. Elements of comparative anatomy. Anatomy, Comparative. Fig. 101. Testes and efferent ducts of Acheta campestris. t Testes. v Vns deferens. <j Seminal vesicle. Fig. 1(12. Male generative organs of Melo- lontha vulgaris, t Testes. r<Z Vas defe- rens, v's Its widened portion, gl Coiled appended gland. either of several tubes connected together to form a fan-like organ, or of a large number of separate tubes; this form of testis is also found in a large number of the Coleoptera. The testes of most Orthoptera consist of closely-applied tubes, which thus form a single mass, or of rounded ves
. Elements of comparative anatomy. Anatomy, Comparative. Fig. 101. Testes and efferent ducts of Acheta campestris. t Testes. v Vns deferens. <j Seminal vesicle. Fig. 1(12. Male generative organs of Melo- lontha vulgaris, t Testes. r<Z Vas defe- rens, v's Its widened portion, gl Coiled appended gland. either of several tubes connected together to form a fan-like organ, or of a large number of separate tubes; this form of testis is also found in a large number of the Coleoptera. The testes of most Orthoptera consist of closely-applied tubes, which thus form a single mass, or of rounded vesicles grouped in a racemose fashion ; similar structures are also found in the Hymenoptera. The efferent ducts of the separate testicular tubes are united into seminal ducts, and these, on each side, into a vas deferens (Fig. 161, v; Fig. 162, vd), which, when the tubes are closely united, passes directly from them. The two seminal ducts are, as a rule, not very long, but in some cases they are considerably elongated, and the widened portions of the coiled canals then function as seminal reservoirs (Fig. 162, vs). A common efferent duct (ductus ejaculatorius) is given off from their point of union ; this, too, varies, greatly in length, and also serves in part as a reservoir for the sperm. The accessory glandular organs are as a rule paired, and like those of the female apparatus are either long coiled canals (Fig. 162, gl),. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gegenbaur, C. (Carl), 1826-1903; Bell, F. J. (Francis Jeffrey), 1855-1924; Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London, Macmillan and Co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectanatomycomparative
