260 REPORT OF NATIONAL MUSEUM, 1897. 



Test composed of coarse sand grains, etc. — Continued. 

 Not labyrinthic — Continued. 

 Test adherent. 



Chambers numerous, planoconvex Genus Placopsilina. 



Labyrinthic. 

 Test free. 



Chambers uuiserial, straight or curved, never spiral. Genus Haplostiche. 



Chambers partly or entirely spiral Genus Lituola. 



Test adherent. 



Chambers linear, vermiform, closely approximated; apertures a row of 



pores on each septal face Genus Bdelloidina. 



Test composed of fine sand, smooth externally .Subfamily Trochamminin.k. 



Chambers one. 



Globular with several inammilate apertures Genus Thurammina. 



Elongate, conical, with a large curved or irregular aperture at the basal 



extremity Genus Hippocrepina. 



A single tube coiled upon itself in various ways; sometimes constricted, 



never truly septate Genus Ammodiscua. 



Adherent, hemispherical, with or without a long slender tubular neck: 



Genus Wvbb'nut. 

 Chambers several. 



United in a, straight or curved line; rarely a single chamber: 



Genus Hormosina. 

 Rotaliform, nautiloid, or trochoid; more or less distinctly septate: 



Genus J 'rock amm in a . 

 Rotaliform; test composed of fusiform calcareous spicules. .Genus Carterina. 

 Test relatively large, composed of tine sand; chambers arranged spirally or in con- 

 centric layers ; walls cancellated Subfamily Loftusin^e. 



Lenticular or subglobular; chambers numerous, spiral, nautiloid: 



Genus Cyclammina. 



Fusiform or subglobular, elongated axially; chambers spiral Genus Loftusia. 



Spheroidal, compressed; chambers in concentric layers Genus Parkeria. 



Test more or less calcareous; distinctly septate; exclusively fossil: 



Subfamily Endotiiyrin.e. 

 Nodosariforin ; chambers sometimes slightly labyrinthic ; aperture simple : 



Genus Nodo8inella. 

 Cylindrical, attached by one end; chambers labyrinthic; aperture terminal 



cribrate Genus Polyphragma. 



Lenticular, consisting of a plauospiral tube with a deposit of shell substance on 



both sides Genus Involutina. 



Nautiloid or rotaliform; aperture simple, at the inner margin of the final 



chamber Genus Endothyra. 



Nautiloid; aperture a number of pores on the face of the terminal chamber: 



Genus Bradyina. 



Adherent; consisting of numerous subdivided segments, or of a mass of cham- 



berlets Genus Stacheia. 



Family IV. Textularid.h. 



Test typically bi- or tri-serial; often dimorphous Subfamily Textularin^e. 



Monomorphous. 



Segments alternating, in two rows. 



Aperture an arched slit at or near the inner angle of the last segment: 



Genus Textularia. 

 Test compressed at right angles to the normal plane.. .Genus Cuneolina, 



