CURVE OF SPEE IN MAMMALS 
169 
Simia satynis, Hylobates miilleri, Macacus cynomolgus, NasaKs lar- 
vatus, Semnopithecus femoralis, Macacus nemestrinus, Rhinoceros, 
Camelus bactrianus, Lama huanacho, Rangifer tarandus, Porcus 
babyrussa and Dicotyles (sp.)- 
2. The group of skulls in which the curved Hne corresponds to the 
arc of a circle but does not touch the anterior face of the articular 
surface of the condyle or K. To this group belong the muskrat and 
the opossum. 
3. The group of skulls in which the cxirved line possesses several 
maxima, thus forming an undulating curve. Most camivora, Tragu- 
lus javanicus and Cervulus muntjac belong to this group. 
0 
Fig. 3. Showing the Projection of Each Buccal Cusp of the Bicuspids and Molars 
IN THE Case of the Raccoon 
The curved line connecting the points of projection shows an undulation 
The existence of this kind of curve was evidently unnoticed by 
Spee, and it may be worth while, therefore, to describe it more in 
detail. As an example the curve given by the jaw of a Procyon lotor 
(raccoon), specimen 6008, is taken. The raccoon which belongs to 
the family of the Procyonidae, has the following dental formula: 
I 
3-3 
3-3 
C 
1 - 
1 - 
1 
1 
PM 
3-3 
3 - 
3 
M 
3 - 
3-3 
3 
= 40 
As is shown in figure 3 the line connecting the posterior half with 
the front half undulates owing to a shght dip, especially at the first 
