Farquhar. — The Bipolar Theory. 259 



EXPLANATION OF PLATES XX AND XXI. 



Plate XX. 



Figs. 1-4. Acanthochites mariae, n. sp. ; valves 1, 2, 4, 8. 



Fig. 5. „ ,, valve 8, profile. 



Figs. 6, 7. ,, ,, valve 8, another specimen. 



Figs. 9-11. ,, „ interior of valves 1, 4, 8. 



Figs. 12-14. Tornatina oruaensis, n. sp. 



Fig. 15. „ „ another specimen. 



Figs. 16-18. Trochus carmesinus, n. sp. 



Plate XXI. 



Figs. 19-22. Thaumatodon iredalia, n. sp. 



Fig. 23. ,, mira, n. sp. 



Figs. 24, 25. Kdlia bifurca, n. sp. ; right valve. 



Figs. 26, 27. „ „ left valve. 



Fig. 28. „ ,, sculpture. 



Fig. 29. ,, „ hinge of another specimen. 



Figs. 30-32. .Rissoina covlthardi, n. sp. 



Art. XVII.— The Bipolar Theory. 



By H. Farquhar. 



Communicated by Professor H. B. Kirk. 



[Read before the Wellington Philosophical Society, 2nd October, 1907.] 



Since my paper on the evidence for the bipolar theory in the 

 littoral marine fauna of New Zealand* was written I have 

 gathered a few more scraps, which may be taken as supple- 

 mentary. 



Mr. F. Chapman, Palaeontologist to the National Museum, 

 Melbourne, who described the Foraminijera recently dredged 

 up from 110 fathoms off the Great Barrier Island, says, "An- 

 other interesting feature of the present assemblage of Fora- 

 minijera is the presence of a large number of forms which have 

 hitherto been found in dredgings from other, widely removed, 

 areas, generally in the Northern Hemisphere ; and particularly 

 from the colder waters of the Temperate Zone."f 



Three species of marine Bryozoa besides those given in my 

 former paper appear to be common to New Zealand and the 

 North Atlantic — namely, Cellaria fisttdosa, Europe and New 

 Zealand ; Plumatella princeps, identical with or closely allied 



* Trans. N.Z. Inst., vol. xxxix, p. 131. 

 t Trans. N.Z. Inst., vol. xxxviii. p. 77. 



