870i TBE GENERATIVE AFPABATUS. 



by Lacauohie. (When flaccid, the penis of the Fig is twisted in a spiral manner at the 

 extremity. The sheath is narrow, and longer than in Ruminants. At the upper part of 

 its opening is the special poucli mentioned by Chauveau, and which is formed by a fold 

 uf the skin It opens into the sheath, and secretes, in the Boar, an unctuous fluid, 

 possessing a particularly disagreeable smell, and which is mixed with the urine. The 

 odour of the secretion even taints the flesh of this creature.) 



Caknivoka. — The testicles of the Gat are formed like, and placed in the same situation 

 as, those of the Pig ; those of the Dog are more oval, and are pendent. 



The Carnivora have no vesiculie seminales. The prostate gland surrounds the neck 

 of the bladder ; it is of a yellow colour, concave on its upper surface, and divided into 

 two lateral lobes on its lower face. Cowper's glands are absent in the Dog ; they exist in 

 the Cat (in which they are very small, and excrete their secretion by separate efferent 

 canals). The urethra (in its pelvic portion) is very long; towards the ischial arch it 

 shows an enlargement or bulb, though this is less, proportionately, than in the Ox ; the 

 accelerator muscle is continued -for a longer distance around it. (The spongy portion ia 

 thinner in the Gat than the Dog.) 



" In the Dog, the penis is long and pointed. The posterior half is constituted by the 

 corpus cavernosum, which is little developed, and has not a complete middle septum. 

 The anterior moiety has for its base a bone, found in several other mammifers, which 

 is intended to favour the introduction of the penis into the genital organs of the female. 



" The penien, or penial, bone is elongated, conical, and iucurvated, so as to constitute 

 a furrow interiorly, in wliich is lodged the urethra when it leaves the fibr >uS channel of 

 the corpus cavernosum ; its apex, anteriorly, partly forms the point of the j^enis ; its base 

 is intimately united to the anterior portion of the corpus cavernosum : the median 

 septum, which is very dense, is iised in this bone, as is the fibrous envelope which mixes 

 with its periosteum. 



" The penial bone almost entirely constitutes the base of all that portion of the penis 

 included within the sheath ; in addition, this part possesses two distinct erectile enlarge- 

 ments — an anterior and posterior. The first is analogous to that of the glans penis of the 

 Horse, and is formed by an expansion of the erectile tissue of the urethra ; club-haped 

 at its anterior base, it has there a point suddenly bent downwards, beneath which is 

 pierced the urethral orifice ; posteriorly it is thin, and partially covers the other erectile 

 mass. The latter is supplementary ; it begins at the base of the free portion of the 

 penis, where the integument of the sheath is folded in a circular manner around it. 

 From 1 to 1 J inclies long, it embraces the upper border and sides of the bone ; pyramidal 

 in shape, its base, which is posterior, is f to IJ inches thick ; in front, it thins away beneath 

 the erectile tissue of the head. 



" Such are the two erectile masses, whose summits overlap, so that the free portion of the 

 penis, bulging in front, and still more so behind, is narrowest in the middle. Although 

 contiguous, these two vascular dilatations are independent of each other ; the posterior 

 has, likewise, no communication with the corpus cavernosum, and possesses two parti- 

 cular veins which pass backward in a lateral groove. Each is erected separately during 

 copulation, when they assume a large size ; the great volume of the posterior enlarge- 

 ment prolongs the duration of this act, until flaooidity ensues. This peculiarity is a 

 consequence of the absence of the seminal reservoirs (the vesiculiB seminales). 



"In the Dog, two small muscles are found which appear to be destined to elevate the 



-, penis and direct it during its introduction into the sexual parts of the female as its 



erection is always feeble. These are two fasciculi which proceed from the crura 'of the 



penis, and pass forward to unite in a common tendon implanted on the dorsal border of 



■ the organ ; they thus resemble the chord of an arc. 



"The subpenial muscular cords exist as in the other animals. The sheath is narrow 

 and long, and, as m the didactyles, h.a,i protractor muscles; tlie integument is thin and 

 rose-coloured, like that covering the free portion of the penis 



. . " {? t^e Cai, the penis is short, and directed backwards ; but in a state of erection it 

 IS inclined forwards for copulation. Its free portion presents some peculiarities It is 

 conical, and its summit, near which is pierced the urethral opening, has for its basis a 

 small incomplete pemal bone, that encloses a layer of erectile tissue-an expa.nsion of 

 that of the uretlua. This free portion is covered by an integument studded with some- 

 what rigid papillae directed backwards, and capable of being made erect diX- 

 copulation. These points, wlach are met with in nearly all the Cat kind, are analogous 

 to the hairs, scales, strong spmes, and even the cartilaginous saws of certain other 

 :S^'^rSs:^^l Sl.'^ '^ "'^*^' ^° ^'^ '"^^'^ '' sensitiv:r/oTtt\taS 



