SALMO SALA.R. 413 



ward with the upper end of the sound. The upper half is divided 

 into two, but at the lower end they are united into one ; and these have 

 but one large ureter, which opens into the bladder at its neck: the 

 urethra opens close to the anus just behind it. 



There is fat 1 about the stomach and intestines, but none on the 

 liver. 



The Salmon \_Salmo Salar, Linn.]. 



The intestine first goes a little way in the direction of the last part of 

 the stomach ; it then bends down towards the tail, which is continued 

 to the anus in a straight line, and about half-way down it becomes a 

 little larger. The villous coat at the small part is in small plicse : 

 before it becomes larger, there are small valvular parts ; and just where 

 it becomes larger, there is a large one like a pylorus, projecting down- 

 wards; from thence downwards there are smaller folds, which are 

 continued to near the anus 2 . There is a large gall-bladder, the duct of 

 which is large and like the ? . The hepatic duct has 



branches going into it, as it passes along a sulcus of the liver ; besides 

 which there is a distinct hepatic duct which comes from the liver which 

 is very small, and becomes large just at the duodenum, and enters with 

 the other duct by a very small orifice 3 . The urinary bladder is long 

 and small, behind the rectum. The ureters join into one, which enters 

 the bladder at the fundus. That part which may be called urethra, 

 which is a continuation of the bladder, has a number of veins forming 

 a plexus ; it opens behind the anus or at the posterior verge of the 

 anus. The sound has a mucus in it like that in the stomach, and 

 it opens into the oesophagus. The veins of the sound open into, or 

 anastomose with, the vena portarum. 



There is a large vessel anastomosing with the vas deferens from the 

 testicle, towards the anus, which I suppose to be a lymphatic vessel, 

 arising from the testicle 4 . 



The brim of the orbit of a salmon, or the termination of the external 

 surface of the head, is a thin semi-transparent cartilaginous edge ; 

 under which the outer parts of the eye roll ; this is different from some 

 other fishes. The internal surface of this is not united to the edge. 

 The sclerotic coat is pretty thick, thicker anteriorly than posteriorly. 

 There are two choroid coats, the external one thin and of a silver 

 colour ; the other thicker and black. It is divided near the optic nerve 



' [Hunt. Prep. Phys. Series, No. 1803.] 2 [lb. No. 635.] 



3 [lb. No. 773, showing the pancreas.] 



* [lb. No. 2392 ; the female organs are Nos. 3203, 3204.] 



