DESCRIPTIVE CATALOGUE OF RECENT FOKAMINIFERA. 259 



Family II. Astrokhizid.k. 



Walls thick, composed of sand or iniid, slightly temented. . Subfamily Astkokiiizin.k. 

 Ft\siforiii, hranchiug, or liattened with angular or radiate margin; aperture at 



thi' fiid of each ray or branch Genus Aatrorhiza. 



More or less tlask shaped or subcylindrical; aperture single, terminal: 



Genus Peloaina. 

 Subglobiilar, very irregular externally; a|)ertures numerous, in horn-like pro- 

 tuberances Genus Storthosphar<i. 



Columnar, branching, or irregularly outspread; adherent; apertures terminal: 



(jJenus Dendvophnja. 

 A rounded mass of radiating, branching tubes arranged in more or less distinct 



layers Genus Surbmamminu. 



Walls thick, composed of felled sponge spicules and fine sand, uucemented: 



Subfamily Pilulinin.e. 



Spherical ; a])erture a long, curved slit Genus Pihtlhia. 



Subspherical, labyriuthic or cavernous, or having a central undivided cavity with 



subcaveruous walls; no general aperture Genus Crithionina. 



Oval or subcylindrical; aperture typically a rouudi'd oriiice at one end: 



Genus TevhiiilcUa. 



Cylindrical, long, slightly tapering, open at botli ends Genus Uatliiisiphon. 



Walls thin, composed of sand grains tirmly cemented; test nearly spherical: 



Subfamily Saccamminin.e. 



A single globular diamber, without general aperture Genus rsammosjyhara. 



A number of adherent globular cliambcrs, without general aperture: 



(ienus Soros2)hara. 

 One or several globular, pyriform or fusiform clianibers, with or without tubular 



connection ; apertures distinct Genus Saccammina. 



WaLs composed of lirmly cemented sand grains, often mixed with sponge spicules; 

 test tubular, sometimes imperfectly segmented. .Subfamily Kiiabdamminin.e. 



Elongate, tapering, simple; aperture at the broad end Genus Jaciilella. 



Elongate, cylindrical, simple or branched; aperture at one end, the other end 



rounded, sometimes inflated Genus Hjipcrummina. 



Fusiform or cylindrical, largely composed of sponge spicules; aperture at each 



end Genus Marsipella. 



Rectilinear, radiate or branching, with or without a central chamber; apertures 



at the ojien ends of the tubes Genus Hhabdammhut. 



Very variable, usually consisting of irregular inflated sacs, single or united; 



apertures multiple, tubulated Genus AsclicmoiieJIa. 



Tubular, slender, flexible, simple or branched, chitino-arenaceous, in nonadher- 

 ent masses Genus llhizammina. 



Tubular, branching, reticulated, adherent to the surface of shells or stones; 



apertures terminal Genus Safieuella. 



Subcylindrical, adherent at one end, rounded at the other, constructed of loose 



sand grains; imperfectly se})tate Genus BoteUina. 



Columnar, straight or crooked, adherent by an expanded base, enlarging or 

 branching toward the apex; aperture terminal Genus HaUphij>icmu. 



Family III. Lituolid.i:. 



Test composed of coarse sand grains, rough externally Subfamily Lituolin.e. 



Not labyrinthic. 

 Test free. 



Chambers one, or several united in a straight, curved, or irregular line, 



never spiral Genus Ueophax, 



Chambers numerous, partly or entirely spiral. ..Genus Ilaplophnujmiinn. 



