56 



EINAR LÖNNBERG, 



(Schwed. Südpolar-Exp. 



sac which is not rounded, as in Treniatoiiius, but conical with the tip directed 

 backwards which indicates a greater specialisation for large prey (fish). The pj-lorus- 

 portion is short and wide nirected forward with sharp constriction at the pylorus 

 (fig. 4). ParachœnicJithys represents an intermediate stage between the two last 

 mentioned species. It has a very wide fundus-sack which is rounded posteriorly, 

 and a distinct narrowed pylorus-pnrtion which is directed forwards. 



■■■■O' 



Fie. 7.- 



Fig 



The different shape of the ventricles in these fishes stands evidently in con- 

 nection with the natural condition of their prey. 



Notothenia gibberifrons with its small mouth, which has such a direction and 

 shape that it seems suitable to, probably with a kind of sucking motion, collect 

 objects from the sea-bottom, must live on small animals living on or near the ground. 

 Eggs of other fishes with certainty constitute a very important part of its diet, as 

 may be concluded from the fact that in all adult specimens of this species eggs of 

 Cliampsocephalus gunnari were found. 



Other species of Notothenia live on different kinds of evertebrates. In X. bi'cvi- 

 pes I have found chiefly small Crustacea {Ampliipoda and Mysidacea). The same 

 were the contents of the ventricle of N. mizops and A', sima. The diet of N. tessel- 



