FORAMINIFER A— HERON- ALLEN AND EARLAND. 101 



are (a) in the reversal of the spiral of growth after a complete revolution, and 

 (b) the diversion of the line of growth to a direction at right angles with that 

 originally adopted. 



[Hyaline isomorph, Truncatulina variabilis, d'Orb.] 



131. Hajplophragmium nanum, Brady. 



Haplophragmium nanum, Brady, 1879, etc., RRC. 1881, jj. 50 ; 18S1. HNPE, p. 99, isl. ii, 



figs. 1 a-c; 188-1, FC. p. .311, pi. xxxv, figs. 6-8. 

 Trochammina nana, Cusliman, 1910, etc., FNP. 1910, p. 12-3, figs. 190-192. 



Stations 3, 6, 13, 2G, 29, 33, 45, 46, 53, 54. 



This inaequilateral form of the type H. canariense occurs in both areas, but 

 reaches its best development in the most southerly Stations, especially at 

 Stations 53 and 54. It passes by imperceptible degrees into the type in one 

 direction and liy irregular growth into our variety H. canariense, var. variabilis, 

 in the other. 



[Hyaline isomorph, Nonionina boueana, var. janiformis, Rupert Jones.] 



132. Haiilophragmimn crassimargo, Norman. 



Haplofhragmium crassimargo, NorDian, 1892, Museum Normanianum, pt. viii, p. 17 (Note). 



Heron- Allen and Earland, 1910, NBF. p. 424, figs. 3, 4 ; 1913, 

 FNS. p. 130, pi. X, figs. 5, 0; 1914, etc., FKA, 1915, 

 p. 614. 



Stations 26, 38, 40, 45, 46, 48, 50. 



The records are confined to the Antarctic. The general increase in the size 

 of the type species H. canariense as one goes south is probably connected with 

 this distribution, H. crassimargo being inseparable by any specific features other 

 than its comparatively enormous size. It is, however, a convenient taxonomical 

 name. The best Stations are Nos. 26 and 45, at both of which it attained a 

 very large size. The variety appears to be subject to wide abnormalities. Station 

 26 supplied an individual furnished with accessory chambers, developing from 

 the umbilicus. At Station 38 a wild-growing individual isomorphous with H. 

 canariense, var. variabilis occurs. As in the type species H. canariense, the Antarctic 

 specimens are usually very dark in colour, owing to the incorporation of black 

 mineral sand, but at Station 38 specimens of a dark red, owing to the presence of 

 ferruginous cement and an absence of the black sand-grains, were found in com- 

 pany with the dark specimens. 



133. Haplojjhragmium spliaeriloculum (Cushman), 



HaplopJiragmoidcs sphacrilocidum, Cushman, 1910, etc., FNP. 1910, p. 107, fig. 1C5. 

 Haplophragmium „ Sidebottom, 1918, FECA, p. 15, pi. ii, figs. 15, 16. 



Stations 6, 17, 18, 22, 33. 



This is merely a variety of //. canariense, characterized by excessive depres- 

 sion of the sutural lines, thus leading to a spherical inflation of the chambers. 



