. The Cephalopoda. Cephalopoda. Oegopsida sacc; v. etl prost. can cil. ves. sem. 2 figure 14. Cross section of the genitalia of a male Illex (at the level of y in Figure 12). The descending branch of the 3rd part of the seminal vesicle is cut at the left, the ascending branch at the right. The swelling (>v.) is recognizable in the second part of the seminal vesicle (\w. sem. 2), as in the 3rd part. can. cil. ciliated canal; v. blood vessels .sacc' diverticulum of genital pockets between vas efferens and spermatophore sac. Other lettering as in Figure 13. A dashed line indicates the epitheli
. The Cephalopoda. Cephalopoda. Oegopsida sacc; v. etl prost. can cil. ves. sem. 2 figure 14. Cross section of the genitalia of a male Illex (at the level of y in Figure 12). The descending branch of the 3rd part of the seminal vesicle is cut at the left, the ascending branch at the right. The swelling (>v.) is recognizable in the second part of the seminal vesicle (\w. sem. 2), as in the 3rd part. can. cil. ciliated canal; v. blood vessels .sacc' diverticulum of genital pockets between vas efferens and spermatophore sac. Other lettering as in Figure 13. A dashed line indicates the epithelium of the body cavity in Figures 13 and 14. 38 Figure 14 is a cross section at a slightly higher level; it shows that the large second part of the seminal vesicle and the adjacent proximal part of the first part of the vesicle project separately into the genital pocket and that the narrow bridge mentioned above is the only connection between them and the other parts. The distal part of the seminal vesicle also projects freely into the pocket. The ciliated canal appears in the cross section between the prostate and the seminal vesicle. Other details are explained in the legends; the dashed line represents the epithelium of the body cavity into which the vas efferens opens. The female genital ducts—unlike those of the male—are nearly always paired. Pterygioteuthis is the only exception I know: it has a well-developed right oviduct, but no oviduct on the left side. Since most of my specimens were immature or juvenile, all I can state is that the female genital ducts, like those of the male, always develop dorsal to the base of the gills. Their paired struc- ture reflects a primitive condition, in contrast to the unpaired "anlage" of the left oviduct in the Myopsida. This view is confirmed by the work of Doring (1908), who demonstrated that the oviduct gland of the Myopsida is paired in the "anlage" but disappears secondarily on the right side. The oviduct g
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
