File:Spaulding02.jpg

Figure 2. Drawings illustrating the parts of the external genitalia at the beginning of the definitive period

A, male embryo 45 mm. long (Specimen No. 948)

B, female embryo 49 mm. (Specimen No. 2256). X 20.

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Reference

The development of the external genitalia in the human embryo By Milo Herrick Spaulding, Of the University of Montmxa, Stale College of Agriculture, Bozeman. With four plates and two text-figures.