912 ROBERT COLLETT, 



or two of the present specimens from Queensland the suture, however, 

 but meets the centre of the tooth, and in one the position is still 

 more normal, as the suture (on one side) lies entirely in front of the 

 tooth. 



Finally it may be remarked that in this species the os zygoma- 

 ticum in its connection with the upper jaw forms a distinct process 

 downwardly directed, which is so well known in the Macropodidae^ but 

 almpst imperceptible in the Pseudochiri. 



In the young specimen (A), which was but scantily covered 

 with hair, and in which the skull has a length of 39 mm, width 27 mm, 

 only one tooth is fully developed (or almost so), namely the milk pre- 

 molar. This resembles considerably the permanent premolar in the 

 fullgrown individual (p^), but has a well defined posterior cusp 

 which is at least as long, as the anterior; furthermore the teeth have 

 a normal position in the jaw, and are not, as in the older ones, 

 directed obliquely outwards. Above the root of the milk premolar 

 the germ of the permanent p'^ can l)e perceived, but l^arely half 

 developed. 



The other teeth in the young are in the point of appearing, or 

 are not developed. 



41. Pseudochirus archeri Coll. 1884 (Typus). 



Phalangista {Pseudochirus) archeri Coll. in: Proc. Zool. Soc. Lond. 1884, 

 p. 381, PL 29 and fig. 1—2, p. 382—83 (1884). 



Diagnosis: Ears short. Für very close; tail thicke- 

 ned at the root, the end with short adpressed hairs, 

 The colour (male): a mixture of yellowish green and 

 grey;back darker with two yellowish white longitudinal 

 stripes. Under surface white. A white patch at the base 

 of the ears. Tail yellowish grey, with whitish tip. 



Nasalia very broad behind; in the suture with the 

 frontalia they form on obtuse angle (open in front). The 

 intermaxillary suture divides the nasal suture consi- 

 derably before the middle. Auditory bullae verysmall. 

 Foramina palatina wanting; foram. incisiva short. 



The dental series almost unbroken. The upper c is 

 larger than i^. The lower i is proportionally short, 

 with an upwards curved point; the 2 anterior premo- 

 lars are wanting. 



Dentition: i f, c |, p f, m f (36). 



