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Show 994 DR. G. HERBERT EOWLER 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 referable to this species, since they agree with Mobms's description and figures of the cephalic armature to tbe minutest detail. This species appears to be an essentially northern form. _ It was originally described by Mobius from the following localities :- N. of Hanstholmen, Korsfjord (twice), and N.W. of Skagen (misprinted S.W., loc. cit. p. 158) during the cruise ot the ' Pommerania,' 1872. It was recorded by Levinsen 2 from Greenland (Kronpnnsens Eiland), from 30 m. W . of Cape Farewell, and from lat. 59 IN., 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 m the warm area-Sta. 19 a, 480 to 350 fathoms ; temperature 46° to 47° F. It may be regarded as having a fairly wide range of temperature (eurythermal), since it was obtained from the surface at a temperature of 53° F. (haul 15 b), and at a temperature of less than 33° F. (haul 13 #, 31° to 33° F.) in the cold area. These four instances are, I believe, the only records ot the occurrence of the species. In illustration of the ease with which one may tail 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. „ 19 o, 480 to 0 „ 0 In other words, 6 were caught in towing through 130 fm. of water, none in towing through 480 fm. (cf. Strodtmann, loc. at. p. 367) with the same net at the same place. SALPA ASTMMETRICA, sp. n. (Plate L. figs. 5-8.) As was the case with most Salpse 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 CHARACTERS.-Body ovoid, flattened, devoid ot processes. Apertures in solitary form terminal; apertures in sexual i " gystematik der Chaetognathen," Arch. Naturgeschichte, lviii. Bd. i. pl. xvii. fisf. 17. "2 " 6 m nogle pelagiske Annulata," Vidensk. Selsk. Skriften, (6) iii. 321. |
