Elements of Comparative Anatomy (1878) Elements of Comparative Anatomy elementsofcompar78gege Year: 1878 Fig. 161. Testes and efferent cincts of Acheta campestris. t Testes. V Vas deferens, g Seminal vesicle. Fig. 162. Male generative organs of Melo- lontha vulgaris, t Testes, vd Yas defe- rens. vs 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 th
Elements of Comparative Anatomy (1878) Elements of Comparative Anatomy elementsofcompar78gege Year: 1878 Fig. 161. Testes and efferent cincts of Acheta campestris. t Testes. V Vas deferens, g Seminal vesicle. Fig. 162. Male generative organs of Melo- lontha vulgaris, t Testes, vd Yas defe- rens. vs 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 Tlymenoptera. The efferent ducts of the separate testicular tubes are united into seminal ducts, and these, on each side, into a vas deferens (Fig. 161, t;; 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, rjJ),
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