1896.} PLANKTON OF THE FAEROE CHANNEL, 993 
From S. bipunctata it is readily distinguished by the number of 
teeth in the accessory rows and the proportions of tail to body. 
A row of stout processes is placed on the ventral side of the 
rows of accessory teeth. These appear to correspond to the 
“« follicoli vestibolari” of Grassi; but in forming a single row they 
differ from those which he figures as characterizing S. hewaptera’. 
I have been unable to detect any trace of a “ corona cigliata ” 
(Riechorgan) on the dorsal surface of the head and neck. 
This species* appears to be present in both the “ cold” and the 
“warm” areas *® of the Faeroe Channel, and to be a characteristic 
component of the “‘ Mesoplankton,” 7. e. the floating and swimming 
organisms between a depth of +100 fathoms below the surface 
and a depth of +100 fathoms from the bottom. 
Horizontal distribution: 61° 18’ N., 4° 21' W., to 59° 42’ N., 
CW: 
Vertical distribution :— 
Greatest depth—warm area—Sta. 19 a, 480 to 350 fathoms ; 
temp. 46° to 47° F. 
Greatest depth—cold area—Sta. 13 g, 465 to 335 fathoms ; 
temp. 31° to 33° F. 
Least depth—Sta. 13 2, 100 to 0 fathoms; temp. 48° to 54° F. 
‘The least depth given above was the only occasion on which it 
was taken anywhere near the surface, except for one doubtful and 
broken specimen at the surface at midnight (Sta. 15). There is 
no doubt that this species is essentially Mesoplanktonic, with a 
very wide temperature range (at least 33° to 48° F.); it occurred 
in every haul, but one, of those made between 530 and 100 fathoms 
(i. e. in eight out of nine hauls); it occurred in every haul which 
began at or lower than 300 fathoms and finished at the surface 
(three hauls); and was taken, certainly, only once in a haul 
which began at 100 fathoms and ended at the surface (once out of 
twenty-two hauls). 
SpapELLA (Krounta) HAMatvA, Mobius. (Plate L. fig. 4.) 
Having obtained a large number of well-preserved specimens of 
this species, I think it worth while to give an outline (fig. 4) of 
the external form, since both the original figure of Mébius * (which 
has been simply copied by-Hertwig * and by Grassi") and also the 
1 Grassi, loc. cit. infra, pl. iii. fig. 6. 
2 T am anxious to leave the discussion of the bathymetric limits of the species 
taken on H.M.S. ‘ Research,’ and of the means used to determine these limite, 
till the material has been more fully investigated. At the same time, in 
describing a new species it is necessary to provisionally indicate the depth at 
which it was taken; but remarks under this heading must he for the present 
considered as provisional, except in the case of surface forms. 
3 For an explanation of these areas, see Wyville Thomson, ‘ Depths of the 
Sea.’ London, 1874. 8vo. 
4 Jahresb. Commiss. wissenschaft. Untersuch. deutschen Meere, Jahrg. ii., 
iii. p. 158, pl. iii. fig. 18. ; 
> “ Die Chaetognathen,” Jenaische Zeitschrift, xiv. pl. ix. fig. 7. 
6 «JT Chetognati,” Fauna und Flora Golf. Neapel, v. pl. i. sar e 
