FORAMINIFEEA OF THE NORTH PACIFIC OCEAN. 27 



is usually distinctly broader than that portion showing the lacunose 

 ornamentation. As Brady had the species from but the one station 

 and the number of specimens is not hinted at it seems reasonable to 

 suppose without further data that the Challenger specimens were 

 imm ature and did not show the full specific characters which the 

 Albatross specimens show. 



The Albatross specimens are also much larger than the measure- 

 ments given by Brady but the lacunose portion usually does not 

 exceed 1 mm., another fact which seems to substantiate the idea 

 that the Challenger material was immature. 



In specimens which have a broadened last coil there is a tendency 

 to lose the ornamentation progressively as in certain species of 

 CristeUaria. The prominent striae are retained on the inner border 

 of the chamber, while the peripheral portion is nearly if not quite 

 smooth. 



Altogether these form a decidedly interesting suite of specimens. 



In connection with the present material it is worthy of note that 

 Chapman has figured a specimen from the Tertiary of Victoria as 

 Cornuspira striolata Brady, 1 which has very close affinities with the 

 Japanese material. One or two of our specimens have just such a 

 terminal portion as that figured by Chapman and the early chambers 

 while indistinct in that figure seem to be rather coarsely striate or 

 even lacunose. As the original specimens of C. striolata from the 

 Faroe Channel had a very highly developed peripherally expanded 

 test and those of Goes also from the subarctic waters had a similar 

 form it seems as if we had here in the Indo-Pacific region a definite 

 species, the range of which may probably be found to be from Aus- 

 tralia northward to Japan and existing as a fossil in the Tertiary at 

 least of Australia. 



The large recent specimens which show the expanded last coil are 

 microspheric, and it may be that the megalospheric form does not 

 have the later stages. Brady's figure of C. lacunosa seems, compared 

 with our specimens, to be megalospheric and stops at this point in its 

 development. 



Genus OPTHALMIDIUM Zwingli and Kubler, 1870. 



Oculina Kubler and Zwingli (type, 0. porosum Zwingli and Kubler), Neu- 



jahrsblatt Burgersbibl., Winterthur, 1866, p. 11. 

 Opthalmidium Zwingli and Kubler, Foram. Schweiz Jura, 1870, p. 46. — 



H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 188. 

 Hauerina H. B. Brady (part), Quart. Journ. Micr. Sci., vol. 19, 1879, p. 54. 



Description. — Test in general planospiral, compressed, all chambers 

 visible from the exterior on both sides, proloculum globular, fol- 

 lowed by a coiled second chamber making usually two or more coils, 



» Journ. Linn. Soc. Zoology, vol. 30, 1907, p. 23, pi. 3, fig. 47. 



