177 



BRACHIOPODA. 



BY J. WILFRID JACKSON, F.G.S., 



* 



Assistant Ki-< /i,-r ,,/' //,, Manchester Mn*i>nn; Hon. Secretary of the Conchological Society of 



(in-ill Britain and Ircliunl. 



WITH ONE PLATE. 



PAOE 



I. Introduction .......... 177 



II. Description of Species 



A. New Zealand Species . . . . . . . . 180 



B. Antarctic Species . . . . . . . . 188 



Bibliography 199 



Index 201 



L INTRODUCTION. 



THE Brachiopoda obtained by the "Terra Nova" Expedition in 1910 form a most 

 interesting and valuable series. They far surpass, both iu number of species and of 

 specimens, the collection brought back by the previous "Discovery" Expedition, and 

 add very considerably to our knowledge of already recorded species. This applies 

 mure especially to certain forms from Antarctic waters, the descriptions of which have 

 hitherto been very incomplete. In one case the excellent material so provided has 

 enabled a fairly complete study to be. made of an Antarctic Rhynchonellid previously 

 ascribed to Rhynchonella. For this form it has been found necessary to create a new 

 genus, viz., Compsothyris. Our knowledge of the geographical range of this and of 

 several other forms has been increased very materially by the "Terra Nova" dredgiugs. 



The "Terra Nova" Brachiopods come from two distinct areas, viz. A. New 

 Zealand, and B. Antarctic (Ross Sea region), and are described under these two 

 headings in the following pages. 



Tin- material from New Zealand was obtained from four stations, and comprises the 

 four well-known New Zealand species, viz.- Hemithyris nigricans (Qovr.) ; Terebratella 

 siiinjii'nii'ii (Leach) [ = <///( ///,/. l>ilhvvn]: Tcrcfiratella rubicunda (Sow.); and Nt'otln/ri* 



VOL. II. '2 K 



