ATLANT. DEEP-SEA EXPED. 1910. VOL. III]. 



PELAGIC NEMERTEANS. 



11 



Nectonemertes mirabilis 

 Catches made by the "Michael Sars" 1910. 



Calculated 

 depth ( 2 A 



of the 

 length of 

 wire out). 



meter 



Length 



of 



wire 



out. 



meter 



Station and duration of haul. (H = hours). 



Total 



number 



of N. 



mirabilis 



caught in 



each depth 



53 



62 



64 



70 



80 



81 



82 



84 



87 



88 



90 



92 



101 



6 H. 



During 

 night 



During 



whole 



day 



5 H. 



6 H. 



3 H. 



3.5 H. 



4 H. 



3 H. 



6.5 H. 



3 H. 



4 H. 



3 H. 











1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 







66 



100 



1 sn. 



1 sn. 



1 sn. 



3 A sn. 



X 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 







133 



200 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



X 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 



1 sn. 







200 



300 



y- 



y- 



y- 



y- 



X 



y- 



y- 



y- 



y- 



y- 



y- 



y- 



y- 







400 



600 



y- 



3 A sn. 



3 A sn. 



3 A sn. 

 (700 m. wire) 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 







666 



1000 



x k sn. 

 (1100 m. wire) 



y- 



y- 



X 



y- 



y- 



y- 



y- 



y- 



y- 



y- 



y- 



y- 







1000 



1500 



y- 



(1600 m. wire) 



X 



X 



3 A sn. 

 Ill 



(1200 m. wire) 



3 A sn. 

 VII 



3 A sn. 

 II 



3 A sn. 

 IV 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



3 A sn. 



16 



1333 



2000 



'A sn. 

 (2400 m. wire) 



y- 

 II 



y- 

 I 



y- 



(1700 m. wire) 



y- 

 XVI 



y- 

 XVII 



y- 



y- 

 VI 



y- 

 I 



y- 

 III 



y- 

 ll 



y- 

 III 



y- 

 I 



52 



1666 



2500 



3 In. 

 I 



(2600 m. wire) 



3 A sn. 



3 A sn. 



X 



3 A sn. 

 I 



3 A sn. 



3 A sn. 



I 



3 A sn. 

 I 



3 A sn. 



X 



X 



X 



3 In. 



4 



2000 



3000 



X 



3 In. 



3 A sn. 

 I 



X 



3 In. 

 V 



3 In. 

 Ill 



3 In. 



y- 



I 



y- 



X 



X 



3 In. 



X 



10 



3 A sn., silknet of :J A meter's diameter. 1 sn., 

 trawl. 3 In., large net. Ring 3 metres in diameter, met 

 number of N. mirabilis caught. 



silknet of 1 meters diameter, y.. Dr. C. G. Joh. Petersen's young fish 

 a strimps net. X, no haul, -s- no nemerteans in the haul. I, II ... • 



The quantity of A/, mirabilis from the remaining 

 stations, albeit comparatively small, yet fully serves to 

 confirm the observations made at 80 and 81; the 66 nets 

 worked at these stations in depths of less than 1000 

 metres — including one young-fish trawl from each station 

 at 666 metres - - made but a single catch of the species 

 (St. 70, 3 spec.) at 800 metres, while a single capture is 

 recorded (St. 82) at 1000 metres depth, and beyond these, 

 only at 1333 metres or deeper. 



The lower limit of distribution cannot be determined 

 by this method; with a species of relatively infrequent 

 occurrence it is impossible to ascertain, by comparison of 

 the hauls, whether or not the nets fishing below 1000 — 1333 

 metres may have taken the specimens found while being 

 drawn up through upper portion of the area of distribution. 



The extensive hydrographical investigations made 

 partly at the same stations as the zoological, afford an 

 opportunity of seeking to characterise the vertical distri- 



