SYSTEMATIC ACCOUNT 23 



11. Sigmoilina tenuis (Czjzek) (F 40) (SG 23) (A 30). 

 One station: 417. 



A single large and complanate specimen (see A 30). 



Pearcey : as Spirolocidina tenuis, but only outside the convergence. 



12. Sigmoilina sigmoidea (Brady) (A 31). 

 Two stations: 417, 421. 



Rare; the specimens, though typical, are small at St. 417, and very small at St. 421. 



Subfamily KERAMOSPHAERINAE 

 Genus Keramosphaera, Brady, 1882 



13. Keramosphaera murrayi, Brady (Plate I, figs. 7-9). 



Keramosphaera murrayi, Brady, 1882, K, pp. 242-5, pi. xiii, figs. 1-4; 1884, FC, pp. 224-7, 



text-figs. 8 a-d on p. 225. 



K. murrayi, Pearcey, 1914, SNA, p. 996. 



K. murrayi, Wiesner, 193 1, FDSE, p. iii, pi. xvii, figs. 199-200. 



Two stations: 313, 417. 



A single perfect specimen, and a fragment showing the internal structure, were found 

 at St. 313 ; also a single fairly good specimen at St. 417, which had evidently been built 

 into the wall of a worm tube or other organism. They are all undersized and probably 

 young individuals. 



The perfect specimen from St. 313 is 1-5 mm. in diameter as compared with 2-5 mm., 

 the size given by Brady for the type. The specimen from St. 417 is approximately the 

 same size. Pearcey does not record the size of the Scotia specimen. Of Wiesner's two 

 specimens, judging by the photographs, one is slightly larger than the type, the other 

 rather smaller. They were obtained at Gauss St. 83, 3410m., "sandy glacial mud" 

 (65° 15' S, 80° 19' E). 



Pearcey: "A perfect specimen among the material from St. 420, 2620 fathoms, in the 

 Weddell Sea, outside the diatomaceous zone, in a terrigenous deposit of glacial mud 

 containing but a trace of carbonate of lime." He also records the information that three 

 additional specimens had been found in material from the original Challenger Station 

 157 (53° 55' S, 108° 35' E, 1950 fathoms), subsequent to the publication of the 

 Challenger report, making in all five Challenger specimens. There should therefore 

 now be in existence eleven specimens: 



Five from the 'Challenger'. 



One from the 'Scotia' (Pearcey), whereabouts unknown. 



Three from the 'Scotia' (A.E.) in Royal Scottish Museum, Edinburgh. 



Two from the ' Gauss ', presumably in the Zoological Museum of the University of 

 Berlin with the other Gauss specimens. 



The known range of Keramosphaera now extends from 41° 20' W (Scotia St. 313) to 

 108° 35' E (Challenger St. 157) between latitudes 53° 55' S (Challenger) and 71^ 22' S 

 (Scotia St. 417), an enormous area at present little known. Though unquestionably a 

 rare form, I think it is likely to be found whenever suitable material is obtained from 



