94 DISCOVERY REPORTS 



fine mineral particles in an excess of siliceous cement. Colour light grey. Size varying 

 between o-30-o-45 mm. in length, o-20-o-32 mm. in breadth, and o-i3-o-22mm. in 

 thickness. 



This is a very distinctive species and may be considered isomorphous with Miliolina 

 subrotunda (Montagu). 



M. lata is much rarer in the South Georgian material than either M. oblonga or M. 

 obliqua, both as regards the number of stations at which it occurs and its relative 

 abundance. It nowhere forms a dominant aspect in the material as the forementioned 

 species frequently do, and generally speaking is rare. But it occurs frequently at WS 32 

 and 37, and very fine and typical specimens were found at other stations, notably St. 

 136 and WS 42 and 348. The deepest record is at St. 16 in 727 m., where only a small 

 specimen was obtained, the species evidently favouring shallower waters than its 

 relatives. At WS 32 a very extraordinary abnormality was found (Plate III, fig. 17) in 

 which a specimen of M. lata was fused with one of M. oblonga, the latter projecting 

 vertically to a height of 0-2 mm. from the centre of the lateral side of the former. 



Miliammina lata occurs at seven of the ten Terra Nova stations from which we 

 recorded Miliolina oblofiga var. arenacea, so it may be presumed that the species is 

 universally distributed in the Antarctic, like M. oblonga and M. obliqua. 



We figure an abnormal specimen from WS 50, at a depth of 230 m., characterized by 

 the prolongation of the final chamber into an enveloping curve terminated by a very 

 large aperture (Plate V, fig. 18). Such abnormalities are of frequent occurrence in 

 gatherings of its porcellanous isomorph, Miliolina subrotunda (Montagu). 



Family TEXTULARIIDAE 



Sub-family TEXTULARIINAE 



Genus Spiroplectammina, Cushman, 1910 



152. Spiroplectammina biformis (Parker and Jones) (F 115). 



Twelve stations: 28, 144, 149; WS 32, 33, 41, 42, 46, 348; Drygalski Fjord; MS 14, 68. 



Rare or very rare everywhere, but very good specimens at Sts. 144, 149, WS 32 and 

 41. An exceptionally large specimen at WS 32. The specimens everjrwhere are of the 

 normal type, the very thin form recorded from the Falklands does not occur. 



Genus Textularia, Defrance, 1824 



153. Textularia agglutinans, d'Orbigny (F 116). 

 One station: WS 353. 



A single very small but otherwise typical example from a depth of 4041 m. 



154. Textularia abbreviata, d'Orbigny (F 118). 

 One station: WS 521. 



