. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1418 VESICULA PROSTATICA. corresponding vas deferens. Its cavity is that of a canal, but not so wide a one as might be guessed from the exterior thickness of the body ; and it opens by a distinct aper- ture on the vernmontannm. Pinnipedia. — The genitals of a young male seal, probably Phoca vitulma, were examined by me. Here I saw a scarcely visible linear fold, which led to a longish Weberian organ of about two lines in si/e. The fold lay close behind a small ridge-shaped vernmontannm, on which were the orifices of the
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1418 VESICULA PROSTATICA. corresponding vas deferens. Its cavity is that of a canal, but not so wide a one as might be guessed from the exterior thickness of the body ; and it opens by a distinct aper- ture on the vernmontannm. Pinnipedia. — The genitals of a young male seal, probably Phoca vitulma, were examined by me. Here I saw a scarcely visible linear fold, which led to a longish Weberian organ of about two lines in si/e. The fold lay close behind a small ridge-shaped vernmontannm, on which were the orifices of the vasa defe- rentia, situated close to each other. As in the dog, the organ is situated partly in front of, partly beneath, a prostate, which in form and development also corresponds with that gland in the dog. MarxnplnHa. — In DtdelpJii/s Virginiana the only animal of this order whose male genitals I had, no trace of the Weberian corpuscle was present. Rodentia. — The Weberian ortran showed manus, am nmphlbhis, I have looked for it in vain. But certain'y the My- oxus Vitclci, Dipiia JEgt/ptiacus and Cricetus vulgarix exhibited a single small longitudinally- folded verumontanum, which, from its situa- tion between the two orifices of the vasa de- ferentia, must have been the opening of a Weberian organ : but this structure isclf, on account of its sheer minuteness and hidden situation, eluded the further searches, which were made in only a few individuals. In Cavia cobaya the Weberian organ is, as I described it .some time since*, a small roundish vesicle, scarcely a line in size, which has a bilobed extremity, and, as in ]\Iacro- scelides, a constricted neck, which opens into the uro-genital canal between the two seminal ducts. The Weberian organ of the rabbit and hare is very much larger. It was formerly known to the older zootomists under the name of the azygous seminal vesicle-}-, and has only received a more accurate description and ex- Fig. Wetfrian Organ of tJ
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