214 



DISCOVERY REPORTS 



Sub-family SPIRORBINAE 



Genus Spirorbis, Daudin 

 Spirorbis, sp. divers. 



Remarks. There are in this collection about half a dozen bottles containing examples 

 of Spirorbis from various localities. I feel that I am unable to report upon these without 

 undertaking a revision of the whole sub-family, a task which at the moment I cannot 

 attempt. 



O-L 



Fig. 91. Helicostphon btscoeensts . Tube. 



I should like, however, to point out here that the tube (Fig. 91) of Helicosiphon 

 biscoeensis, Gravier (1907, p. 63, PI. v, figs. 49-52), is not, as Gravier supposed, free. 

 It is attached at its narrow base to the substratum, makes two or three sinistral spiral 

 coils and then turning upwards is solute for the rest of its length. The lower portion 

 of the solute part of the tube is strongly fluted, but this fluting disappears apically. 



My examples of Gravier's species are from St. 175, Bransfield Strait, South Shetlands, 

 63° 17' 20" S, 59° 48' 15" W. 200 m. 



