. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SOLIPEDA. 743 numerous small bundles. Arrived at the pos- terior extremity of the testes, the epididymus folds back upon itself, to constitute the vas deferens ; which, at its commencement, is very tortuous, and forms a protuberance of considerable size (/). The rasa deferentia (I, MI, w) are upwards of fourteen inches in length, and, during the greater part of their course, about two lines in diameter ; but to- wards their termination they become, for a length of about seven inches, much dilated, here measuring upwards
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. SOLIPEDA. 743 numerous small bundles. Arrived at the pos- terior extremity of the testes, the epididymus folds back upon itself, to constitute the vas deferens ; which, at its commencement, is very tortuous, and forms a protuberance of considerable size (/). The rasa deferentia (I, MI, w) are upwards of fourteen inches in length, and, during the greater part of their course, about two lines in diameter ; but to- wards their termination they become, for a length of about seven inches, much dilated, here measuring upwards of fifteen lines in circumference (oo). The caliber of the in- ternal canal does not, however, expand in proportion to the dilatation of the exterior of the duct. Female Organs of Generation.— The gene- rative organs in the female solipeds offer no variations of structure from the usual type common to placental quadrupeds. The cli- toiis (fig. 519. a) is of great size, and is lodged in a cavity appropriated to its recep- tion, situated immediately above the inferior (i. e. anterior) commissure of the labia pudendi; its glans is enclosed in an ample prepuce, above which may be observed an orifice leading into a cavity big enough to lodge a small bean. The canal of the vagina is about a foot in length, and in its capacity corresponds with the ample dimensions of the penis of the other sex. Immediately behind the orifice of the ure- thra, the mucous membrane of the vagina forms a broad fold, which is directed forwards and lies immediately over the urethral opening : the length of this fold in the adult mare is about eight inches, and, near its middle, it is upwards of an inch in breadth. The urinary bladder is small in comparison with the size of the animal ; its shape is nearly round; and its circumference, when moderately distended, about a foot and a half. The urethra is remarkably short and capacious, the circum- ference of its canal being about three inches, while its leng
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