Archive image from page 378 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( INTERNAL GENERATIVE ORGANS OF THE MALE. 665 The Ejaoulatory Sac and Duct (Fig. gi) differ from the parts already described in having a thick cuticular intima; this often exhibits a remarkable sclerite in the wall of the ejacu- latory sac, which fo
Archive image from page 378 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( INTERNAL GENERATIVE ORGANS OF THE MALE. 665 The Ejaoulatory Sac and Duct (Fig. gi) differ from the parts already described in having a thick cuticular intima; this often exhibits a remarkable sclerite in the wall of the ejacu- latory sac, which forms the inner extremity of the ejaculatory duct. In the Blow-fly the ejaculatory sac is ovoid in form ; it measures '25 mm. in its long diameter. A remarkable fan- shaped sclerite is developed in its intima. The sac consists of a thick muscular coat; the loops of muscle which surround the organ and form this coat arise from, and are inserted into, the sclerite. The vas deferens and ejaculatory duct are both connected with the same pole of the ejaculatory sac, which appears to be Fin. 91.—The ejaculatory sac of the Blow-fly. de, ductus ejaculatorius ; w, muscu- 1 ir coat covering the sac ; s, sclerite ; vd, vas deferens. a vesicular dilatation of the cuticular intima of the ejaculatory duct. In many Diptera, as in Tipula, the sclerite in the wall of the sac exhibits a long lever-like process, which projects into the body cavity. Its strong muscular wall suggests that it acts as a pump and drives the seminal fluid through the narrow ejaculatory duct by its contractions. The Ejaculatory Duct (Fig. 91) is nearly 2'o mm. in length, and extends from the ejaculatory sac to the free extremity of the penis. Its wall exhibits a muscular coat from its com- mencement to the root of the penis; its lumen measures about •2 mm. in diameter. It has a thick, apparently homogeneous, cuticular intima. It is very elastic and extensile.
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