ORGANS OF GEN ERATION.—The organs con cerned in the reproduction of the species do not exhibit the same type of conformation in the Phytophagous as the Zoophagous species. In the former the mammze are pectoral, in the latter inguinal or rather pudendal, since they are situated on each side of the vulva : in both orders their number never exceeds two. The vulva, which resembles in its form that of the Ruminants, presents nothing peculiar in its structure.
The penis is attached to the rudimental bones of the pelvis; in the Phytophaga the glans is complicated, but in the Zoophaga it is of a simple elongated fusiform shape : in all the species it is provided with a prepuce.
[According to Hunter, the parts of generation in both sexes of this order of animals come nearer in form to those of the Ruminants than of any others; and this similarity is, perhaps, more remarkable in the female than in the male; for their situation in the male must vary on account of the modification of the external form of the body.
The testicles (a, adigs. 277, 278) retain the situation in which they were formed, as in those quadrupeds in which they never come down into the scrotum. They are situated near the lower part of the abdomen, one on each side, upon the two great depressors of the tail. At this part of the abdomen, the testicles come in contact with the abdominal muscles anteriorly.
The vasa deferentia (c, c) pass directly from the epididymis (b, b) behind the bladder (d, d) or between it and the rectum (c) into the urethra (f) ; and there are no bags similar to those called vesicul seininales in certain other animals.
The structure of the penis is nearly the same in them all, and formed flinch upon the same principle as in the quadruped. It is made up of two crura (g, g), uniting into one corpus cavernosum, and the corpus spongiosum seems first to enter the corpus cavernosum. In the Porpoise, at least, the urethra is found nearly in the centre of the corpus cavernosum ; but towards the glans seems to separate or emerge from it, and becoming a distinct spongy body, runs along its under surface, as in qua drupeds (h). The corpus cavernosum in some
is broader from the upper part to the lower than from side to side; but in the Porpoise (fig. 277) it has the appearance of being round, becoming smaller forwards, so as to terminate almost in a point some distance from the end of the penis. The glans does not spread out as in many quadrupeds, but seems to be merely a plexus of veins covering the anterior end of the penis, yet is extended a good way further on, arid is in some not more than one vein deep.
The crura penis are attached to two bones, which are nearly in the same situation and in the same part of the pelvis as those to which the penis is attached in quadrupeds; but these bones are only for the insertion of the crura, and not for the support of any other part, like the pelvis in those animals which have poste rior extremities, neither do they meet at the fore part, or join the vertebrw of the back.
The erectores penis (g, g, fig. 277) are very strong muscles, having an origin and insertion similar to those of the human subject.
The prostatic portion of the urethra (f, fig. 278) is surrounded by a muscle of prodigious thickness (k, k), destined to compress and forcibly expel the contents of that part of the canal.
The acceleratores muscles (/) are likewise very strong; and there is a pair of strong and long muscles (m, fig. 277) arising from the anus, and passing forwards to the bulb of the penis, that run along the under surface of the urethra, and are at last lost or inserted in the corpus spongiosum. These muscles draw the penis into the prepuce and throw that part of the penis that is behind its insertion into a serpentine form. These muscles are common to most animals that draw back the penis into what is called the sheath, and may be called the retractores penis.