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EXPLANATION OF PLATES 
Puate I, 
Figs. 1-3. Liothyrina wva (Brod.), var. notorcadensis nov.—Scotia Bay, South Orkneys ; 9-10 fathoms. 
Fig. 1. Dorsal view showing labiate prolongation of foramen over dorsal umbo ; also vermiform groovings 
caused by Cliona or perforating Polyzoa. Slightly above natural size. 
Fig. 2. Side view of same example. 
Fig. 3. Interior views of both valves of same example as fig. 1, showing brachial support (broken) and 
position of teeth. 
Figs. 4-8. Leothyrina blochmannt, n. sp.—Station 417, off Coats Land; 1410 fathoms. 
Fig. 4, Dorsal view of type-specimen. x 14, 
Fig. 5. Side view of same example. x 1k. 
Fig. 6. Interior views of both valves of same example, showing the weak character of the brachial support, 
also position of teeth. x 14, 
* According to BucKMAN (1910), 1896 is date of off-print, 1900 date of volume. 
