1877.] ANATOMY OF H\\ENA CKOCUTA. 371 



of the depression being covered with hair of the same colour as the 

 surrounding parts. In this depression are situated two apertures, 

 that of the anus, and that of the anal-gland pouch, the latter being 

 situated between the former and the root of the tail. The lower mar- 

 gin of the anus is placed an inch above the scrotal pouches, the skin 

 between tbem being black. The anus is separated by a transverse 

 fold of integument from the anal-gland pouch. The skin of the 

 latter is smooth and devoid of hair, with the exception of three small 

 tufts, one of which springs from the middle of the upper wall of the 

 pouch, and one from each of its inferior external angles. At the 

 bottom of the pouch, on either side of the middle line, is a single 

 aperture of sufficient size to admit a quill. These are the openings 

 of the ducts of two large anal glands ; and stretching across the 

 bottom of the pouch from one of these openings to the other is a 

 transverse line of perforations which correspond to the excretory 

 ducts of a number of small isolated glandules to be subsequently 

 described. 



Having now described the appearances of the external parts, I 

 pass on to the description of the 



Internal Organs. 



Rectum and Anal Glands. — The walls of the rectum aye thick, 

 being provided with a strong layer of longitudinally arranged muscular 

 fibres. It has the usual relation to neighbouring viscera, and ter- 

 minates immediately below the pouch which receives the excretory 

 ducts of the anal glands. This pouch has a transversely oval form, 

 is 2^ inches in breadth, and is depressed from the level of the peri- 

 neum to the depth of If inch. The anal glands which pour their 

 secretion into it are two in number ; but in addition to these there is 

 a belt of isolated glandular follicles which extends across the bottom 

 of the pouch. Each anal gland is situated above and to the outer 

 side of the rectum, and has, when denuded of the surrounding con- 

 nective tissue, a botryoidal appearance, by reason of the presence 

 of a number of little grape-like projections on its surface. Each is 

 roughly pyriform, and has the" apex directed forward and upward, 

 the base backward and downward. The inner side of each gland is 

 applied to the corresponding angle of the anal pouch ; and from this 

 surface of the gland the duct is given off to open into the pouch as 

 previously described. Each of the glands measures 2f inches from 

 base to apex, and 1| inch in diameter at the base. When cut 

 open, each is seen to consist of a thick glandular wall, enclosing 

 a single cavity of large size which communicates by means of the 

 opening already described with the anal-gland pouch. The cavity 

 of the gland was filled with a thick yellowish secretion, evidently 

 the product of the glandular walls, of the consistence of butter, and 

 having a very offensive smell. A quantity of muscular fibres ap- 

 parently continuous with those of the sphincter ani surrounds each 

 gland, and evidently acts as a compressor. The belt of glandular 

 follicles above referred to as extending across the bottom of the anal- 

 gland pouch, consists of a large number of isolated glands, each about 



24* 



