285 
nexed diagram. The first upper incisor 7! exhibits in two stages a 
small labial outgrowth of the dental lamina. 
| (Am) 
C1. 2 wy ib is Ihm. eb 3pm. Anja 
Tl, 
=n > wur = rm rn 
Pmk ty S 2) Ci > fi u) Go “2 
DAR (i) Uy. C pm ; y 
4 pm3. ay oat 
(Afım 4) 
Diagram showing the relations of the germs of the teeth of Dasyurus to the dental 
lamina, as far back as the 1st molar, Pmk. the premilk teeth. The vestigial teeth are 
indicated by enclosing their abreviations in brackets. The calcified tooth-vestigies are in- 
dicated as black masses. 
The second upper incisor #2, exhibits a constant labial develop- 
ment of the dental lamina and in all cases a small irregular calcified 
toothlet is found related to this; in the older stages the enlargement 
of «1 displaces ¢2 backwards but the labial toothlet is not disturbed 
hence it appears to develop at this stage besides «1, this toothlet al- 
most cut the gum. Between ©? and the next functional incisor is a 
somewhat larger gap through which the dental lamina is continued, 
in this diastema in two stages a small labial calcification was observed 
in relation to an outgrowth of the dental lamina and in one specimen 
a second calcification was observed in connection with the deeper 
seated dental lamina the latter having the relation to the former of 
a successor to its predecessor, this is evidently the lost incisor and 
from its position must be 23, 
The 3rd functional incisor now ®4, shows in four of the stages a 
labial outgrowth from the neck of its enamel organ, and related to this 
is frequently a small calcified toothlet. 
The last upper incisor «5, is very late to develop and occasionally 
shows a small labial outgrowth of the dental lamina. 
The lower incisors in the adult are three in number, but in the 
young traces of 5 may be identified. 
The first lower incisor 71, is quite vestigial appearing only as a 
slight isolated swelling of the dental lamina. The second lower in- 
