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T'nna, P. 
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EXPLANATION OF PLATE 5. 
Both drawings made with tlie aid of an Abbe camera lucida. 
AUHUKVIATIONS. 
ca. Caudad. st. cm. Stratum corneuni.' 
ce. Ceplialad. st. grn. Stratum grauulosuui. 
e\lrm. Epidermis. .s<. 3f/j;/. Stratum Malpighii. 
drin. Dermis. v<uj)i. Vagina. 
Fig. 1. Median longitudinal section through introlliis vaginae of young 
Peroimjscus (view of the right face of section). 
The letters ca. and ce. lie close to terminations of branched glandular 
structures. 
Fig. 2. Median longitudinal section through uUroitus vaginae of adult 
Peromyscus, shortly after birth of young (view of the right face of section) . 
1 Slightly more than one half the original thickness of this layer is shown. 
