SAGITTA GAZELLAE 239 



During the commission of the 'Discovery II' in 1950-51, I was able to count and measure all 

 specimens of S. gazellae which were collected, and also made observations on food, and the develop- 

 ment of the gonads. 



Table 1 summarizes the stations from which information was thus available, and Table 2 sum- 

 marizes the additional stations from which I have examined samples in order to cover the horizontal 

 and vertical range of the species. It was not necessary for this purpose to examine all the plankton 

 samples in the Discovery collections. For horizontal distribution I found it enough to use samples 

 from a selection of lines of stations covering all areas of the Southern Ocean (see Fig. 17, p. 261), and 

 have found enough hauls in subtropical and tropical latitudes to determine the northern limits of the 



Table 1. List of stations from which data were available at the commencement of this work 



Counts only 

 N70Y Stations 1220- 1229 



1312-1320 

 1415-1421 

 1441-1450 

 1472-1476 

 N100B Stations 1188-1258 (excluding 1191, 1192, 1194, 1196, 1207, 1230, 1231, 1234, 1247) 



133 1-1508 (excluding 1341, 1374-1379, 1398, 1432, 1457, 1459, 1477-1490, 



1500) 



Counts and measurements 

 N70V Stations 1608, 1609, 1610, 1612, 1614, 1616, 1617, 1620, 1622, 1624, 1628, 1632, 1636, 



1687, 1688, 1689, 1690, 1691, 1692, 1694, 1696, 1699 

 1702, 1705, 1720, 1725, 1727, 1767, 1768, 1769, 1771, 1772, 1773, 1774, 1775, 



1776, 1777, 1778, 1779, 1781, 1782 

 1805, 1806, 1807, 1808, 1809, 1810, 1812 

 2699-2704 (excluding 2700) 

 2736-2743 (excluding 2742) 

 2802-2812 (excluding 2809) 

 28 1 7-2821 

 2834-2892 (excluding 2836, 2840, 2843, 2845-2847, 2854, 2856-2866, 2873, 



2876-2879, 2881-2885) 

 N 100 B Stations 725-923 (excluding 728, 730, 732, 734, 736, 738, 740, 742, 744, 747, 749, 752, 



754. 75 6 > 75 8 . 7 62 > 7 6 4> 7 6 7. 77 "794> 79°. 798, 800, 802, 805, 807, 809, 



812, 814, 817, 821, 823, 826, 827, 832, 833, 835, 843, 846,864, 874, 875, 



876, 878, 888, 896, 897, 901, 907-910, 912-918) 

 942-1019 (excluding 944, 952-955, 957, 963, 979-982, 984, 987, 989, 991, 



993, 997, 998, 1002, 1004-1012, 1014, 1016, 1018) 

 2699-2704 (excluding 2701) 



2726-2731, 2736-2741, 2743, 2757, 2759, 2768-2770, 2785, 2794-2797 

 2802-2892 (excluding 2809, 2822, 2827, 2829, 2845, 2847, 2883-2885) 



species. The vertical series of hauls from lines of stations which have been repeated on a number of 

 occasions in the meridian of o° have been examined with the object of getting a picture of vertical 

 distribution in one locality for most months of the year. These were long lines of stations covering 

 Antarctic and Subantarctic waters. A series of deep vertical 2 m. net hauls, which extended from the 

 Antarctic into the tropics in the meridian of 30° W., were also used to check the depth range and to 

 examine the possibility of tropical submergence. 



Descriptions of the nets employed by the expedition and the manner of fishing them may be found 

 in Kemp, Hardy & Mackintosh (1929), Ommanney (1936) and Marr (1938). The positions and 

 hydrological information for most of the stations which will be referred to, may be found in the 

 various Discovery Station Lists. ('Discovery' Reports, Vols, iv, xxi, xxn and xxiv), but those from 

 St. 2699 onwards will appear in the Station List for 1950-51 which is expected to be published 

 shortly. 



