The Brachiopoda of the Scottish National Antarctic Expedition (1902 to 1904). 

 By J. Wilfrid Jackson, F.G.S., Assistant Keeper, Manchester Museum. Com- 

 municated by Dr W. S. BRUCE. (With Two Plates.) 



(MS. received May 6, 1912. Read June 17, 1912. Issued separately August 28, 1912.) 



The Brachiopoda of the Scottish National Antarctic Expedition of the S.Y. Scotia 

 (1902-1904), though in some cases somewhat scanty in number of individuals, are of 

 particular interest, mainly on account of increasing very materially our knowledge in 

 regard to the geographical range of certain forms, as well as of adding other species to 

 those already known from the Antarctic coast-line. 



Representatives of this class were dredged at three stations, viz. : Station 325 

 (Scotia Bay, South Orkneys), 9-10 fathoms ; Station 346 (Burdwood Bank, south of the 

 Falkland Islands), 56 fathoms; and Station 417 (off Coats Land, Antarctica), 1410 

 fathoms. 



The Scotia Bay dredgings resulted only in the acquisition of one species, which, 

 though possessing certain characteristics of Liothyrina uva, differs in many other 

 respects from that widely distributed form, and may possibly be ultimately regarded 

 as a distinct species. As sufficient material for a complete study is not available, the 

 specimens are referred, in this report, to a new variety of L. uva, viz. notorcadensis. 



At Burdwood Bank were obtained some interesting forms of Terebratella dorsata 

 and Liothyrina uva, both being well-known Magellanic species, as well as some young 

 forms which may possibly represent a new species of Terebratella. 



At this station some interesting examples of a new Cephalodiscus were also 

 dredged, which have provided welcome material in the form of very young stages 

 of Liothyrina uva, as well as of others referable to Terebratella dorsata and 

 Magellania venosa. 



The dredging at Station 417 yielded four forms, all of them being of extreme 

 interest, coming as they do from so southerly a latitude, and from the neighbourhood 

 of the newly discovered Coats Land. 



The species met with here comprise an interesting form of Macandrevia (M. 

 diamantina), hitherto only recorded from the Gulf of Panama and Northern Peru ; 

 Pelagodiscus atlanticus, a typical abyssal form and a species of almost cosmopolitan 

 distribution ; Liothyrina blochmanni, n. sp. ; and some fragmentary remains of an 

 undoubtedly new Rhynchonelloid, unfortunately too imperfect for accurate specific 

 description. These, being deep-water forms, are all thin-shelled animals, and do not 

 attain a very large size. 



It is particularly fortunate that amongst the specimens of Macandrevia dia- 



(REPRINTED FROM THE TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH, VOL. XLVIII., PP. 367-39O.) 



