CHAETOGNATHA. 5 
SAGITTA ZETESIOS. 
Sayitta zetesios, Fowler, Transactions of the Linnean Society, 2nd Series, Zoology, x. (1905), p. 67. 
To this species I refer, with very great hesitation, three specimens from tempera- 
tures below zero (Centigrade). The numbers, the size, and the shape of the teeth and 
jaws agreed fairly well with those of specimens already described, but the specimens 
were in far too battered a condition for the determination to be reliable. 
Formule :— 
12 [ca.] ? 9 6 13-14 
10 30 8-9 5 Hie12 
9 33 9 5 8-9 
KRoOHNIA HAMATA, Moebius. 
These specimens were quite unmistakable. In some of the younger specimens 
the older jaws showed the characteristic sagination figured by Strodtmann and 
myself in northern specimens. 
Formule, based on twenty specimens :— 
17 Ai 7-8 8-9 
15 20-23 7-9 7-13 
14 25 8 26 
13 26 6-7 9 
12 25-29 7-9 7-10 
Hal 22-27 6-9 ? 4-12 
10 30 7-8 2 3-7 
The actual observations are as follows. They have been arranged in order of 
decreasing temperatures, which agrees, except for a single entry, with the order of 
increasing latitude. 
| Sagitta 
Station. Date. | Position. TGentigrade, | hamata, | 8?tatoden-| nerapters 
299 | Dec. 14,1875 | 38° 31'S. 74° 43’ W. | 15°to16°6 | — 1 7 = 
302 | Dec. 28,1875 .| 42° 43"8., 82°11’ W. | 12°7 11 17 6 = 
308 | Dec. 30,1875 .| 45° 31'S, 78°9'W.| 12° 2 4 a7 4 = 
159 | Mar.9 &10,1874| 47° 25'S., 130° 29’ E 10° 5 24 1 3 = 
146 | Dec. 29,1873 .| 46° 46'S. 45°81’ E. 6° 1 80 Fa 2 at 
nr. 150 | Feb. 3,1874. .| 52° 4'S., 71° 22' E. 2° 7 4 = 
156 Feb. 26, 1874 ~ .} 62° 26’ S., 95° 44’ BE. Oi 9 — 
154/5 | Feb. 21,1874 .| 64° 27'S., 90° 48' E.| —0°3 
1 
153, Feb. 14,1874 .| 65° 42'S., 79° 49’ E. —-1°6 18 = 1 
