10 BULLETIN 10 4, UNITED STATES NATIONAL MUSEUM 



Genus AMMOSPHAEROIDINA Cushman, 1910 

 Bull. 104, pt. 2, p. 87. 



Genus AMMOCHILOSTOMA Eimer and Fickert, 1899 



Bull. 104, pt. 2, pp. 84-86. 



Family 20. PLACOPSILINIDAE 



Test attached; chambers numerous and distinct, the early ones 

 often coiled or trochoid, interior simple or labyrinthic; wall are- 

 naceous; apertures of various forms. 



Subfamily 1. Placopsilininae 

 Chambers simple, not labyrinthic. 



Genus PLACOPSILINA d'Orbigny, 1850 

 Bull. 104, pt. 2, pp. 70,71. 



Family 21. ORBITOLINIDAE 

 (Fossil — Palaeozoic to Eocene.) 



Family 22. LAGENIDAE 



Test vitreous, with a glassy luster; chambers simple, neither 

 biserial, trochoid, nor irregularly spiral, planispiral, when coiled; wall 

 calcareous with very fine perforations; aperture typically radiate 

 but in a few genera simple, in the radiate apertured forms with a 

 small chamberlet below the radiate aperture opening into the main 

 chamber by a simple rounded orifice. 



Subfamily 1. Nodosariinae 

 Test multilocular. 



Genus ROBULUS Montfort, 1808 



Genus LENTICULINA Lamarck, 1804 



Genus PLANULARIA Defrance, 1825 



Bull. 104, pt. 4, pp. 101-126. (Under these three genera should be 

 placed the species under Cristellaria except those triangular forms 

 which should be placed under Saracenaria.) 



Genus MARGINULINA d'Orbigny, 1826 

 Bull. 104, pt. 4, pp. 127-132. 



Genus DENTALINA d'Orbigny, 1826 

 Genus NODOSARIA Lamarck, 1812 



