lo DISCOVERY REPORTS 



Sandwich group by the prevalent westerly winds or by floating ice". So it seems that 

 for the present we must accept the facts that the surface waters of the Weddell Sea are 

 crowded with diatoms while very few are to be found in the bottom deposits, and leave 

 the explanation for future investigators. 



PACIFIC INFLUENCE IN THE WEDDELL SEA 



As a result of the present investigation of the Scotia material some of the conclusions 

 reached in the previous report (see A, pp. 12, 23-4) require modification. They were 

 based on the evidence of the species listed by Pearcey, which seemed to show a rather 

 scanty foraminiferal fauna almost entirely of a cosmopolitan cold-water description. 

 This still holds, so far as the western and central areas of the Weddell Sea are concerned, 

 as also the statement that Pearcey's rare and new species do not extend into the Scotia- 

 Bellingshausen area. But the additions made to Pearcey's list indicate that the line of 

 the Scotia arc can no longer be regarded as a limit to the distribution of species of 

 Pacific origin. 



I worked out the Scotia material in order of latitude, and for a long time the results 

 were as expected and in accordance with Pearcey's records. Even the rich St. 313 with 

 a long list of species yielded nothing unexpected. But as I got farther south I was sur- 

 prised to record species which had not been found at stations farther to the north and 

 west. At St. 286 in 2488 fathoms, almost in the centre of the southern Weddell Sea, three 

 species of Lagena of distinctly Pacific origin were found, L. sidebottomi (No. 172), 

 L. desmophora (No. 137) and L. fimbriata var. occlusa (No. 140). This station appears to 

 be an outlier, as no warm-water species were detected at the stations to the east or west 

 of it. Farther to the south, however, in the vicinity of the Coats Land coast, the evidence 

 becomes more striking. St. 406, the most southerly station (in 72° 18' S), in addition to 

 yielding the only record of the genus Miliammina (No. 104) provided a single large 

 specimen of Gmidryina bradyi (No. iii), an extension of 10° S latitude on previous 

 records. St. 417, in 71° 22' S, yielded quite a long list of species of Pacific origin, 

 Logena quadrilatera (No. 167), L. fimbriata var. occlusa (No. 140), L. lamellata (No. 155), 

 Cassidulhia pacifica (No. 122), L. stelligera var. eccentrica (No. 176), Polymorphina 

 extensa (No. 197), Nodosaria raphanistruni var. (No. 185), and many other species, 

 including Globigerina bidloides (No. 199), not to be expected in such a high latitude. 

 This station represents the acme of development of warm-water species, and it is 

 curious that the closely adjacent stations, 416 and 418, show little evidence of Pacific 

 influence, which also diminishes as we go northwards away from the Antarctic coast- 

 line; St. 421, in 68° 32' S, yielded several species unexpected in such latitude, but the 

 only distinctly Pacific forms were Lagena quadrilatera (No. 167), L. stelligera var. 

 eccentrica (No. 176), and L.foveolata var. paradoxa (No. 143). St. 422, in approximately 

 the same latitude, gave no evidence whatever of warm-water influence, nor did St. 428 

 (66° 57' S), St. 432A (61° 21' S), or St. 438 (56° 58' S). The most northerly station 

 within the convergence, St. 447 in 51° 7' S, gives very little indication of warm-water 

 influence beyond the reappearance of Globigerina bulloides (No. 199), the specimens 



