CAXADIAX FISHERIES! EXPKDITIOS, 191Jrl5 



21 



As will be seen from the above, the diameter A'aries up to 4/10 mm. 



Larva? of Drepanopsetta were found especially on the cruises of the Acad'ui and 

 Princess in July-August; they occur but sparsely, save at stations 81 and 8o (New- 

 foundland banks), where they were more numerous. The length of the larva- varied 

 between 5 and 20 mm. 



Distinction is made between two forms of Drepanopsetta; D. plabessoides, the 

 more arctic, which also extends down along the coast of America, and D. Umandoides, 

 the European form. 



Drepanopsetta lives preferably on sandy bottom, on the banks, but can also, at 

 certain times of the year, move down into the deep water of the channels, where it 

 then lives on soft bottom. 



14. FAM. GADIDJE. 



Gadus cvglefinus (Linnaeus). 

 Gadus callarias (Linnaeus). 

 Onos sp. 



Onos cimhrius (Linnaeus). 

 Merlnccius merluccius (Linnaeus). 



(Plate III, Figs. 16 to 22; TableII<7 to Hi.) 



The gadoids play the most important part in the material collected; ova and 

 young of this family were found in all the areas examined and on all the cruises 

 made. On consulting the chart, however, it will at once be noticed that the different 

 species have each their own area of distribution, and only occasionally overlap. 



The ova of cod and haddock cannot be distinguished one from another with ful] 

 certainty in the earlier stages. True, those of the haddock are, as a rule, some tenth.s 

 of a millimetre larger than those of the cod, but both species vary so greatly as to 

 overlap in this respect. I have, however, always counted such eggs as could be deter- 

 mined with certainty (i.e. those with developed embryo) in each sample, on the basis 

 of which it is justifiable to reckon the proportion between the two species, also as? 

 regards the earlier stages, at any rate with a considerable degree of exactitude. 



DiAMKTEKs in millimetres for Eggs belonging to the genus Oadus, from different 



Canadian localities. 



* With diagnostic pigmentation of the species. 



