283 
of teeth I have thought it advisable to publish a preliminary account 
of my observations on these forms. 
Myrmecobius fasciatus. 
My material for the study of this interesting form consisted of 
several pouch embryos from the same batch as those examined by 
LEcHE, and several much older specimens obtained by Mr. H. B. Woop- 
warp, Curator of the Perth Museum, West-Australia. 
LecHE (3 and 4) has described and figured premilk precessors 
to the following teeth, «1, ©3, <2, 73 and ce, all of which with the ex- 
ception of that preceeding ¢3 are calcified. In addition to these I can 
now record calcified premilk teeth preceeding «3, «4, and ¢, but in my 
Specimen those preceeding ©! and ©2 were uncalcified. In the lower 
jaw I observed only the same premilk teeth as LEcHE has. 
The full pre-milk dentition being 
1 (2)3 4 1 
EU us 
In my older specimens all traces of the calcified premilk teeth 
were lost, but labial outgrowths of the dental lamina, were seen in 
connection with 2 
dpm 4 (3) 
dpm 4 (3) 
long before any of the otber cheek teeth, their supposed successors 
The deciduous premolars were found to be differentiated 
pom * were developed from the dental lamina in front of the former, 
ppm 4 
this being especially the case with ppm 4, which was situated so far 
in front of its precursor as to almost suggest a distinct premolar 
(12, p. 467). 
The antero-external cone (paracone) above and the corresponding 
cone below (protoconid) are the first cones which appear on the molar 
teeth. 
Peragale. 
My specimens of this Bandicoot were evidently too old to show 
calcified premilk teeth, but traces of labial outgrowths of the dental 
lamina were visible in connection with the following teeth. 
LOO >o® pm, © 
There was a suggestion of a 4th lower incisor behind the 34 func- 
tional tooth. 
The paracone in the upper and the protoconid in the lower molars 
was the first cusp developed. 
20 * 
