FOEAMINIFERA OF THE XOETH PACIFIC OCEAN. 63 



much less distinct. In his figure of the apertural face there is a 

 single large opening surrounded by numerous papillae, which are 

 probably pores. Our recent species seems to be essentially different 

 from that described by d'Orbigny in all its particulars. It is 

 apparently a species of the tropical Indian and Pacific Oceans, with 

 a possible extension to the Mediterranean from the data given by 

 Sidebottom. 1 His specimens are very interesting and may be but a 

 form of this species, as is suggested by him. Egger 2 records a 

 thicker, more robust form from Mauritius. Millett records the 

 species from the Malay Archipelago. 



HAUERINA CIRCINATA H. B. Brady. 



Plate 23, figs. 3, 4. 



Hauerina circinata H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 47; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 191, pi. 11, figs. 14-16 — 

 Rhumbler, Zool. Jahrb., Abteil. Syst., vol. 24, 1906, p. 52, pi. 3, fig. 40. 



Description. — "Test nautiloid, thin, complanate; composed of two 

 or three convolutions, the last of which, consisting of six or seven 

 segments, completely incloses those previously formed; segments 

 arched, thin and rounded at their peripheral margins; sutural lines 

 marked by external constrictions. Color milky white, sufficiently 

 translucent to show the outline of the inner whorl of chambers. 

 Aperture consisting of a number of perforations distributed irregu- 

 larly over the septal face of the terminal segment. 



" Diameter, one twenty-fifth inch (1 mm.)." 



Distribution. — Rhumbler gives the only record for this species in 

 the North Pacific, two specimens from Laysan Island. Brady's 

 material was from shallow-water dredgings among the islands between 

 Australia and Borneo. 



From the figures and description given by Brady it seems as though 

 this species was very different in its essential characters from typical 

 Hauerina except in the matter of the aperture. Neither the figure 

 nor the description give any light in regard to the structure and 

 arrangement of the early chambers. 



HAUERINA ORNATISSIMA (Karrer). 



Plate 23, figs. 1, 5. 



Quinqueloeulina ornatissima Karrer, Sitz. Akad. Wiss. Wien, vol. 58, 1868, p. 151, 

 pi. 3, fig. 2.— H. B. Brady, Quart. Journ. Micr. Sci., vol. 16, 1876, p. 406. 



Hauerina ornatissima H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 192, pi. 7, figs. 15-22.— Millett, Journ. Roy. Micr. Soc, 1898, p. 610.— 

 Rhumbler, Zool. Jahrb., Abt. Syst., vol. 24, 1906, p. 53. 



i Mem. and Proc. Manchester Lit. qnd Philos. Soc, vol. 48, 1904, No. 5, p. 19, pi. 5, figs. 7, 8, text fig. 

 8; vol. 54, 1910. No. 16, p. 6. 

 2Abhand. kong. bay. Akad. Wiss. Miinchen, CI. u, vol. 18,1893, p. 244, pi. 3, figs. 9, 10, 23, 24. 



