FAMILY 16. MILIOLIDAE 145 



b. Later chambers more than two in a coil. 



( 1 ) . Aperture simple, with a broad tooth. Nummoloculina. 

 (2) . Aperture cribrate Hauerina. 



c. Later chambers elongate. 



(1). Quinqueloculine stage prominent, uniserial cham- 

 bers few Articulina. 



(2). Quinqueloculine stage reduced, uniserial chambers 

 many, 

 (a). Chambers indistinct, without a tooth. 



Tubinella. 

 (b). Chambers distinct, with a distinct tooth. 



^ Nubeculina. 



B. Test reaching a triloculine stage but not a biloculine one. 



1. Triloculine throughout. 



a. Interior simple, aperture with a simple or bifid tooth. 



Triloculina. 



b. Interior with secondary growth, aperture cribrate. 



Trillina. 



2. Later stages in one plane, not uncoiled Flintina. 



3. Later stages uncoiling and becoming uniserial. Ptychomiliola, 



C. Test reaching a biloculine stage. 



1. Adult biloculine. 



a. Aperture simple with a broad tooth, interior simple. 



( 1 ) . Completely involute throughout Pyrgo. 



(2), Later stages becoming evolute and spiroloculine. 



Flintia. 



b. Aperture cribrate, interior labyrinthic Fabularia. 



2. Adult exterior mostly formed by the last-formed chamber. 



a. Penultimate chamber showing as a small basal area. 

 (1). Aperture of simple radiate form, chamber much 



elongate NevUlina. 



(2). Aperture complex, radiate in form, chamber broadly 

 ovate Idalina. 



b. Penultimate chamber not visible. 



( 1 ) . Test subglobular PerilocuUna. 



(2) . Test strongly compressed Lacazina. 



Genus AGATHAMMINA Neumayr, 1887 



Plate 17, figures 1, 2; plate 19, figure 1 

 Genotype, by designation, Serpula pusilla Geinitz 



Agathammina Neumayr, Sitz. Akad. Wiss. Wien, vol. 95, pt. 1, 1887, 



p. 171. 

 Serpula (part) Geinitz (not Linne), Verst. Deutsch. Zechst. Roth., 



Heft 1, 1846, p. 6. 

 Trochammina (part) of authors. 



