NO. 5 FORAMINIFERAL GENERA — LOEBLICH AND TAPPAN I3 



This specific name could not be thus used, however, as it had been 

 previously used by Montagu for the species Miliolina ohlonga, and as 

 this species had been earlier placed, even though erroneously, in the 

 genus Miliammina, the name was not available for another species of 

 the same genus. Thus the South Georgia form lacks a specific name, 

 and we here propose the new name Miliammina earlandi, for M. 

 ohlonga Heron-Allen and Earland (1933, p. 92). 



The large specimen here figured (B.M.N.H. No. ZF 3406) is here 

 designated lectotype and is from 200 meters, off South Georgia, R.R.S. 

 William Scoreshy station 43, lat. 54° 54' S., long. 36° 50' W. The 

 sectioned specimen (ZF 3407) is from R.R.S. William Scoreshy sta- 

 tion 50, from 230 meters, lat. 54°3o'3o" S., long. 38°4o'3o" W., off 

 South Georgia. 



Discussion. — Cushman (1948, p. 174) stated that Miliammina is 

 planispiral in the early stages. This statement is apparently based on 

 a misinterpretation of the figured sections of Heron- Allen and Earland 

 {in Earland 1933, pi. 5, figs. 7, 8), which were cut in the long axis of 

 the test and not transversely. The transverse section here figured 

 (fig. 16) shows that this genus is definitely quinqueloculine in plan. 



Originally Heron- Allen and Earland included in Miliammina species 

 with either a quinqueloculine or triloculine chamber arrangement. We 

 are here emending Miliammina to include only those species which, like 

 the type species, are quinqueloculine. The triloculine species are here 

 separated in a new genus, Trilocularena. 



TRILOCULARENA Loeblich and Tappan, new genus 



Plate 2, figure i 



Type species. — Miliammina circularis Heron-Allen and Earland, 

 1930, Journ. Roy. Micr. Soc. London, ser. 3, vol. 50, p. 44, figs. 18-21. 



Derivation. — tri L., ih.rt&-\- locidus L., cell, dim. of locus + harena 

 1^. = arena, sand. Gender, feminine. 



Diagnosis. — Test free, chambers arranged in a triloculine plan; wall 

 arenaceous, composed of minute mineral grains in an excess of sili- 

 ceous cement, surface smoothly finished; aperture terminal, with a 

 broad, shallow tooth formed by an extension of the lip. 



Types. — Heron-Allen and Earland selected no holotype for their 

 species. The specimen here figured, B.M.N.H. No. ZF 3563, is here 

 designated as lectotype, and the remaining specimens (ZF 3567) are 

 paratypes. These are from Discovery station D 182, Schollaert Chan- 

 nel, Palmer Archipelago, Antarctica, lat, 64°2i' S., long. 62°58' W., 

 at a depth of 2y8 to 500 meters. Heron-Allen and Earland also 



