132 MR F. GORDON PEARCEY ON 



Reophax nodulosa, H. B. Brady. 



This beautifully built form, one of the largest species amongst recent arenaceous 

 Foraminifera, is represented in the Scotia collection from seven stations, viz. 301, 313, 

 416, 417, 418, 420, and 447. At Station 417 it was in great numbers and of very 

 large dimensions, several specimens measuring more than one inch in length, and girth 

 in proportion, the finest I have ever seen. This species has practically a world-wide 

 distribution and a great range in depth, from comparatively shallow water to 

 3950 fathoms. 



Reophax robustus, sp. nov. (Plate I. figs. 6-10.) 



Test straight ; composed of few (two to four) chambers or segments ; chambers 

 spherical, last chamber generally somewhat elongated, each much larger than its pre- 

 decessor ; with a well-formed and firmly constructed tubular orifice ; walls composed of 

 very coarse sand-grains, compactly built, and beautifully ornamented externally with 

 large angular mineral particles, such as quartz, felspar, magnetite, garnet, zircon, and 

 hornblende, giving a beautiful but very robust appearance to the whole structure. 

 Length, y 1 ^- to ^ inch. 



Reophax robnstum may be noted as one of the most beautiful members of the genus ; 

 it is readily recognised by its robust appearance and body-colour, which is of a yellowish 

 gray. This is broken up, however, by the variously coloured minerals which stand out 

 prominently from the walls, in which they are firmly cemented by a light yellow-brown 

 siliceous cement. 



The interior of the chamber walls is smooth or nearly so, but appears to possess 

 little or no chitinous lining. The simple tubular apertures are of a bright ferric-brown 

 colour, which stands out conspicuously at the distal end of each chamber, where they 

 terminate in a drawn-out tubular neck, giving the test a beautifully finished appearance. 



Reophax robustum is one of the most abundant species obtained at Station 420, 

 2620 fathoms, but it was not found in the material from any of the other localities. 



Reophax dentalinifot'mis, H. B. Brady. 



Obtained in its typical form at Stations 313 and 447, but rare. This species has a 

 fairly wide distribution in the depths of most of the great ocean basins. 



Reophax membranacea, H. B. Brady. 



This little, delicate, semi-chitinous form was found, rare, at Station 313. It is 

 exclusively a deep-sea species, and comparatively rare, ranging in depth from 1775 to 

 3950 fathoms. 



Reophax scorpiurus, Montfort. 



A very common cosmopolitan species, but apparently sparing!}' distributed in 

 Antarctic Seas. Found only at Station 342. Obtained by the Challenger off Heard 

 Island, in 75 fathoms. 



(ROY. soc. EDIN. TRANS., VOL. XLIX., 100G.) 



