992 DR. G. HERBERT FOWLER ON THE [ Dec. 15, 
the methods employed and the general questions of distribution 
will be left to the last paper. 
SAGITTA WHARTONI, sp. n.' (Plate L. figs. 1-3.) 
In external form this species resembles most nearly S. lyra 
(Krohn), and differs from all other species yet described in the 
approximation, almost fusion, of the paired lateral fins. From 
Krohn’s species, however, it is easily distinguished by the absence 
of a constriction between body and trunk and by the numbers of 
the teeth and cirrhi. 
The head is large, 3-4 mm. wide and 2 mm. long in a specimen 
45 mm. long. It bears on each side 8-10 stout cirrhi (Greithaken), 
which are strongly curved, and of which the middle three are the 
longest. The accessory teeth (Nebenkiefer) are arranged in two 
series, of which the more dorsal are 3-5 in number and are short 
and stout; the more ventral are 5-7 in number and are slighter 
and longer. The neck is somewhat thinner than the body. The 
body tapers without constriction to the tail; the latter (post-septal 
region) is less than one-fourth of the total length. ‘The lateral 
fins are set rather far back, the anterior being much longer and 
narrower than the posterior. 
The longest specimen measured 45mm. The following dimen- 
sions are taken from well-preserved straight specimens, of which 
A was apparently uncontracted, B contracted considerably antero- 
posteriorly :— 
A. B. 
Total length 2st. a. 30 mm. 38 mm. 
Hicad Fee RL Oe 1 2 
Body Se Oe 23 26 
Vaile 7 9, eR oes Mee 6 10 
Neckitwidthivesca.eee eee 15 3 
Body, width at widest .... 2 + 
Anterior fin, length ...... 20 18 
89 jot WORE sts hae 3 6 
Posterior fin, length...... 10 7 
b oo Wad nko: 4 9 
Tarl-fin, width’ 2... .% 4. st. 3 6 
It is curious that this species should not have been taken by the 
Plankton Expedition, which records * S. bipunctata from the north 
of Scotland. From this it is distinguished readily by the approxi- 
mation (continuity) of the lateral fins. 
From S. hexaptera it is further distinguished by the size of the 
head, by the slightly more backward position of the posterior 
lateral fin, by the possession of more numerous cirrhi, and by the 
absence of the five-rayed star on the accessory teeth (cf. Strodtmann, 
loc, cit.). 
1 In honour of Admiral Wharton, R.N., the Hydrographer, a steady friend 
to oceanic research. 
? Strodtmann, “Systematik der Chaetognathen,” Arch. fir Naturgeschichte, 
lyiii. Band i. pp. 383-376, pl. xvii. 
