THE OSTKACODA. 



287 



25 fathoms lower, and sometliini^- like iiriocii minutes of latitude away ; the actual 

 numbers were 193 speeimens from 32 m, and 15 1< from 32 o, making abont 55 per 

 centum of the total specimens of this species captured. 



At 



25 I 



50 y 



CoNCHCECiA HADDONi, Brady & Norman. 



f per cent, of 13 hauls with O'OO 



100 J 



average 



specimens 



per hour 



haul. 



A single specimen also occurred at midnight at the surface in a non-comparable haul, 

 and other single specimens I)et\veen 350-0 and 1250-0 fathoms. It was not captured 

 once in a closing-net. The species was obviously epiplanktonic, with a centre at about 

 75 fathoms. 



CONCHCECIA HYALOPHYLLUM, ClaUS. 



As already mentioned (p. 266 note), it is possible that some specimens of this species 

 have been placed under magna. The numbers of occitrrences and actual numbers of 

 specimens captured may therefore perhaps be too small, but they arc probably correct iu 

 proportion for the various depths. 



008 

 0-15 

 2-10 

 2-29 J 



0-57 ~1 



0-33 



0-66 



0-00 



0-6(5 



0-60 



0-32 



013 J 



r 



average 



specimens 



per hour 



haul. 



average 



specimens per 



100 fathom 



haul. 



The recorded specimens arc by no means numerous at any depth, but they are widely 

 and almost consistently distributed vcrtictilly, down to the zone 1250-1000 fathoms. 

 They are too scarce in the upper strata for the idea that the mcsoplanktonic specimens 

 were merely epiplanktonic corpses ; this is all the more potent an argument because 

 every one of the recorded occurrences in the epiplankton is nocturnal, that is between 

 7.0 P.M. and 1.0 a.m. The species therefore had apparently much the same distribution 

 as mihricata ; that is, it was a mcsoplanktonic form, coming to the epiplankton at night ; 

 its plurimum distribution when there was at 75-100 fathoms. 



* Two specimens were also taken in 33 b, whicli has been oiniltud as non-comparable. 



