of the Fuhery Board for Scotland. 15^ 



Owing to the difficulty of distinguishing the species of Schizopoda off- 

 hand, their occurrence is frequently recorded in the lists of tow-net fauna 

 simply uuder the family names, " Ephausiidse " or " Mysidae," or the 

 generic names Boreophausia sp.," " Mysis sp.," as the specimens 

 observed happened to belong to either group ; and before taking up the 

 consideration of the detailed species, it is proposed to consider briefly the 

 distribution of the Schizopoda under these names, as follows : — 



The EuPHAUSiiDiE. — The records of the Schizopoda under the name of 

 Euphausiidse or Boreophausia sp. amount to one hundred and twelve for 

 the seven years, and taking the one year with the other, they are distributed 

 over all the twelve months ; but the largest number occur in the first four 

 and the last three months, as indicated by the Table annexed, which 

 shows the number of the records of the Euphausiidce that are referred to 

 simply under their family or generic names for each station, and for each 

 month of the year for all the seven years. 



Table I., showing the Distribution of the Euphausiidse, as indicated by 

 the Records for the Years, Months, and Stations : — 



Years. 



S 



Feb. 



1 March. 1 



April. 



1 May. 1 



1 June. 1 



1 July. 



1 August. 1 



1 Sept. 1 



Oct. 



o 



1 Dec. 



Totals for 

 the Years. 



Years. 







> 



> 



1 VIII. 1 



M 



•-H 





1889, . 



1 











1 



1 



1 





1 







5 



1889, . 



2 







2 





1 



5 



1890, . 





3 



6 



3 







3 







3 



2 



1 



21 



1890, . 



2 



5 



2 



6 



3 



3 



21 



1891, . 



4 



3 



2 



1 



7 



4 













1 



22 



1891, . 



4 





5 



2 



4 





22 



1892, . 



3 



4 



5 



2 



4 





1 





1 









20 



1892, . 



2 



5 



1 



3 



3 



6 



20 



1893, . 



7 



4 





1 











1 



4 



4 



6 



27 



1893, . 



5 



7 



3 



6 



3 



3 



27 



1894, . 



2 



6 





1 

















1 



10 



1894, . 



3 



1 



1 



2 



2 



1 



10 



1895, . 





2 

















1 





5 



8 



1895, . 



1 



3 



1 





1 



2 



8 



Totals for 

 the Mouths, 



17 



22 



13 



8 



11 



5 



5 



1 



2 



9 



6 



14 



113 



Totals 

 for the 

 Stations, 



19 



28 



13 



21 



16 



16 



113 



Of these records thirty-one are for the Euphausiidse observed in the 

 surface tow-nets, while the other eighty-one are bottom tow-net records. 

 In few of the surface gatherings were Euphausiidse frequent or common, 

 but in a number of the gatherings collected with the bottom tow-nets they 

 were fairly numerous. The results brought out by these Tables regarding 

 their distribution are referred to further on in connection with the 

 detailed account of the different species. 



Meanwhile I proceed to notice the records of the second group of the 

 Schizopoda as they appear under the general name of Mysis sp. or Mysidse. 

 I find that there are only thirty-three separate notices of Mysidse, and 

 three of these are entered under the name Leptomysis sp. The reason for 

 this is that most of the Mysidae were usually not so plentiful, and 

 were identified at the time or shortly after they were collected. The 

 records of Mysidse, though few in number, show a distribution very 

 similar to the Euphausiidse — that is, they occur chiefly among the statistics 

 for the colder months. There are no records of Mysidse for the three 

 summer months, while those for February, November, and December 

 are together equal to 71 per cent, of the whole number. I shall now 

 leave these more general groups for the present, and proceed to consider 

 the distribution of those forms recorded under distinctive specific names, 



L 



