THE OSTRACODA. 



289 



At 



Between 



CONCHCECIA. LORICATA, ClaUS. 



' 23 per cent, of 13 hauls, with 0-30 -^ average 



10 „ O'GO > specimens 



„ 1'58 J per hour haul. 



out of 



17 



1 



7 

 3 

 3 

 3 

 3 

 4 



1-00 

 0-14 

 0-00 

 0-33 

 0-66 

 1-33 

 0-10 



average 



specimens per 



100 fathom 



haul. 



It occurred also in three non-comparable hauls, one of which was at 100 fathoms. 



Unlike some species ah'eady dealt with, loricata was found in the epiplankton by day 

 as well as by night. Of the 17 epiplanktonic occurrences, 8 were during daylight, and 

 contained 24 of the 37 specimens (numbers multiplied by time-factor). The epiplanktonic 

 specimens were comparatively so few that the mesoplanktonic specimens cannot be; 

 dismissed as dead or dying. This species would therefore seem to have belonged to the 

 lower epiplankton and upper mesoplankton, with a maximum at 100 fathoms, and 

 apparently anotlier at 500-400 fathoms. The mesoplanktonic specimens were on the 

 whole smaller than the epiplanktonic. 



CONCHffiCIA MAGNA, ClaUS. 



At 



Between 



38 per cent, of 13 hauls, with 0'84 



out oF 



12 

 13 

 10 

 17 



1 

 / 



3 

 3 

 3 

 3 

 4 

 5 

 3 







1-83 

 22-38 > 

 1700 

 3411 



GOO 

 2-85 

 100 

 0-33 

 0-6G 

 0G6 

 I-IO 

 0- 10 

 0-00 

 0-.20 



average 



specimens 



per hour 



haul. 



average 

 specimens 



per 



100 fathom 



haul. 



From this general table it would seem that the species lived in considerable numbers 

 in the lower epiplankton (50-100 fathoms) and upper epiplankton (100-200 ftxthomsi. 

 Below 200 fathoms the captures are so few in numbers tliat, considering the veiy 

 large numbers near the surface, we may with safety attribute them to dead or dying 



