CH^TOGNATHA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 985 



to note that, although this animal has a very delicate and rather flaccid body, it seems 

 to suffer from the effects of preserving fluids less than most of the Chsetognatha. 



The specimens were all very typical and call for no comment. 



Horizontal distribution : 26° 23' N., 20° 20' W.-30° 5' S., 45° 28' W. 



Vertical distribution : surface. 



Temperature range : 72°-81"5°F. 



Stations: 7, 12, 15, 18, 19, 21, 25, 26, 27, 29, 32, 33, 35, 36, 37, 39, 44, 46, 47, 

 64, 66, 73, 86, 93, 506, 515, 525, 526. 



Sagitta serratodentata (Krohn). 



The above widely distributed and well-marked species was found in fifty-nine tow- 

 nettings. It was thus present in more samples than any other species, and, in 

 addition, it was very frequently more abundant than the other species in the haul ; 

 indeed, the only species which was ever as numerous as this was S. hipunctata, but 

 this last was only occasionally obtained in considerable numbers, so that on the whole 

 S. ser7xitodentata was the form most typically found in the surface tow-nettings. 

 It is to be noted, however, that no specimens of this species were taken south of 40° S., 

 although it has been found by other expeditions as far south as Magellan Straits and 

 the Falkland Islands. 



Horizontal distribution : 26° 23' N., 20° 20' W.-38° 6' S., 14° 32' E. 



Vertical distribution : surface. 



Temperature range : 64'9°-8r5° F. 



Stations: 7, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 25, 26, 27, 28, 29, 31, 32, 

 33, 35, 36, 37, 38, 39, 41, 44, 46, 47, 49, 54, 55, 56, 58, 59, 60, 61, 62, 63, 64, 71, 

 87, 88, 90, 93, 94, 95, 473, 476, 498, 501, 502, 504, 506, 515, 519, 524, 526, 529. 



Sagitta hipunctata (Quoy and Gaimard). 



This common species was fairly frequently met with, having been found in fifty-four 

 samples. On one occasion only was it taken in very considerable numbers ; this was 

 at a point eight miles from Cape Peninsula, South Africa, where a surface haul of 

 some ten minutes' duration captured several hundred specimens. As a rule, 

 however, the specimens taken in any individual haul were not numerous, and were 

 rather small in size. It has been found impossible to determine exactly what stations 

 might be called coastwise, so that this collection can throw but little light on the 

 question put forward by Steinhaus (1896) as to whether this is mainly a neritic form 

 or not. Sagitta hipunctata seems certainly to be found under oceanic conditions ; but 

 it may be noted that in the only haul mentioned as being taken very near land — the 

 one above — this species appeared to the exclusion of all others, and the specimens 

 captured were larger than most of those taken at other stations. As far as can be 

 judged, also, the members of this species caught on the high seas were usually rather 

 small in size and immature. 



