. On the anatomy of vertebrates [electronic resource] . ctum, then passesto the interspace betweenthe rectum and roots of thepenis, converging along thelateral and posterior part ofthe penis, to be insertedwith the opposite muscle atthe base of the glans. Inthe Opossum and those Mar-supials which, having a bi-fid glans, enjoy, as it were,a double coitus, there is a(levator penis, fig. 504,f,f,which is not present in theKangaroo. Each portion of this muscle takes its origin fromthe fascia covering the crus penis, converges towards its fellowabove the dorsum penis, diminishing as it converges, a
. On the anatomy of vertebrates [electronic resource] . ctum, then passesto the interspace betweenthe rectum and roots of thepenis, converging along thelateral and posterior part ofthe penis, to be insertedwith the opposite muscle atthe base of the glans. Inthe Opossum and those Mar-supials which, having a bi-fid glans, enjoy, as it were,a double coitus, there is a(levator penis, fig. 504,f,f,which is not present in theKangaroo. Each portion of this muscle takes its origin fromthe fascia covering the crus penis, converges towards its fellowabove the dorsum penis, diminishing as it converges, and termi-nates in a common tendon inserted into the upper part of the baseof the glans. There is another powerful muscle which, thoughnot immediately attached to the penis, must exert in all Marsu-pials an important influence upon its erection. This is the external sphincter cloacae: it is an inch and a half in breadth in theKangaroo, and half an inch in thickness ; from the back of thetermination of the rectum it passes over the anal glands and sides. Male organs, Opossum, ccxxxv MALE ORGANS OF RODENTS. G49 50-5 of the base of the penis, inclosing the two bulbs with Cowpersglands and their muscles, and terminates anteriorly in a strongfascia above the dorsum penis, so as to compress against that partthe venas dorsales. In all Marsupials the penis is bent upon itselfwhen passive and retracted; with the glans concealed just withinthe cloacal aperture, from which it emerges, as in oviparous Ver-tebrates, when the penis is turgid and erect. § 371. In Rodentia.—Here, likewise, the penis is habituallyretracted out of view, being strongly bent, in many (e. g. Sciurus,Castor) in a sigmoid curve, with the glans directed backward,fig. 497, 5, within a prepuce, which opens into, or forms partof, the common passage, ib. g, e, a, in which the rectum, ib. b,terminates. The testes undergo a periodical increase of sizeand change of position, passing from the abdomen into a ses-sile scrotum
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