744 



MR. R. I. rOCOCK ON 



cannot be included in the category of" secondary sexual clia- 

 ractei's, although their scent may enable individuals of 

 Orycterojnis to find one another ; and since these animals are . 

 otherwise unprovided with means of self-defence, I suspect that 

 the secretion of the glands is protective like those of the anal 

 glands of Mephitis and llusiela, which it resembles in odour. 



Text-fie'ure 2. 



The preputial gland of Sus serofa. 



A. The gland dissected from the veijtral side, the flaps of abdominal integument 



and of the sheath of the penis turned aside. The glans penis also turned 

 aside to show the orifice of the gland in the prepuce. 



B. Lateral view of the same, partly diagrammatic. 



C. Transverse section through the sac of the gland showing its extension above the 



penis. 

 J5,, penis ; pv.. prepuce ; o., orifice of gland ; s., sac of gland ; sli., cut edge 

 of sheath of penis ; sic., cut edge of skin of abdomen. 



