. Fig. 6. Dissection to show the development of the male reproductive system, y 15. afl, anterior flexure; ej, ejaculatory duct; ", gut; Ip, lateral pocket; pfl, posterior flexure; sps, spermatophore sac; t, testis; vd, vas deferens. Raab (1915) determined the histology and function of the various parts of the repro- ductive system. He found that in the region of the anterior flexure afl, the lumen of the vasa deferentia is fairly wide and is lined with flattened cells of pavement epithelium. In mature males it is full of spermatozoa. The lumen is not so wide in the region of the posterio
. Fig. 6. Dissection to show the development of the male reproductive system, y 15. afl, anterior flexure; ej, ejaculatory duct; ", gut; Ip, lateral pocket; pfl, posterior flexure; sps, spermatophore sac; t, testis; vd, vas deferens. Raab (1915) determined the histology and function of the various parts of the repro- ductive system. He found that in the region of the anterior flexure afl, the lumen of the vasa deferentia is fairly wide and is lined with flattened cells of pavement epithelium. In mature males it is full of spermatozoa. The lumen is not so wide in the region of the posterior flexure pfl, being lined with columnar epithelium and containing, in addition to spermatozoa, a secretion which is the product of the epithelial cells. Behind the posterior flexure, where the lateral pocket Ip opens into the duct, the lumen widens again and the epithelium flattens. Chun (1896) called this part of the vas deferens the spermatophore sac sps (Figs. 7 and 8), and in mature specimens a spermatophore in process of formation is to be found in each sac. The spermatozoa,
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