480 



ANATOMY OE VEHTEBKATES. 



is no gall-bladder. The hepatic duct, fig. 366, /, g, is wide and 

 very long : it has a reticulate inner surface : it expands, between 

 the coats of the duodenum, into an oval receptacle, ib. o, irregu- 

 larly divided into compartments : the first pancreatic duct, ib. I, 

 also pours its secretion into this receptacle, which contracts and 

 is surrounded by a sphincter of the circular layer of fibres, before 

 penetrating the muscular coat, which here protrudes, as a 

 mammillary eminence, traversed by the probe, q, r. 



In a female Giraffe I found a large gall-bladder, bifid at its 



366 



Terminal bile-pouch, Elephant. 



Double gall-bladder of a Giraffe 



fundus. It was attached in the usual position to the under part 

 of the undivided liver, having a covering of peritoneum over 

 three-fourths of its surface. It was divided throughout its length 

 by a middle vertical septum, fig. 367. The lining membrane of 

 each chamber was smooth ; they communicated with the com- 

 mencement of a single cystic duct, the terminal orifices admitting 

 freely the blunt end of a common probe and being protected by 

 a valvular fold. In two males, subsequently dissected, there 

 was not a vestige of a gall-bladder, but the bile was conveyed 



