4 G. HERBERT FOWLER. 
IL—THE COLLECTION OF H.M.S. ‘CHALLENGER’ IN ANTARCTIC 
AND SUBANTARCTIC WATERS. 
Some six years ago Sir John Murray, K.C.B., kindly sent to me the 
Chaetognatha collected by H.MLS. ‘Challenger’ in 1873-1876. Captured at a date 
when methods of preservation (especially of plankton) had not been so carefully 
studied as of later years, and having lain for thirty years in alcohol, the specimens 
are, naturally enough, by no means in a condition to allow of a general report on the 
collection. So far, however, as could safely be done, I have attempted to identify 
the more characteristic species taken in nine hauls at the surface, which lay either 
in the cruise to the Antaretic or towards the subantarctic Patagonian region. These 
nine were the only hauls available in what may be termed the critical latitudes. They 
were studied mainly with the idea of finding approximately the northern limit of 
K. hamata at the surface, and the southern limit of S. serratodentata, the former 
being bipolar in the strictest sense, the latter being believed to be tropical, temperate, 
and subpolar only. They appropriately supplement the collection of the ‘ Discovery.’ 
A considerable number of the specimens were in a hopeless condition ; only those 
are listed here of the identification of which the writer felt reasonably certain. As to 
the records of K. amata and S. serratodentata, there can be practically no doubt, but 
S. hevaptera is less certain, and S. Zetesios (?) least certain of all. 
The species noticed in these hauls of the ‘Challenger’ were the same as those 
taken by the ‘ Discovery, with one addition. 
SAGITTA HEXAPTERA, dOrbigny. 
Formule, based on thirteen specimens :— 
31 16 10 5) 6-7 
26 17 10 5 6 
25 16 9 4 5-6 
Polk 13-16 8-10 A—9 A—}5 
18 21—22 8-11 4 5-7 
16 18 9 3 2 
15) 20 10-11 3-5 2-6 
11 25 9-10 3 2 
10 2 8-10 3 2-3 
SAGITTA SERRATODENTATA, Krohn. 
Formule, based on thirty-one specimens :— 
16 31 6-7 5 9 
5) 26-33 7-8 4—5 6—LO 
14 27=32 7-8 3-6 8-12 
3 27-30 6-7 5-6 9-14 
12 25-33 7 4-5 7-13 
a 27=32 7-8 3-6 8-12 
10 25-30 6-7 3-6 7-13 
9 27-33 6-7 2—4 4-8 
8 25-34 7 3—6 3-10 
