260 REPORT OF NATIONAL MUSEUM, 1897. 



Test composed of coarse sand grains, etc. Continued. 

 Not labyrinthic Continued. 

 Test adherent. 



Chambers numerous, planoconvex Genus Plaeopsilina. 



Labyrinthic. 

 Test free. 



Chambers uniserial, 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 IklcUoidlna. 



Test composed of fine sand, smooth externally Subfamily TROCIIAMMININ.E. 



Chambers one. 



Globular with several maminilate 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 Ainittodixcus. 



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



Genus Webbina. 

 Chambers several. 



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



Genus Honnosina. 

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



Genus Trochammina. 



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

 Test relatively large, composed of fine 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 ENDOTHYRIN^E. 

 Nodosariform ; chambers sometimes slightly labyrinthic ; aperture simple : 



Genus Nodos'mella. 

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



cribrate Genus Polyplwagma. 



Lenticular, consisting of a planospiral 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 Bradylna. 



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

 berlets Genus Stachda. 



Family IV. TEXTULARID.E. 



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, 



