of skull). 
Cervical vertebre............0. « 
Dorsal: g.scd9.s asc b a oa seas Adis 13 
Ti Oa jek ea on eve a ees 6 
Sacral 2 gis-dacecd lees een see Oth 3 
Caridal 3: cu tarle aime eawa ae 19 (imperfect). 
a. Skull. Australia. 
b. Skeleton. Australia. From Mr. Prince’s Collection. 
The Aniet. Petaurus ariel. 
*a, Skull. Port Essington. Presented by Capt. W. Chambers, R.N. 
