FORAMINIFERA OF THE ATLANTIC OCEAN 67 



Test in the early stages, at least of the microspheric form, qiiin- 

 queloculine, followed very early by a triloculine stage and in the adult 

 planispiral, usually taking three chambers to make a complete cycle; 

 aperture with a large orifice with a thickened border and large 

 complex tooth. 



Recent. 



This genus is well developed in the Indo-Pacific, especially in the 

 Phillippine region where there are some large species. 



Genus PTYCHOMILIOLA Eimer and Fickert, 1899 



Ptychomiliola Eimer and Fickert (Genoholotype, Miliolina separans H. B. 

 Brady), Zeitschr. Wiss. Zool., vol. 65, 1899, p. 687. — Cushman, Special 

 Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 154. 



Miliolina (part) H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 45. 



Test in the early stages triloculine, completely involute, in the later 

 stages with the chambers uncoiling, and in fully developed specimens 

 with the last chambers tending to become uniserial; aperture with a 

 distinct tooth, typically bifid. 



Recent. Shallow waters of the tropical Indo-Pacific. 



This genus develops from such forms as Flintina by adding the 

 loosely coiled development followed by a uniserial stage in the final 

 development. The next stage would be a completely uncoiled devel- 

 opment in the megalospheric stage at least, and such forms are to be 

 looked for. 



PTYCHOMn.IOLA SEPARANS (H. B. Brady) 



Plate 17, Figures 6-8 



Miliolina separans, H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 175, pi. 7, figs. 1-4. — Egger, Abhandl. kon. bay. Akad. Wiss. Miinchen, 

 CI. II, vol. 18, 1893, p. 239, pi. 2, figs. 53, 54.— Flint, Ann. Rep. U. S. 

 Nat. Mus., 1897 (1899), p. 300, pi. 46, fig. 6.— Bagg, Proc. U. S. Nat. Mus., 

 vol. 34, 1908, p. 121.— Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 

 1914, p. 1038. 

 Ptychomiliola separans Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 

 1899, p. 687, text figs. 

 This species with its peculiar uncoihng is known only from shoal 

 water of the Indo-Pacific, except for the one record of Pearcey from 

 the Abrohlos Bank off Brazil. 



Genus PYRGO DeFrance, 1824 

 Pyrgo DeFrance (Genoholotype, Pyrgo laevis DeFrance), Diet. Sci. Nat., 

 vol. 32, 1824, p. 273.— Cushman, Special Publ. No. 1, Cushman Lab. 

 Foram. Res., 1928, p. 155. 

 Miliola (part) Lamarck, Ann. Mus., vol. 5, 1804, p. 351. 

 Biloculina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 297 (genotype, by des- 

 ignation, B. bulloides d'Orbigny). 



Test with the early chambers at least in the microspheric form 

 quinqueloculine, followed by a triloculine series, and in the adult 

 added in planes 180° apart and involute, the interior simple, the 



