94 "TERRA NOVA" EXPEDITION. 



108. Reophax advena, Cushman. PL III, figs. 6, 7. 



Reophax advena, Cushman, 1919, RFNZ. p. 599, pi. Lsxv., fig. 2. 



Stations 38, 45, 47, 53, 54, 55. 

 At a few Antarctic Stations specimens occur of a large, coarsely constructed 

 form, which we have ventivred to refer to Cushman's species on the ground of 

 some points of similarity, although om- specimens present features which are not 

 referred to in his description. The specimens commence with a large primordial 

 chamber, followed by two to four chambers either in a straight line or in a 

 curve, suggesting relationship with Haplo'phragmium. The colour varies. At the 

 most southerly stations they are very dark owmg to the constituents, Ijut at 

 northern stations the natm-al colour is seen, deep bro^^^l at the primordial, owing 

 to the presence of cement, the coloiu' decreasing towards the later-formed 

 chambers. 



In most of the specimens the final chamber is seen to be very loosely con- 

 structed, without much cement, the sand-grains being separated, and when this 

 loosely constructed layer is broken, the interior of the chamber is foimd to be 

 labyrinthic, but the labyrinthic structure seems to be confined to the last formed 

 chamber whilst in process of constrviction, for a section through an adult shell 

 shows that the earlier chambers are non-labyrinthic. Very young specimens 

 consisting of only two chambers are difficult to identify, except by association 

 with adults ; in external appearance they are practically indistinguishable from 

 double individuals of Saccammina sphaerica. 



109. Reophax dentaliniformis, Brady. 



Reo])hax dentaliniformis, Brady, 1879, etc., RRC. 1881, p. 49: 1884. FC. p. 293. pi. xxx, 



figs. 21, 22. 

 Cushman, 1910, etc., FNP. 1910, p. 87, fig. 121. 



Stations 29, 38, 40, 45, 46, 49, 50, 52, 53. 



Confined to the Antarctic and increasmg in development and size as we 

 proceed fiulher south. The best specimens at Stations 49, 50 and 52, especially 

 the last. All very dark in colour owing to the incorporation of basaltic sand. 



110. Reophax bacilluris, Brady. 



Reoplwx hfuillaris, Brady, 1879, etc., RRC. 1881, p. 49 ; 1884, FC. p. 293, pi. xxx, figs. 23, 24. 

 Cushman, 1910, etc., FNP. 1910, p. 86, fig. 120. 



Station 45. 



A single typical specimen. The septation of the chambers in the earlier 

 half of the shell is obscure, and there are only four chambers in the latter half. 

 The aboral end is thick ami romided, and the apertm-e opens on the face of 

 the last chamber, and is not produced on a neck, as in the type. 



[Hyaline isomorph, Nodosaria pauperata, dOrb.] 



