368 J. WILFRID JACKSON ON 
manting are examples which have afforded the much-desired opportunity for studying 
the developmental stages of the loop. 
With regard to Pelagodiscus atlanticus, although of almost world-wide distribution, 
its probable existence in Antarctic waters has only recently been demonstrated by 
KICHLER (1911),* who, with some hesitation, refers to this species two larval forms of 
a Discinesca obtained in March 1903 by the “Gauss” Expedition, at a depth of 
about 1640 fathoms in the neighbourhood of their winter station, Kaiser 
Wilhelmland II. 
Although it is, to some extent, a matter for regret that this report is so late in 
its publication, owing to the material having only recently come into my hands for 
study, the long delay has not been without its compensations, as I have been able 
to derive some benefit from, and make comparisons with, collections made by other 
Antarctic expeditions whose reports are already published. 
Before proceeding with the detailed description of the species I must here express 
my great indebtedness to the numerous friends who have assisted in one way or 
another during the preparation of this report. 
To Dr F. Brocumann, of Tiibingen University, I am especially indebted for his 
very material help in the discrimination of critical forms, and for his kind interest and 
valuable assistance. To Dr W. H. Dati I am also grateful for his great kindness and 
confidence in submitting to mea type specimen of his Macandrevia diamantina for 
comparison with the Macandrevia obtained in 1410 fathoms off Coats Land. Amongst 
the various friends who have assisted in sorting out the smaller Brachiopoda from the 
Burdwood Bank material, I wish to particularly mention my colleague Mr hk. Sranpen, 
the Rey. L. J. SHackieForD, and Messrs B. R. Lucas, F.G.S., and F. G. PEarcry. 
And in conclusion I must tender my sincere thanks to Dr W. S. Brucs, F.R.S.E., for 
entrusting his Brachiopod collections to me, and for placing maps and much general 
information at my disposal. 
List of species contained in the Scotia collections :— 
Class BRACHIOPODA. 
Pelagodiscus atlanticus (King), off Coats Land, 1410 fathoms. 
Hemithyris, n. sp., off Coats Land, 1410 fathoms. 
Tnothyrina uva (Brod.), Bardwood Bank, 56 fathoms. 
‘ var. notorcadensis, nov., Scotia Bay, South Orkneys, 9-10 fathoms. 
L. blochmanm, un. sp., off Coats Land, 1410 fathoms. 
Macandrevia diamantina, Dall., off Coats Land, 1410 fathoms. 
Terebratella dorsata (Gm.), Burdwood Bank, 56 fathoms. 
Z n. sp.?, Burdwood Bank, 56 fathoms. 
Magellania venosa (Sol.), Burdwood Bank, 56 fathoms. 
* See bibliography at end of report. 
