FAMILY 20. PLACOPSILINIDAE 177 



Genus BDELLOIDINA Carter, 1877 

 Plate 22, figures 13, 14 



Genoholotype, Bdelloidina aggregata Carter 

 Bdelloidina Carter, Ann. Mag. Nat. Hist., ser. 4, vol. 19, 1877, p. 201. 



Test attached, of irregular chambers, broad and low, early 

 ones more or less coiled; wall arenaceous, with sponge spicules; 

 apertures numerous, rounded, on the outer face of the chamber. 



Jurassic to Recent. 



Subfamily 2. Polyphragminae 

 Chambers labyrinthic 



Genus HADDONIA Chapman, 1898 



Plate 22, figures 15, 16 

 Genoholotype, Haddonia torresiensis Chapman 

 Haddonia Chapman, Journ. Linn. Soc. London, Zool., vol. 26, 1898, p. 453. 



Test attached, the early chambers often coiled, later ones 

 broad and low; wall arenaceous with coarse pores; aperture, 

 a crescent-shaped slit on the upper face of the last-formed 

 chamber. 



Recent. Tropical. Indo-Pacific. 



Genus POLYPHRAGMA Reuss, 1871 



Plate 22, figures 17, 18 

 Genoholotype, Polyphragma cribrosum Reuss 

 Polyphragvia Reuss, Sitz. Akad. Wiss. Wien, vol. 64, pt. 1, 1871, p. 277. 



Test attached, later portion standing above the attached sur- 

 face, cylindrical, often branched, with short cylindrical 

 chambers, the interior labyrinthic; wall double, the outer aren- 

 aceous and imperforate, inner hyaline and perforate; aperture 

 cribrate. 



Cretaceous. 



