92 DISCOVERY REPORTS 



Wiesner, in his recent monograph on the Foraminifera of the German South Polar 

 Expedition (W. 193 1, FDSE), does not record or figure any specimens which can be 

 identified with Miliamnihia. This is all the more noteworthy as Wiesner was quite 

 familiar with our Terra Nova Report (see p. 54, FDSE, et passim) and his material came 

 from approximately the same area as much of the Terra Nova material, in which the 

 genus was plentiful. 



149. Miliammina oblonga, Heron-Allen and Earland (Plate III, fig. 17; Plate V, figs. 

 1-5, 7, 8). 



Miliammiria oblonga (Chapman), Heron-Allen and Earland, 1929, etc., FSA, 1930, p. 41, pi. i, 

 figs. 1-6, 22-3. 



Forty-seven stations: 13, 14, 20, 23, 27, 30, 31, 42, 45, 123, 126, 129, 131, 136, 140, 143, 144, 148, 

 149, 660; WS 18, 25, 27, 28, 32, 33, 37, 40, 41, 42, 43, 45, 46, 47, 48, 50, 52, 63, 63-4, 113, 154, 

 348. 349' 357 ; Drygalski Fjord; MS 14, 68. 



Test regularly quinqueloculine ; chambers tubular, larger at the aboral extremity; 

 peripheral edge rounded to sub-acute; sutural lines almost flush in the young stage, 

 becoming more or less depressed with increasing size of shell. Aperture crescentiform 

 at extremity of final chamber, sometimes on a somewhat produced neck, with or without 

 a reverted collar, furnished with a small simple tooth. Wall thin, composed of minute 

 mineral grains embedded in an excess of siliceous cement, smooth, often polished, in 

 which case the mineral particles of which it is partly composed are more distinct. 

 Colour variable from very light to dark grey, rarely brown, or afltected by the colour of 

 the mineral particles employed. Size very variable in different localities. Young 

 individuals have been seen only 0-125 rrinfi- in length, but average well-developed tests 

 are about 0-40 0-50 mm. in length, 0-20 mm. in breadth, 0-15 mm. in thickness. The 

 thickness of the wall in an adult shell is estimated at o-oo5-o-oio mm., and the largest 

 mineral flakes employed by the South Georgian specimens rarely exceed these dimensions. 

 Elsewhere larger mineral flakes are used, as we noted in 1922 {ut supra). In the South 

 Georgian material, diatomaceous debris appears to be used to some extent in the con- 

 struction of the test, contrary to our experience with the Terra Nova specimens, in 

 which only mineral matter eould be detected (H.-A. and E. 1922, TN, p. 67). But it is 

 very difficult to verify the nature of the minute constituents of the test. 



Almost universally distributed, M. oblonga is probably the commonest and most 

 characteristic rhizopod of the South Georgia area, occurring in more or less abundance 

 in nearly every coastal sounding. It reaches its optimum development, both as to size 

 and numbers, in moderately shallow water. The best stations are Sts. 20, 126, 144, 

 WS 28, 33, 42 and 154; but occasional small specimens have been found down at a 

 depth of 1752 m. at WS 63, beyond which depth it has not been seen in any of the 

 soundings examined. The species is subject to considerable variation, mainly owing to 

 differences in the rotundity of the tubular chambers, with corresponding changes in the 

 sutural depressions and peripheral angles. 



The original type of Chapman, M. arenacea (Chapman), does not occur in the 



