BRACHIOPODA JACKSON. 1 7!> 



whicli, in addition to being stronger shelled, are also more brilliantly coloured. They 

 belong to the Antarctic /one ((Uncial district) as defined by Regan in his Report mi 

 tlic Fishes (if the "Terra Nov.'i " Kxpedition. Fossil ilv all will ultimatelv lie found 

 io have a circumpolar distribution. 



From the above summary it will he seen that no new forms are added to the list of 

 species known to occur in Antarctic waters; luit on the other hand certain species are 

 aliscut. These are: Pelagodiscus /it/<nifi<-ti* (King), l^'m/lii/riim blochmanni, Jackson, 

 ami Miii'iiinl ricin <li<iiii<tntiini, Dall, all three dredged in 1,410 fathoms, oil' Coats 

 Land ("Scotia" Expedition); Miifitinln rin i-itit/iii/feni, Blochmaiin, Kastern Antarctic 

 ("(Jauss" Expedition); ('nil/in AvW///V/ ; .louliin, Western Antarctic (" Belgica '' Ex- 

 pedition); Liiitlii/i-,'llit iir<t (I>rod.) var. notarcadciw*, Jackson, South Orkneys ("Scotia" 

 Expedition), South (Jeorgia (Swedish Expedition), and Western Antarctic (French 

 Expedition). The above localities, like those of the Ross Sea area, all lie inside the 

 extreme limit of pack-ice. Of Antarctic species living outside the limit, four have 

 lieen recorded from Kerguelen Island, viz., Ili-mitlii/rix />i/.i-iil<i/it (Watson. MS., 

 Davidson) (" Challenger " Expedition): I.it]ii/rin<i inos,-l,-i/i (\ )avidsoii) ("Challenger" 

 Expedition); Terebratella enzenspergwi, Bloelimann ("(Janss" Expedition, and 

 erroneously as '/'. i/<>rxnf<t ((imel.), '' Challenger " Expedition) ; and Nnij<ll<inl<t 

 kerguelenensis (Davidson) ("Challenger" and "(iauss'' Expeditions). 



Excepting Pelagodiscus it//<tnf!<-iix, a typical abyssal form and a species of almost 

 cosmopolitan distribution,* Mm-iinili-i'v'ni diamantina is the only species whicli ranges 

 any considerable distance outside Antarctic- waters. This species was originally 

 described from specimens taken in deep water in the Oulfof Panama, and was again 

 met with in deep water off Northern Peru. The highly interestinu' discovery in the 



1 O */ o ** 



Antarctic of adult and very young specimens of this member of the Dallininse, a 

 sub-family previously thought to have been restricted to boreal seas, is discussed in 

 detail in my " Scotia" Report [Jackson, 1912, pp. 37 ( J-:;8:-.]. 



I'icfore proceeding with the descriptions of the "Terra Nova " species, I must here 

 express my thanks to Mr. D. G. Lillie for his kindness in supplying the surface 

 temperatures of the sea in the ease of most of the species. He remarks that in the 

 Antarctic region the bottom temperature is approximately either just below or just 

 above o C. ( = 32 F.). 



I have also to thank Dr. S. F. Ilarmer, Keeper of Zoology in the British Museum 

 (Natural History), for entrusting me with this Report, and Mr. <!. ( '. Robson. Assistant 

 in charge of the Braehiopoda in the same institution, for supplying me with necessary 

 information. 



A bibliography of the principal works consulted in the preparation of this Report 

 is 'jiveii at the end. 



* Two lurvjf (Ircck'ccl liy tin- ' ( Saiiss " Kxpeilitimi in the Kustrrn Aiitmvtic- are probably referable 

 to tliis species. (.SV.- Eirlik-r. I'.U 1. \>. s7.) 



2 K -2 



