430 



ANATOMY OF VERTEBRATES. 



287 



of the duodenum of the Eel, for example) of the ordinary tract 

 of the alimentary canal, render unnecessary the presence of a 



pancreas. Thus there is 

 no caecal production of the 

 duodenum in the Ambas- 

 sis, Wolf-fish, Warty Agrio- 

 pe, nor in most Labroids, 

 Cyprinoids, Lucioids, Silur- 

 oids, nor in the apodal Mala- 

 copteri, nor in the Lopho- 

 branchs and Plectognats ; nor 

 in the genera Antennarius, 

 Malth&us, and Batrachus. 

 The pancreas is represented 

 by a single pyloric caecum 

 in the Sandlance and Poly- 

 pterus, fig. 279, k: by two 

 caeca in most Labyrinthi- 

 branchs, in many species of 

 Amphiprion, in the Lophius, 

 the Turbot, fig. 287, and 

 the Mormyrus, fig. 280, k : 



Pyloric caeca of the Turbot (Rhombus maximus). ccxxxi. , , . ' 



by three caeca in the Perch, 



the percoid Popes (Acerina), the Asprodes, and Diploprions : of 

 from four to nine caeca in the genus Cottus : of from five to nine 



caeca in the ffenus Trinla : 



288 



of six caeca and upwards in 



Scorjxzna and Holocentrum : 

 of nine caeca in the Sprat, 

 fig. 288 : and so on, increas- 

 ing to a numerous group of 

 pendent pyloric pouches, as 

 we find in the Scomberoids, 

 Chaetodonts, Gadoids, fig. 

 285, Halecoids, fig. 286, 

 Cyclopterus, and Lepidos- 

 teus. There is a difference, 

 however, worthy of note, in 

 the mode and extent of at- 

 tachment of these numerous 

 caeca: in the Salmon, fig. 286, Herring, fig. 281, d, Sprat, fig. 

 288, and Haddock, they rank almost in a line along the whole 

 duodenum : in the Gymnotus, Lump-fish, and Whiting, fig. 



Pyloric cseca of the Sprat (Clupea sprattus) 



