418 DR. M. WATSON ON THE MALE [Apr. 16, 



clothed with down of a lightish colour. The down at the external 

 angles of the pouch is longer than elsewhere, and forms two tufts 

 which project into the pouch. Opening into the bottom of each 

 extremity of this pouch is the duct of an anal gland ; whilst extending 

 between these larger apertures is a belt of small perforations, which 

 indicate the ducts of a number of small isolated follicles lying in 

 relation to the fundus of the pouch. 



Nipple. — Upon either side of the middle line, and half an inch 

 external to the free portion of the penis, is a single rudimentary 

 nipple. It measures one eighth of an inch in height, and lies con- 

 cealed in the thick hair of this region. 



Internal Organs. 



Rectum and Anal Glands. — The rectum occupies the usual posi- 

 tion in the pelvis, and is provided with walls of unusual thickness, 

 the external or longitudinal muscular bundles being particularly well 

 developed. It is attached to the lower surface of the sacrum by a 

 double fold of peritoneum or meso-rectum, which measures between 

 two and three inches in breadth, and consequently allows of consi- 

 derable movement of the rectum within the cavity of the pelvis. 

 The terminal portion of the rectum is surrounded by two muscles, 

 the levator and sphincter ani. 1 . The levator ani is of considerable 

 strength, and arises from the fascia lining the pelvis. Its fibres pass 

 backward and upward, aud terminate on the walls of the rectum 

 under cover of the sphincter ani. 2. The sphincter ani is very 

 powerful, and arises from the under surface of that caudal vertebra 

 which is situated directly above the anus, its origin being interposed 

 between those of the depressors of the tail. The muscle is two 

 inches in breadth, and invests not only the extremity of the rectum 

 but also the anal glands together with the pouch into which these 

 open. It is inserted into the skin midway between the anus and 

 scrotum. By means of this arrangement the sphincter ani acts not 

 only as such upon the anus and anal-gland pouch, but also as a com- 

 pressor of the anal glands. The gland-pouch resembles the corre- 

 sponding structure in the female, being transversely oval in form. 

 The anal glands are two in number, one being placed on each side of 

 the rectum. They are oval in form and nodulated on the surface. 

 Each measures 1 1 inch in length and | inch in greatest breadth . 

 They are thus considerably smaller than the corresponding glands in 

 the female, in which they measure 2| inches in length and 1 h inch 

 in breadth. The gland consists of a secreting wall g inch in thick- 

 ness, which limits a central cavity. From the posterior extremity of 

 this cavity a duct passes off and opens into the corresponding angle 

 of the anal pouch. The cavity of the gland was filled with a thick 

 secretion, which differed from that of the female in being of a 

 blackish colour and in being destitute of the very offensive odour 

 characteristic of that sex. In addition to these larger glands a belt 

 of isolated follicles extends across the bottom of the anal pouch. 

 They pour their secretion into the latter by means of the little aper- 

 tures above described. 



