292 



DE. G. H. FOWLER — BISCAYAN PLANKTON : 



The next table records the distribution of these larvae by day and by night in the 

 epiplankton : — 



At 



25 



50 



75 



100 



^ 



r 37 per cent, of 8 hauls by day, with 1-25 



With them, as with magna, there is an increase in the night population at 25, 50, 75, 

 and 100 fathoms, which seems to point to a nocturnal rise of specimens from 200- 

 100 fathoms. The plurimum at 75 fathoms is more marked by night than by day. 



CoNCHffiCIA PROCEEA, MiiUer. 



At 



Between 



50 



75 



100 



150-50 



200-100 



250-150 



300-200 



400-300 



500-400 



750-500 



fathoms 

 this species 

 occurred in 



7 per cent, of 13 hauls, with 0-15 











50 



70 



1 

 6 

 1 

 1 

 

 

 1 



out of 



12 

 13 

 10 

 17 



1 



7 

 3 

 3 

 3 

 3 

 4 



0-on 



0-00 

 1-10 

 4-41 



400 

 2-00 

 0-33 

 0-33 

 000 

 0-00 

 010 



average 



specimens 



per hour 



haul. 



average 



specimens per 



100 fathom 



haul. 



The species was, comparatively speaking, rare; it was taken only once at the surface, 

 never at 25 or 50 fathoms. The table shows a plurimum for the epiplankton at 

 100 fathoms, and that tlie species extended in fair numbers into the 200-100 fathom 

 zone. The single specimens and fractional averages below this zone may be attributed 

 to dead or dying specimens. Analysis of the epiplankton captures showed no trace of a 

 nocturnal rise from the upper mesoplankton. 



CoNCHOECiA pusiLLA, Mliller, var. major, Miillcr. 



This species was only captured 



Between 750-500 fathoms in 3 out of 4 hauls, with 0-501 average specimens 

 1000-750 „ 1 „ 5 „ 0'08j per 100 fathom haul. 



