Bd. V: 6) THE FISHES OF THE SWEDISH SOUTH POLAR EXPEDITION. 57 



lata is probably similar, but I have also in the ventricle of this species several times 

 found Polychœta. In N. coi'iiceps I have found mostly Crustacea, even small crabs. 

 N. macroceph. marinorata appears to feed to great extent on sea-snails. Especially 

 the large and middle-sized specimens contained in their stomachs the remains of 

 what seemed to have been opistho-branclwate molluses of great size, often so big 

 that one specimen completely filled the whole stomach. That fishes like this one 

 and the foregoing, which live among the vegetation happen to swallow pieces of 

 the same along with their prey which crawled on and among the algœ can be easily 

 understood. I therefore regard the algœ found in the stomachs of these fishes as 

 accidentally engorged. That so really is the case is proved by the fact that the 

 pieces of algae found in the posterior part of the intestine are just as little digested 

 as those I found in the ventricle. 



In the ventricle of Trematomits hausoni gcorgianus 1 have not found any re- 

 mains of food material that were recognizable. The specimens of Cliainpsocephabis 

 gunnari examined had also empty ventricles, but there cannot prevail any doubt 

 that it preys on fish. A similar conclusion may also be drawn concerning Para- 

 ckœnichthys georgianus, but in the latter case it has been distinctly proved by the 

 unmistakable remains of two fishes in the stomach of one specimen of this kind. 



The greatest number of pyloric ca^ca has been found in Treniatonius hatisoui 

 georgianus. In that species they are 7, rather large and long. The same number 

 is also found in some specimens of Nototlienta coriiceps divided into two groups, 

 one with 3, the other with 4, in other specimens of the same species and from the 

 same locality, however, either group contains only 3, and the whole number is thus 

 only 6. In A", brevipes I have counted 6 pyloric appendages, in N. situa 6 or 5, 

 in N. tesscllata 5. In N. mizops nudifrons there are 6 such appendages, but some 

 of the middle ones are so reduced in size so that it is very probable that at least 

 one of them in certain instances wholly disappear. A', macrocephala marniorata 

 has 5 large pyloric appendages. A^. gibberifrons has 4 large and wide pyloric caeca. 

 Chanipsocephalus guntiari is provided with only 3 pyloric appendages which, how- 

 ever, are quite large, especially one of them (see fig. 4). The same number is also 

 found in ParachœnicJithys and Harpagifer. It may be concluded from this that 

 the more specialised members of the family have been subjected to a reduction 

 with regard to the number of their pyloric appendages. 



The arrangement of the intestine is practically the same in all Nototheniidœ. 

 In Treniatomiis hansoni georgianus the intestine is comparatively long and runs 

 first from the pyloric region forwards. From a place just behind the small right 

 lobe of the liver it then descends along thn right body wall to the posterior end 

 of the abdominal cavity from where it again curves forward to the pyloric region 

 and then descends to the anus. The whole course of the intestine thus forms a 



