98 DISCOVERY REPORTS 



In Other words, it would appear that the megalospheric form is still undiscovered in the 

 Mediterranean. 



In South Georgia, on the other hand, the megalospheric form, in one or other of its 

 two conditions, occurs in some abundance, though, contrary to the usual rule, it is less 

 common than the microspheric form. 



Dr Lacroix has been so good as to measure the proloculum of some of my specimens 

 and has furnished me with the table on p. 97. (In counting the pairs of chambers those 

 round the proloculum forming the planispire are disregarded.) 



Textidaria tenmssima is no doubt a very widely distributed form, and its discovery 

 may be expected at many localities intermediate between Lacroix's stations off Monaco 

 and our own South Georgian localities. I am now able to record its existence in the 

 Falkland Islands area at WS 93 off West Falkland Island from a depth of 133 m. 

 (TS 503/22), a record omitted from the Falkland Report owing to paucity of material. 

 It also occurs at many Antarctic stations, at some of which the specimens are much 

 larger and even more deserving of the name tenmssima than those from South Georgia. 



157. Textularia nitens, sp.n. (Plate III, figs. 31-5). 



Fifteen stations: 131, 144, 149; WS 33, 41, 42, 47, 63, 334, 343, 348, 373, 428, 429, 523. 



Test very minute and fragile, compressed and leaf-shaped, consisting of five to seven 

 pairs of chambers regularly increasing in size and breadth ; early chambers compressed, 

 later becoming slightly inflated ; marginal edge rounded, slightly lobulate. Aperture a 

 terminal slit parallel to face of test. Wall thin, constructed of minute sand grains, pale 

 gold colour, glistening. Length up to 0-3 mm., breadth 0-13 mm., thickness 0-05 mm. 



This delicate little species, though widely distributed in South Georgia, is very rare 

 everywhere. Its range in depth is considerable (130-3705 m.), but it is most at home 

 and usually attains its best proportions at the shallower stations. Single specimens of 

 this species were noted at a depth of 161 m. at WS 210, to north of Falkland Islands, 

 at WS 433, and at a depth of 1035 m. between the Falkland Islands and South Georgia. 

 These stations were dealt with in the Falkland Report. The species occurs also at 

 several Discovery stations in the Antarctic. 



Genus Bigenerina, d'Orbigny, 1826 



158. Bigenerina minutissima, sp.n. (Plate III, figs. 36-8). 

 Two stations: WS 199, 472. 



Test very minute, rod-shaped, consisting of a large proloculum followed by three to 

 four pairs of long narrow chambers increasing rapidly in size, but very little in width, 

 ending with three cylindrical moniliform chambers and a terminal orifice. Sutures 

 depressed. Constructed of small sand grains, rather large for the size of the organism, 

 embedded in cement on a chitinous membrane. Colour pale brown. Length 0-35 mm., 

 width 0-04 mm. Only a single specimen at WS 199 and a few at 472. The organism is so 

 small that it might easily have been overlooked at other stations. Its structure is not 

 easily seen, unless the specimens are mounted in balsam. 



