NARRATIVE OF THE CRUISE. 
741 
organs in connection with observations made on living 
specimens at the Norwegian coast has, on the other hand, 
led me to the conviction that these globules, in spite of 
their striking similarity to eyes, do not represent visual 
organs at' all, but constitute together a highly complicated 
luminous apparatus ; the lenticular body of the organs, 
generally described as a true eye-lens, acting as a condenser, 
which, in connection with the great mobility of the 
globules, enables the animal to produce at will a very 
bright flash of light in a given direction. The great 
majority of the species possess these organs, generally 
arranged in a perfectly similar manner ; but in a large, 
non-pellucid deep-sea Euphausia (not represented in the 
collection), v. Willemoes Suhm could not detect these 
globules in their usual place. 
“ The extensive use of the surface net during the 
Expedition at many different localities, and carried on by 
day as well as by night, has brought together a very large 
number of these interesting Schizopoda, both adults and 
larvae, and of course our knowledge of this family has been 
very materially increased. No less than twenty-seven 
species are represented in the collection, belonging to six 
different genera, of which four are new. One of these 
genera, Nematoscelis, G. 0. Sars, is distinguished by the 
enormously elongated and slender form of the second pair 
of pediform appendages (the modified gnathopoda). In 
another genus, Stylocheiron, G. 0. Sars, on the other hand, 
the third pair of legs has been peculiarly modified, 
being also greatly elongated, the two last joints forming 
together a kind of imperfect chela. In accordance with 
their pelagic life the geographical distribution of the species 
is generally very extensive. By far the most widely 
distributed is, however, the Euphausia pellucida, Dana 
(fig. 263), ranging from Norway ( Thysanopoda hidentata, 
G. 0. Sars) and the Mediterranean ( Euphausia mulleri, 
Claus), throughout the Atlantic and Pacific up to the 
coast of Japan. The large number of larvae caught with 
the help of the surface net has also enabled me to trace 
the very interesting and complicated development of 
Pig. 263. — Euphausia pellucida, Dana. 
