1901.] ANATOMY OF COGIA 15REVICEPS. 125 



This forked character of the c. spongiosum in Cogia is readily 

 seen both in transverse sections and horizontal sections. So far 

 as I have been able to find out from textbooks, the Kangaroo (and 

 perhaps some other Marsupials) presents a similar condition 

 (according to Owen). In Cetacea no mentiou is made of the phe- 

 nomena, and generally a " bulb " is described and figured, as in the 

 majority of mammals. 



It is, of course, in this basal region that the urethra enters the 

 penis, and in the general disposition of parts Cogia is quite 

 typical. The thick-walled, muscular urethra passes obliquely back- 

 wards and downwards towards the angle formed by the crura 

 penis ; it dilates to form the thin-walled hulbus ureihrce, and here 

 the angulation of the tube occurs : it then enters the c. spongiosum, 

 through which it runs, slightly to the right side. 



The prostate gland in Cogia agrees very closely with the account 

 given by previous authors (e. g. Turner, 15) for other Whales ; 

 it is a loose glandular and vascular tissue surrounding the lower 

 half of the bulbus uretlme. Above the gland is a circular muscle, 

 the "compressor prostata? " or L 'comp. urethra." (PI. XI. figs. 24, 

 25, C.u.) 



The seminal ducts deserve a few words. For a considerable part 

 of their lower portion, each duct takes a straight course, as a wide, 

 thin-walled tube ; the internal lining of which is raised into a 

 series of imperfectly transverse, thin membranous valves (PI. XI. 

 fig. 21). They do not form a continuous spiral, as they do in the 

 Eorqual and the Dolphin, according to Beauregard and Boulart (1), 

 who compare the arrangement to the well-known spiral valve of the 

 Elasmobranch intestine. 



Below the valves, for a distance of about an inch and a half, the 

 mucous membrane is thrown into a number of very fine, lamellose, 

 longitudinal ridges, which continue almost to the entrance of the 

 sperm duct into the urethra. 



The verwmontanum (PL XL fig. 22) is a long, narrow, but well- 

 marked ridge, fading out anteriorly, and higher and broader 

 posteriorly. At this point, on the posterior ventral wall of the 

 " bulbus urethra," is a transversely oval aperture (a) situated on a 

 slight, rounded prominence. This aperture, which has a rounded 

 margin, leads into a shallow, but well-marked pit, into which, right 

 and left, the seminal ducts open by slightly curved slit-like pores, 

 guarded by distinct and whitish lips. These pores are quite below 

 the general level of the mucous membrane, and between them is a 

 very slight recess, in the substance of the urethral wall, which no 

 doubt represents the uterus maseuUmu (cf. Beauregard and 

 Boulart). 



The pores of the prostate gland CP1. XJ. fig. 22, Pro.) open behind 

 this oval aperture ; on each side of which, and behind it, a number 

 of delicate transversely dispersed ridges or lamella- occur. Most 

 of the prostate poxes are placed bet ween the outer ends of neigh- 

 bouring ridges : four on the left side, three on the right, but two 

 others on this side are at a different level, and lie at the side of 



