. Bulletin. Natural history; Natural history. 66 Illinois Natural History Survey Bulletin Vol. 31, Art. 2 Ampulla Prostot. Vas Deferens -Schematic drawing (side view) of the reproductive system (X ) of an adult molel Fig. raccoon. unite inside the prostate to form a com- mon duct. The many compartments of the prostate gland open into this duct system. The OS penis or os baculum (bone of the penis) is well developed in the rac- coon. Its stage of development has been used to separate males into two age groups (Sanderson 1950: 395-396; 1961a: 11-14). The os baculum was once used by tail
. Bulletin. Natural history; Natural history. 66 Illinois Natural History Survey Bulletin Vol. 31, Art. 2 Ampulla Prostot. Vas Deferens -Schematic drawing (side view) of the reproductive system (X ) of an adult molel Fig. raccoon. unite inside the prostate to form a com- mon duct. The many compartments of the prostate gland open into this duct system. The OS penis or os baculum (bone of the penis) is well developed in the rac- coon. Its stage of development has been used to separate males into two age groups (Sanderson 1950: 395-396; 1961a: 11-14). The os baculum was once used by tailors as a ripping tool for taking out basting threads (Jaeger 1947: 297). We found several raccoon bacula that had been broken and then healed. Sand- erson (1950: Plate 11) showed a photo- graph of some of these bones. Our data from wild males shed some light on pos- sible causes for these broken bones. Dur- ing four hunting and trapping seasons in Illinois (1957-1958 through 1960- 1961), 7,233 bacula from juvenile rac- coons were examined. Forty-three ( percent) of these had been broken but were healed or healing, and 238 ( per- cent) were freshly broken. At the same time, 4,152 bacula from adults were ex- amined. Eighty-six ( percent) of these had been broken but were healed, whereas 41 ( percent) were freshly broken. These data indicate that most of the breaks in the os baculum of the raccoon occur in juveniles. The bacula of juven- iles are much softer and more easily broken than are those of adults. Hunters often shake a raccoon out of a tree and let their dogs fight it. Fighting with" dogs could account for the freshly broken bones found in both adults and juveniles, and the more durable bones of adults would explain the smaller percentage of freshly broken bacula found in older raccoons. Females The raccoon uterus (Fig. 13) is some- what intermediate between the bicornuate uterus found in the pig and insectivores, and the bipartite uterus found in the cat
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