206 " ENDEAVOUR " SCIENTIFIC RESULTS. 



with great simplicity in the three columns. Nototodarus 

 gouldi, Loligo etheridgei, Sepioteuthis australis, all the Sepice, 

 and the Polypi fall in the first column (0-150 fathoms). In 

 the second (150-300 fathoms) appear Enoploteuthis galaxias, 

 Calliteuthis miranda, Nototodarus gouldi, Rossia australis. 

 Sepia hedleyi, the Polypi, and the two Opisthoteuthids. The 

 third column, which includes depths from 300 to 450 fathoms, 

 the most profound at which C'ephalopods were taken, contains 

 only a Sepia, Nototodarus goiddi and Opisthoteuihis pluto. 



But, although the " Endeavour's " trawling data do not 

 compose them.selves in any other way quite so easily, it is 

 appaient that a better comprehension of the true vertical 

 distribution of the species, especially for correlation with 

 future work, may be attained by preparing a table 

 on the basis of 100-fathom increments. This is accordingly 

 done in Table III , and it at once brings out what the simpler 

 arrangement could not do, the empty sj)aces as well as the 

 solid facts of our knowledge. The circumstance that Nototo- 

 darus gouldi is the only species appearing in all five columns is 

 alone perhaps indicative of the incompleteness of the table. 

 Again, were our data far more extensive than they are, they 

 can afford us only a poor picture of the reality until we are 

 able to take into account the complex and still almost wholly 

 unknown phenomena of vertical migration, both seasonal and 

 diurnal. 



