1881.] NATURAL SCIENCES OF PHILADELPHIA. 139 



will be seen from the aboA^e that the genito-urinaiy apparatus in 

 the male Hippopotamus have not been figured, and that of the 

 female onl}^ imperfectl}' so, while the description of Alix is based 

 on very young animals, and that of Clark is limited to the female 

 sex. I trust that the following brief description of the parts as 

 I found them in the male and female, with the accompanying 

 figures will sufficiently illustrate what is wanting in the accounts 

 hitherto given of the animal. 



Genito- TJjnnary Organs in Male. — The kidneys, k (Plate XIV), 

 measured five inches in length and were distinctly lobulated. 

 About ten of these lobules could be counted on each face. The 

 ureters were 7 inches in length, and opened into the bladder at 

 the angles of the trigonum vesicfe. The bladder, 6, from the 

 highest point to the verumontanum in the middle line measured 

 9 inches. There was no sign of a prostate gland or utriculus. 

 On each side, however, of the middle line below the verumontanum 

 a number of little follicles could be observed. The Cowperian 

 glands, c, on the other hand, are xevy large, being almost an inch 

 in diameter ; the main duct was well developed and opened into 

 the urethra an inch below the gland. A considerable amount of a 

 viscous humor could be squeezed out of the gland and duct. The 

 muscular fibres covering the gland no doubt produce this effect in 

 contracting. The distance from the verumontanum to the orifices 

 of the Cowper's ducts measured four inches. The orifices of the 

 ducts were concealed by a little fold of mucous membrane. Under 

 this fold the membrane was thrown into delicate transverse ridges. 

 The mucous membrane of the membranous portion of the urethra 

 was thrown into longitudinal folds. The urethra from the open- 

 ings of Cowper's ducts to its termination in the glans measured 

 12 inches. There was nothing exceptional in reference to the 

 corpus spongiosum or the corpora cavernosa. The penis meas- 

 ured in circumference 2 inches. The ischio cavernous and bulbo 

 urethral muscles were well developed. The sj-mmetricall}' disposed 

 retractor muscles, etc., of the penis arising from the posterior 

 surface of the rectum pass to the bulbous portion of the urethra, 

 where, becoming tendinous, they are continued side b}' side to the 

 base of the glans into which they are inserted. The glans itself 

 measured in circumference b\ inches, and when eA'erted presents 

 a veiy peculiar appearance, it being then thrown into a rosette 

 which consists of folds arranged somewhat like the leaves of a 



