DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 263 



Test im'gularly brandling Siiblainily J^aimulimn.k. 



C()ni])()sed of spliiTical or pyriform cliaml>ers, connected by long stoloniferous 

 tubes Genus luonnlhui. 



Family VII. Chilostomellid.k. 



Segments oval, eacli springing from the base of the previous one and entirely envel- 

 oping it Genus EUipnoid'uHt. 



Segments oval, put on alternately at either end of the test (Jenus Chiloslomella. 



Segments alternating at three sides so as to leave exposed portions of two segments 

 and the whole of the final one Genus AUoinorphitKC. 



Family ^'III. Gloiugerinid.e. 



Test a single spherical chamber perforated with large and small foramina: 



Genus Orhiu'ma. 

 Test rotaliform, trochoid or ^lanospiral ; segments few, inflated, coarsely perforate<l : 



( ienus (ilohUjerhm. 

 Test regularly nautiloid and involute; walls thin, finely perforated, spinons: 



Gen us llastujerhi a . 

 Test regularly or obliquely nautiloid and involute; walls thick, smooth, very finely 



perforated Genus I'uUeuiu. 



Test nearly globular, composed of a few coiled segments Genns SpluvroiiUua. 



Test trochoid, segments inflated, finely perforated; aperture consisting of rows of 

 pores along the septal deiiressious (Jeuus Cundiina. 



Family IX. Rotalid.e. 



Test spiral, uonseptate Subfamily Spirillinin.e. 



A complanate, nonseptate tube, free or attached Cienus SpiriUiiia. 



Test spiral, septate, rotaliform; rarely evolute, very rarely irregular or acervuliue: 



Subfamily Rotalin.e. 



Conical; consisting of an external s])iral or annular layer of chambers, the 

 interior of the cone being filled with hyaline substance or by a mass of com- 

 pressed chambers Genns J'atellina. 



Troclioid or complanate, spiral at the apex, later segments often annular or 

 irregular; apertures opening into a deep central Acstibnle, or sometimes con- 

 sisting of sntural pores or bordered foramina Genus Cyiiihaloitova. 



Trochoid or planoconvex, rarely complanate; rather coarsely porous; aperture 

 an arched slit at the umbilical margin of the last segment, often ])rotected bj^ 

 an nmbilical flap Genus Discorhtna. 



Complanate; early segments spiral, later ones cyclical; apertures peripheral: 



Genns Flanorhiilhia. 



Upper side usually more convex than the lower; very finely porous; aperture a 

 large slit at the umbilical end of the inferior sutural margin of the last seg- 

 ment , Genus riilriiiiilhta. 



Lower side usually the more ccmvex; very finely porous; aperture a neatly 

 arched slit near the middle of the inferior sntural margin of the last segment : 



Genus Hoialia. 



Lower side usually the more convex; coarsely porous; aperture near th(> outer 

 end of the final suture, sometimes with a phialine neck. ..(ilenus rriiiicatiilinti. 



Nearly alike on the two faces; coarsely porous (Jenns Anomal'ma. 



Lenticular, iieriphery furnished with radiating spines Genus Val carina. 



Convex or monticulate, adherent; segments few, spreading radially or super- 

 imposed; apei'ture at the end of the final segment Genns Carpentcria. 



Coluuuiar, adherent by a slightly spreading base; segments numerous, spinil; 

 aperture at the inner margin of the final segment (Jeuus Unpertia. 



