ASTRORHIZIDAE 69 



Twelve stations: 163, 177, 181, 182, 186, 196, 377; WS 387, 395, 484, 488, 494B. 



Always rare, usually only a single specimen at each station, but more frequent at 

 Sts. 181, 182, 186. 



I have separated the species from T, bulla with which it was included in the South 

 Georgia report (SG 67), chiefly because it occurs at many stations in company with very 

 typical specimens of that species, and without intermediate forms. Its pure white, 

 highly domed test in such circumstances is very distinctive, in contrast with the much 

 darker tests of T. bulla which incorporate large sand grains, but it is doubtful whether 

 the two forms are specifically distinct. The specimens agree with the description as 

 quoted by Wiesner. " Like T. bulla, but only built up of fine white cement without 

 noticeable sand grains, the surface is therefore smooth, occasionally wrinkled, or with 

 depressed points." Specimens are between 0-2 and o-6 mm. in diameter. 



96. Tholosina protea, Heron-Allen and Earland (F 66) (SG 68). 

 Five stations: 175, 177, 182, 190; WS 482. 



Always very rare; the best specimens at Sts. 175, 182 and 190. 



97. Tholosina vesicularis (Brady) (F 67) (SG 69). 



Fifteen stations: 169, 172, 177, 181, 182, 187, 377, 384; WS 201, 475, 482, 484, 494B, 514, 515. 



Frequent at St. WS 494 B but rare elsewhere. The rarity is doubtless to some extent 

 due to the lack of pebbles, or other suitable material for attachment, in most of the 

 gatherings. The stations are widely scattered and range down to 4134 m. 



Genus Armorella, Heron-Allen and Earland, 1932 



98. Armorella sphaerica, Heron-Allen and Earland (SG 71) (Plate H, figs. 12-14). 

 Seven stations: 167, 181, 182, 186, 190, 363, 382. 



Frequent at St. 181, where excellent specimens were found, some bearing exception- 

 ally long tubes, and others showing the variations due to the use of coarse and fine sand 

 grains which were illustrated in the South Georgia report. At St. 363 in the South 

 Sandwich Islands three specimens were found using angular black volcanic sand which 

 gave them an exceptionally rough exterior. All the stations except one lie in shallow 

 water (93-344 m.) on the shores of the South Sandwich Islands, South Orkney Islands 

 and the Palmer Archipelago, and the species is probably universally distributed in 

 shallow water in these areas. The one exception is a single spherical specimen with 

 many short tubes, found at St. 382 in 3647 m. This station lies ofl" the South Shetlands, 

 and the specimen may have been carried into deep water by ice. Cushman in the second 

 edition of his book on Foraminifera (C. 1928, etc., F, 1933, p. 70) has reduced the genus 

 Armorella to a synonym oi Astrammina, Rhumbler (Rhumbler in Wiesner, 1931, FDSE, 

 p. 77, pi. ii, fig. 19). This is entirely incorrect; the two organisms have only a slight 

 superficial resemblance to each other, and their origins are apparently quite distinct. 

 Astrammina would appear to have affinities with Saccammina in its firmly cemented 

 shell, while Armorella is unquestionably connected closely vidth Tholosina. 



I have submitted specimens of Armorella to Dr Ludwig Rhumbler and Herr 



