GAB us. 



333 



The heart lies in the former and the alimentary canal and other organs 

 in the latter. The somatic layer of peritoneum is deeply 

 Alimentary, pigmented, forming a black wall to the cavity, whilst the 

 splanchnic forms a glistening transparent membrane sur- 

 rounding the alimentary canal and forming a dorsal mesentery. 



The teeth have already been mentioned : they are borne on the pre- 

 maxilla and dentary and a small inner patch on the vomer {cf. Frog). 

 If the jaws be pulled open and the pharynx examined, the five lateral 

 gill-clefts can be noticed and in addition a large paired patch of teeth on 

 its dorsal surface, borne on the superior pharyngeal bones or upper 

 bones of the branchial arch. Inmiediately ventral to these are a pair 

 of patches of teeth on the inferior pharyngeal bones, representing the 



Fig. 236. — Dissection of Haddock from the Left Side. [Adnat.) 



Liver. 



Closed Duct of Air-bladder, 

 Kidney. 



Body-wall. 



Air-bladder. 



Kidney. 



1 Trinary 

 I Bladder. 

 I Ureter. 

 Genital Aperture. 



Pyloric Stomach. Liver. Spleen. 

 Caeca. 



The left abdominal wall has been cut and thrown back dorsally, and the intestine and 

 stomach have been pulled out ventrally. 



fifth branchial arches. These teeth, working upon each other, form a re- 

 markable subsidiary pair of jaws for propelling food down the (esophagus 

 into the stomach. In all cases the teeth are mexeXy haplodo7tt, i.e., they 

 are sharp conical points which sieze prey but are not used for mastication. 

 The stoffiach is large and bent on itself. It is continued into a dtiodenum, 

 at the commencement of which there opens a number of long csecal tubes 

 called the pyloric cceca. They are said to secrete a digestive juice and 

 have been compared tentatively to a pancreas. The liver is a large bi- 

 lobed organ with a gall-bladder from which there passes a single bile- 

 duct to open into the duodenum. The duodenum is continued into the 

 ileum which is long and coiled and terminates in the anus. Its hind 



