50 PROF. OWEN ON THE ANATOMY OF THE INDIAN RHINOCEROS. 



situated two large subcompressed oval Cowperian glands {lb., c, c). Each of these 

 measures three inches and a half by two inches and a half. The structure of the corpus 

 cavernosum resembles that of the Horse. 



The great plexus of veins above the dorsum penis near its root, was enveloped in a 

 mass of elastic tissue, like the ' dartos' of the human scrotum. 



The fleshy part of the ' levatores penis' (PI. XVII. II) measures fourteen inches in length, 

 five inches across their basal origin, and between one and two inches in thickness. 

 Their obUque origin is extended over the space of one foot from the ento-pelvic part of 

 the pubis down to the ischium. The tendinous part of the muscle commences where 

 the pubic portion joins the ischial portion of the muscle at the inner and under border 

 of the fleshy part : it is half an inch thick at its commencement, but expands as it ex- 

 tends along the muscle, the fleshy fasciculi of which are inserted into the tendon in an 

 obliquely converging, or semi-penniform manner. As the tendon augments in breadth, 

 it diminishes in thickness, converging towards its fellow, which it meets and joins two 

 inches before the anterior termination of the fleshy portion. The two united flattened 

 tendons beyond are gradually converted into a round chord of ligamentous substance an 

 inch in diameter. This chord {lb. I') glides through a strong, slightly elastic aponeurotic 

 sheath along the median groove of the dorsum penis ; it is connected with the inner 

 surface of the sheath by a highly elastic cellular tissue ; the chord maintains its ropeUke 

 character along the basal third of the glans {lb. f), then subsides, expanding laterally, 

 and is finally lost upon the firm capsule of the glans. There is no ' os penis. ' 



The nerves of the dorsum penis, the arteries, and trunks of two large plexuses of 

 veins, pass beneath the bridge formed by the confluence of the tendinous and muscular 

 parts of the ' levatores penis' and between the two suspensory ligaments of the penis. 

 These ligaments are an inch in breadth, and one-third of an inch in thickness at their 

 origin from the ischio-pubic arch a little in advance of the ligamentous attachments of 

 the crura corporis cavernosi. 



The total length of the undistended penis is three feet nine inches ; the circumference 

 of the prepuce is one foot five inches. 



The external and constantly exposed firmer tegumentary part of the prepuce has been 

 already described, and is figured in PI. IX. fig. 4. 



The substance of the large reflected preputial fold of softer integument (PI. IX. fig. 5, 

 and Fl. XVII. fig. i, pr) is from half an inch to two-thirds of an inch in thickness, and 

 consists of a moderately compact cellular corium, with a delicate epiderm, minutely rugose 

 in the transverse direction, and perforate or punctate with the pores of the mucous 

 follicles which are very regularly dispersed at intervals of about a quarter of an inch. 



The glans penis {lb. ib. yl) is a long and slender subcompressed cone with a truncate 

 apex ; it measured in its flaccid undistended state, one foot in length : the prepuce is 

 reflected upon its base at the same transverse or circular line, and there is no fraenum. 

 The apex (PI. IX. figs. 5 & 6, and PI. XVII. figs. 1, 2 & 3, a) is not simple, but resembles 



