File:Text-book of comparative anatomy (1898) (14592837867).jpg

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Identifier: textbookofcompar01lang (find matches)
Title: Text-book of comparative anatomy
Year: 1898 (1890s)
Authors: Lang, Arnold, 1855-1914 Bernard, Henry Meyners Bernard, Matilda Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Anatomy, Comparative
Publisher: London, New York, Macmillan and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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too- 258 COMPARATIVE ANATOMY CHAP. penis. The bursa is a spacious sac-like imagination of the posteriorend of the body which can be evaginated in copulation. Three pairs of cement glands are generally con-nected with the male apparatus, theirducts entering the terminal division ofthe vas deferens (ductus ejaculatorius).Annulata. - - The Hirudinea arehermaphrodite. Their male genitalapparatus (Fig. 173) has the followinggeneral structure. Several testes liein pairs segmentally arranged in themiddle region of the body, generallybetween the consecutive lateral diver-ticula of the mid-gut, within the muscu-lar septa separat-ing these diverti-cula; the testesthus divide thesesepta into anteriorand posterior lam-ella?. A short effer-ent duct arisesfrom each testis.The ducts of allthe consecutivetestes of one sideemerge into a vasdeferens whichthewhole length of
Text Appearing After Image:
—vd FIG. 172.—Representation, partly dia-grammatic, of the organisation of a maleEchinorhynchus. r, Proboscis with barbedhooks, protruded ; nn, retractor muscles ofthe proboscis ; rs, proboscis sheath ; rn,proboscis nerves ; g, cerebral ganglion ; re,retinacula; li, ligament; sn, longitudinalnerves; h, testes ; vd, vas deferens; sb,vesieulce seminales; kd, cement glands ; gg,common vas deferens; gag, genital gan-glion ; bs, bursa; mo, male genital aperture ;Ih, body cavity ; p, penis ; I, lemnisci. runs throughlengththe testicle region.In front of themost anterior tes-tis the two vasadeferentia con-

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