CRUISES OF THE "MICHAEL SARS " 93 



coast of North America, by the "Challenger" near Japan, and 

 by the "Valdivia" in the Indian Ocean at the bay of Aden. 

 At this night-station, too, there were black fish in the upper 

 layers, such as Ash^onesthes 7iiger (Fig. 80), a dark Dacty- 

 lostoinias, and some black Cyclothone at 300 metres. An 



Fig. 79. — New Spfxies of Leptocephalus. 



interesting cuttle-fish with stalk-eyes was taken at 350 metres, 

 and deeper down we got Serrivoiner, Ahmichthys scoiopaceus, 

 MalacosteiLS niger, M. choristodactylus. 



At this station we were able to try an apparatus for 



Fig. 80. 

 Asironesthes niger. Rich. Nat. size, 3.5 cm. 



ascertaining the depth to which the rays of light penetrate. 

 It was constructed by Helland-Hansen, and is likely to Heiiand 

 prove useful in the study of the forms of life in deep water. ^^^"J^^^^^^j. 

 The apparatus shows the intensity of the light both from above and °™^ ^^ 

 and from the sides. By means of panchromatic plates and p^ 

 colour filters it is possible to tell, not merely whether there is 



otometric 

 experiments. 



