154 FORAMINIFERA 



Genus TRILLINA Munier-Chalmas and Schlumberger, 1893 



Plate 18, figure 9; plate 19, figure 12 

 Genoholotype, Trillina howchini Schlumberger 



Trillina Munier-Chalmas and Schlumberger, Bull. Soc. Geol. France, 

 ser. 3, vol. 21, 1893, p. 118. 



Test similar in plan of development to Triloculina, but with 

 the chambers labyrinthic and the aperture cribrate. 

 Eocene. 



Genus FLINTINA Cushman, 1921 



Plate 18, figure 10; plate 19, figure 13 

 Genoholotype, Flintina bradyana Cushman 



Flintina Cushman, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 465. 

 Miliolina (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 pp. 169, 184. 



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

 quinqueloculine, 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. 



Genus PTYCHOMILIOLA Eimer and Fickert, 1899 

 Plate 54, figures 1-3 



Genoholotype, Miliolina separans H. B. Brady 



Ptychomiliola Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, 



p. 687. 

 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 development in the megalospheric stage at least, and 

 such forms are to be looked for. 



