fig. 3, was of no value in determining the age class. 
The baculum was somewhat porous at both the base 
and tip; yet the tip appeared to be too much ossified 
to be that of a juvenile but not sufficiently so to be that 
of an adult. Captive male No. 207 was approximately 
7 months of age when killed. This animal also could 
not be classified accurately by the baculum. When 
placed side by side, the bacula, fig. 3, of these two 
males appear to be from animals of the same age class, 
although the bone from male No. 121 is somewhat 
longer than that from No. 207. Wild male No. 219, 
J 
Be 
et Sl | 
Fig. 6.— Bacula from raccoons 12 to 46 months of age showing the effects of age and castration on development. Grid 
squares represent one-half inch. All bacula except Nos. 319, 219, 121, and 59 are of the adult type. 
No. 319: captive, estimated 12 months old, juvenile-type 
baculum. 
No. 219: wild, estimated 15 months old, intermediate- 
type baculum. 
No. 146: captive, estimated 18 months old; reared as a 
pet until 6 months of age. 
No. 87: captive, estimated 19 months old. 
No. 121: wild, estimated 19 months old, intermediate- 
type baculum. 
12 
approximately 15 months of age, also had a baculum, 
fig. 3, which could not be classified as adult or juvenile, 
but the base was slightly more porous than that of male 
No. 207. Male No. 308, reared as a pet until approxi- 
mately 5 months of age, had a baculum, fig. 5, of the 
adult type at 11 months of age. ' 
The ages of these animals (Nos. 121, 207, 219, and 
308) were accurately indicated by the epiphyseal plates 
of their radii and ulnae. One male (No. 121, fig. 3). 
approximately 19 months of age, had thin epiphyses, 
while two males (Nos. 207, fig. 3, and 219, not shown), 
% 
eee 
No. 200: wild, estimated 21 months old. 
No. 51: wild, estimated 21 months old. 
No. 59: captive, estimated 22 months old, castrated. 
No. 138: captive, estimated 23 months old. 
No. 82: captive, estimated 34 months old. 
No. 84: captive, estimated 34 months old. 
No. 13: captive, estimated 46 months old. 
