DE. J. MUKIE ON THE ANATOMY OF THE SEA-LION. 569 



c. The Ureters and Bladder. — As the former leave the kidneys they present a wide 

 dilatation ; but they narrow considerably at a short distance from their origin, and 

 then, retaining the diameter of a goose-quill, enter the base of the urinary bladder a 

 little way behind the neck, an inch apart from each other. Having penetrated the 

 serous and muscular coats of the bladder, they continue within its walls for about three 

 quarters of an inch, and, converging, open by narrow apertures, 0*2 inch separate, at 

 the uvula vesicae, immediately posterior to the prostatic portion of the urethra. 



The urinary bladder is elongated and pyriform, the neck, however, being short. 

 The serous, muscular, and mucous coats are of but moderate thickness. Of its liga- 

 ments I noted that the remains of urachus and hypogastric arteries obtain below the 

 tip of the fundus. At the neck, just behind the prostate, a distinct strong median band 

 of glistening tissue represents the anterior ligament. The lateral ligaments, broad 

 and thin, reach from the neck to the fundus; and, furthermore, there is present an 

 anterior vesical fascial layer. 



2. The Organs of Generation. 



a. Urethra and Penis. — The prostatic portion of the urethra is fully an inch long 

 and narrow ; the mucous membrane, thrown into narrow longitudinal folds, has the 

 median inferior one most elevated. The caput gallinaginis or veru montanum is 

 distinctly marked, though of small size, and is situated anterior to the middle of the 

 prostate gland. On either side are slight depressions, the prostatic sinuses, in which 

 minute puncta indicate the orifices of the said gland. The membranous portion of the 

 urethra is slightly wider and more dilatable than the prostatic portion ; but its mucous 

 folds resemble the latter. Its length is fully two inches. 



The penis, which is enclosed in a loose subcutaneous sheath, measures in the con- 

 tracted condition about eight and a half inches from its symphysial root to the tip of 

 the glans. It lies adherent along the median line of the abdomen, the external opening 

 being eight inches distant from the anus. The suspensory ligaments are two short fibro- 

 tendinous cords attached to the pubic arch, and inserted on each side of the upper surface 

 of the middle of the enlarged bulb. The strong crura, firmly fixed to both sides of the 

 ischial arch, swell out as they go to form the deep enlarged bulb of the corpora cavernosa. 

 The bulb, with its investing muscles, measures 1\ inch in vertical depth, and rather over 

 that in length. Beyond the bulb the conjoined corpora cavernosa, or body of the penis, 

 is round, and about the thickness of one's little finger ; this diameter is continued to the 

 proximal end of the bone, a distance of between two and three inches. From this point 

 the united cavernous body diminishes considerably, and is partially lost in the fibro- 

 vascular membrane investing the os penis. 



There is no prominent corpus spongiosum, the urethral canal passing beneath the 

 cavernous bodies, being embraced and almost hidden by them. It opens as the meatus 

 urinarius at the front and lower end of the glans, immediately below the bone. The 



