592 



CETACEA. 



Fig. 277. 



Mak Organs of a Porpesse. 



emerge from it, and becoming a distinct spongy 

 body, runs along its under surface, as in qua- 

 drupeds (A). The corpus cavernosum in some 

 is broader from the upper part to the lower 

 ,than from side to side; but in the Porpoise 

 ~ (jig- 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 



Fig. 278. 



good way further on, and 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 vertebrae 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, Jig. 

 278) is surrounded by a muscle of prodigious 

 thickness ( /c, k), destined to compress and 

 forcibly expel the contents of that part of the 

 canal. 



The acceleratores muscles (I) are likewise 

 very strong ; and there is a pair of strong and 

 long muscles (m, Jig. 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. 



The female organs in the Phytophagous 

 Cetacea have been described by Steller as 

 they exist in the Rytina, and by Home in 

 the Dugong; the latter author has given a 

 figure of the uterus with part of the vagina : 

 (see fig. 279.) In both species the vagina (a) 

 is characterized by the longitudinal rugae of 

 its inner surface. The body of the uterus (c) 

 commences by a single os tincae (6) in the 



Fig. 279. 



Mule Organs of a Dolphin. 



Uterus of the Ditgong. 



Dugong, and gives off the cornua uteri (d, d) 

 at right angles.* The structure of the Fallo- 

 pian tubes and ovaries is not described. Steller 

 states that in the llytina they resemble those of 

 the Mare. The vulva he describes as of a tri- 

 angular form, with the clitoris, which is of a 

 gristly texture, and an inch and a half long, 



* See Home, in Phil. Trans. 1820, p. 321. 



