994 .DR. G. HERBERT FOWLER ON THE [Dec. 15, 
more recent figure of Strodtmann *, owing doubtless to ill-preserved 
material, are capable of improvement in respect of the lateral fins. 
There can be no doubt that the ‘ Research’ specimens are refer- 
able to this species, since they agree with Mobius’s description 
and figures of the cephalic armature to the minutest detail. 
This species appears to be an essentially northern form. It was 
originally described by Mébius from the following localities :— 
N. of Hanstholmen, Korsfjord (twice), and N.W. of Skagen 
(misprinted 8.W., loc. cit. p. 158) during the cruise of the 
‘Pommerania,’ 1872. 
It was recorded by Levinsen® from Greenland (Kronprinsens 
Eiland), from 30 m. W. of Cape Farewell, and from lat. 59° N.; 
long.?; lat. 57° 50’ N., long. 48° 43’ W.; lat. 57° 48’ N., 
long. 43° 45’ W. 
Strodtmann records it from the North Atlantic Drift (“ Gulf- 
stream”), Irminger (Greenland) Sea, and the Labrador Current, 
i. e. from 60° to 50° N. latitude, as having failed in no single haul 
made by the ‘ National’ (Plankton Expedition) in 1889. 
In the Faeroe Channel it was rarely absent from a tow-net. 
The deepest haul in which I obtained this species was in the 
warm area—Sta. 19a, 480 to 350 fathoms; temperature 46° to 
47°F. It may be regarded as having a fairly wide range of tem- 
perature (eurythermal), since it was obtained from the surface at 
a temperature of 53° F. (haul 154), and at a temperature of less 
than 33° F. (haul 13g, 31° to 33° F.) in the cold area. 
These four instances are, I believe, the only records of the 
occurrence of the species. 
In illustration of the ease with which one may fail to collect 
specimens of a fairly plentiful species, may be cited two successive 
hauls, made within an hour of each other: 
Haul 19 a, 480 to 350 fm., gave 6 specimens of S. hamata. 
» 196, 480to 0 5 0 FS ts 
In other words, 6 were caught in-towing through 130 fm. of 
water, none in towing through 480 fm. (cf. Strodtmann, loc. cit. 
p- 367) with the same net at the same place. 
SALPA ASYMMETRICA, sp.n. (Plate L. figs. 5-8.) 
As was the case with most Salpx collected on the ‘ Research,’ 
the specimens of this species were considerably damaged by 
pressure against the tow-net, owing to the heavy rolling of the 
ship when heaved to. Not all anatomical details could therefore. 
be satisfactorily made out, but the following appear to be good 
characters :— 
External cHaracrurs.—Body ovoid, flattened, devoid of pro- 
cesses. Apertures in solitary form terminal; apertures in sexual 
1 “ Systematik der Chaetognathen,” Arch. Naturgeschichte, lviii. Bd. i. 
pl. xvii. fig. 17. 
* «Om nogle pelagiske Annulata,” Vidensk. Selsk. Skriften, (6) iii. 321. 
