260 REPOKT OF NATIONAL MUSEUM, 1^97. 



Ti'St composed of coarse sand graius, etc. — Coutiuucd. 

 Not labyriiithic — Coutiniied. 

 Test adherent. 



Chambers numerous, planoconvex Genns Placopsilma. 



Labyrinthic. 

 Test free. 



Chambers uniserial, straight or curved, never spiral.. Genus Haplostirhe. 



Chambers partly or entirely sjiiral (Jeuus Lituola. 



Test adherent. 



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



pores on eacdi septal face Genus lldtUoidinu. 



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



Chambers one. 



(ilobular with several maminilate ajiertures Genus Thurammina. 



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



extremity Genus Ilippocrepina, 



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



never truly septate (ienus Anuiiodiscus. 



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



Genus fVebhina. 

 Chambers several. 



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



Genus Ifonnosina. 

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



Genus Trochammina. 

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

 Test relatively large, composed of line sand; chambers arranged spirallj' or in con- 

 centric layers ; walls cancellated Subfamily Luftcsin.e. 



Lenticular or snbglobular; chambers numerous, spiral, nautiloid: 



Genus Cyclammiua. 



Fusiform or snbglobular, elongated axially ; chambers spiral Genns 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 Xodosinella. 

 Cyliudrical, attached by one end; chambers lal)yrinthic; aixnturc terminal 



cribrate Genus t'ohjiilirayma. 



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



both sides Genus liivohifina. 



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



chamber Genns Endothyra. 



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



Genus Jiradyina. 



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



berlets Genus IStachvia. 



Family IV. Textularid.e. 



Test tyi)ical]y bi- or tri-serial ; often dimorphous Subfamily Textularine. 



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, 



