336 On the Distribution of Mid-water Chetognatha. 
deeper waters of the Atlantic, and these few are small in 
size, being on the average less than 6 millim. in length. 
Below 200 fathoms and down to 700 fathoms these small 
Chetognatha become very abundant (no less than fifty-five 
appearing in the 500-fathom net), and numerous individuals 
averaging about 12 millim. make their appearance, also a 
few large specimens of 20-28 millim. were taken in the 
deeper nets. 
Then appears a break in the uniformity of the distribution. 
The four nets which were towed at depths between 80) and 
1000 fathoms caught far fewer Chetognatha than the nets 
above or below this zone, and although one large individual 
of 35 millim. was taken, those exceeding 10 millim. were 
not common. 
All nets from below 1000 fathoms brought up abundant 
individuals averaging from 8 to 10 millim., as well as a fair 
number between 10 and 15 millim. Specimens of 20 to 
32 millim. were more frequent than in the more superficial 
1000 fathoms, and in the nets from 1400 and 1500 were 
taken two gigantic Chetognatha of 40 and 47 millim. 
respectively. 
It appears, then, that whereas the distribution of the 
smaller Chetognatha (7. e. under 14 millim. in length) is 
fairly uniform throughout the intermediate waters of the 
North Atlantic in November, with the possible exception of 
a zone between 800 and 1000 fathoms, the larger forms are 
both more numerous and attain to a larger size in the deeper 
waters; for whereas but a single specimen (29 millim.) 
exceeding 26 millim. was captured in the nets towed above 
800 fathoms, eighteen specimens were found in the nets 
towed at depths between 900 and 1700 fathoms. 
EXPLANATION OF PLATE XXIV. 
The figures in the first column give the depths in fathoms at which 
the nets were towed. The value of each of the spaces between the hori- 
zontal lines is 20 fathoms. 
The numbers of the nets in the second column refer to the five stations 
at which the nets were lowered; they are :— 
Nos. 14,¢. Lat. 52° 475 .N., long. 11° 20"1 W. 
2a-g. Lat. 52° 4°5N., long. 12° 270 W. 
4a-l. Lat. 52° 27"6 N., ; Jong. 15° 40"0 W. 
5a. Lat. 52° 18"1N., lone. 15° 399 W. 
* 66-A, Lat. 52° 20"0 N., long. YS? 7 49 We 
The numerals in the body of the table show the number of individual 
Chetognatha of particular sizes captured by the nets indicated upon the 
same horizontal line. 
The /enyth (in millimetres) of the individuals is indicated by the figures 
