44-0 DR. J. ANDERSON ON THE CLOACAL BLADDERS 



rupture the inner linings by too strong pi-essure, whilst at the 

 same time I fully distended them. 



1st experiment. — This was made on a male of Geoemyda grandis. 

 The fluid, injected into the peritoneal canal from about the upper 

 third of the length of the penis, flowed freely through it, appear- 

 ing at an opening situated immediately at the base of the glans 

 and close to the inside of the genito-urinal groove. Eepeated 

 slight pressure was exercised on the dilated canal, and then the 

 corpus cavernosum of its side was laid open to ascertain if any fluid 

 had passed into it ; but whilst the interior of the peritoneal canal 

 was richly coloured with the carmine, no trace of colour could 

 be detected in the corpus cavernosum. At the point where the 

 canal terminated externally there were indications of an orifice 

 even before the injection was applied, in the absence of pigment 

 at that point ; but I failed to detect any communication between 

 the peritoneal canal and the corpus cavernosum. 



2nd experiment. — In a male Emys Hamiltonii the coloured 

 injection appeared like a jet from a fine artery, issuing from a 

 very minute orifice in the same position as the orifice of Geo- 

 emyda grandis ; and no trace of carmine could be observed in the 

 corpus cavernosum, or the presence of any orifice leading from 

 one canal to the other. 



'6rd experiment. — In a male specimen of Trionyx ocellatus, in 

 which the penis was very flaccid, the orifices of the peritoneal 

 canals are wide orifices situated more anterior to the base of the 

 glans than in Emys and Geoemyda, and more on the side of the 

 penis, further away from the urino-genital groove. The mixture 

 flowed through them in a great stream, the penis being that of a 

 much larger animal than any Geoemyda. No trace of injection 

 could be found in the corpus cavernosum of the side injected ; nor 

 could any orifices be detected, even with the aid of a pocket-lens, 

 between the pei'itoneal and the corpus cavernosum of the opposite 

 side when they were laid open to near the termination, nor in any 

 other portion of their walls. Moreover, when the corpora caver- 

 nosa were injected, no trace of carmine appeared in the peritoneal 

 canals, or at the tips of the lobes of the glans, which are white, 

 and form the termination of the branches of the urino-genital 

 groove. 



4itJi experiment. — In a female of Trionyx gangeticus the coloured 

 injection passed at once through the peritoneal canal, appearing 

 at a spot situated some little distance above the base of the glans 



