TROPICAL. PACIFIC FORAMINLFERA OF ALBATROSS I 



SPIROPLECTAMMINA MILLETTI (Cushman) 



Plate 1, Figures 5 a, 6 



Textularia milletti Cushman, U. S. Nat. Mus. Bull. 71, pt. 2, p. 133, figs. 18, 19 

 (in text), 1911. — Heeon-Allen and Eabland, British Antarctic Exped., 

 Zoology, vol. 6, p. 118, 1922. 



Test compressed, somewhat longer than broad, composed of numer- 

 ous broad, low chambers, the whole test rapidly increasing in width, 

 especially in the earlier portion, end view narrow, periphery acute, 

 each chamber with the outer margin thickened and coarsely arena- 

 ceous, the early portion concave and much less roughened, so that 

 the surface of the test is composed of an alternating series of raised, 

 rough ridges, and smoother depressions; sutures rather indistinct 

 except for the depressions; wall coarsely arenaceous; aperture nar- 

 row at the inner margin of the last-formed chamber, with a slightly 

 overhanging lip. Length, 0.8 mm. 



This species, which has been recorded from a number of stations in 

 the North Pacific and also by Heron- Allen and Earland from the 

 Antarctic, seems to have a wide distribution in the Pacific region. 

 It is nearest to a species described from the Atlantic as Textularia 

 mexicana. The microspheric form shows distinct traces of coiling in 

 the early chambers. 



The species has been recorded by Hofker from the Zuider Zee, but 

 from his figures his species from the Atlantic is not the same as this 

 one, which is well developed in the Pacific. 



Subfamily Textulariinae 



Genus TEXTULARIA Defrance, 1824 



Textularia Defrance, Diet. Sci. Nat., vol. 32, p. 177, 1824. — Cushman, Cushman 



Lab. Foram. Res. Spec. Publ. No. 1, p. 144, 1928. 

 Textilaria Ehbenbeeq, Abh. kais. Akad. Wiss. Berlin, 1839, p. 135. 

 Plecanium Reuss, Sitz. Akad. Wiss. Wien, vol. 44, p. 383, 1861 (1862) (genotype, 



by designation, Textilaria labiata Reuss). 

 Grammostomum (part) of authors. 

 Palaeotextularia Schubert, Pal. Zeitschr., vol. 3, p. 183, 1920 (genotype, by 



designation, Textularia jonesi H. B. Brady). 



Genoholotype. — Textularia sagittula Defrance. 



Test free, elongate, tapering, usually compressed with the zigzag: 

 line between the chambers on the middle of the flattened sides, early 

 chambers in the microspheric form usually planispirally coiled, later 

 biserial, chambers simple, not labyrinthic; wall arenaceous, the rela- 

 tive quantity of cement varying much ; aperture, typically an arched 

 slit at the inner margin of the chamber, occasionally in the apertural 

 face. 



Cambrian to Recent. 



