46 MR. R. I. POCOCK OX THE EXTERNAL 



In Galago crassicatidattts and monteiri (text-fig. 13, A-C) the 

 penis differs considerably from that of G. senegalensis. It is 

 clavate in form, being grachudly incrassate from the base to the 

 bhnited tip. The orifice is just below the ;ipex of the baculum, 

 and the two are encircled by a frill of grooved, wrinkled epithe- 

 lium, forming a sort of secondary prepuce, which is attached by a 

 frenum to the lower lip of the orifice and encloses a glandular 

 space. The spines covering the penis ai-e bidentate or tridentate, 

 and much smaller than in G. senegalensis. The baculum (text- 

 fig. 14, E), although actually longer than in G. senegalensis, is 

 approximately the same shape and relatively about the same size. 

 In Nycticebus the penis (text-fig. 13, F, G) is much shorter than 

 in Galago and smooth and of tolei-ably even thickness through- 

 out. The callous pad at the tip of the baculum is large, rounded 

 and prominent, and overhangs the orifice of the urethra, which 

 lies in a glandvdar space bounded laterally and below by a pair 

 of labia practically as in G. senegalensis. The baculum (text- 

 fig. 14, F) is a nearly straight rod, only about two-thirds the 

 length of that of G. senegalensis, although the animal itself is 

 much bigger. 



In Perodicticus the penis (text-fig. 13, H) is short and smooth 

 and like that of Nycticebus except that the tip of the baculum 

 and the orifice of the urethra are surrounded by a complete hood 

 or frill of wrinkled epithelium enclosing a circular glandular 

 space. The baculum (text-fig. 14, G) in the specimen examined 

 is shorter than that of the example of Nycticebus, but decidedly 

 thicker at the base inferiorly and with its upper edge a little 

 more sinuous. 



According to Huxley s description (P. Z. S. 1864, p. 334) the 

 extremity of the glans penis in Arctocebtts closely resembles that 

 of Perodicticus except that the encircling hood is bifid in the 

 middle line below. He states, however, that the baculum is "75 

 of an inch in length, about twice as long, that is to say, as in my 

 example of Perodicticus, although, judging from the dimensions 

 of the limbs, his animal was considerably the smaller of the two. 

 In Chiromys the penis is rugulose, wrinkled, and very slightly 

 narrowed distally for three-fourths of its length, then somewhat 

 abruptly attenuated to the apex, where the upturned tip of the 

 baculum terminates; but just below this point there is a little 

 soft, curved, subcylindrical process upon which it seems probable 

 the orifice of the urethra, opens. When the prepuce is reflected 

 to its fullest extent, the basal fourth of the exposed portion of the 

 penis is seen to be provided with five probably glandular, longi- 

 tudinal grooves, one in the middle line above and two on each 

 side, one above the other, the ventral middle line being occupied 

 by the frenum. The baculum (text-fig. 14, 1 ) is tolerably stout and 

 longer than in any genus of Lemuroid known to me. Allowing for 

 its curvature, it is as long relatively as in Galago crassicaudatus. 

 When seen from the side it is markedly sinuous, its upper edge 



