Remarks on the Foraminifera. By Prof. T. Ru])ert Jones. 91 



r. Virgulina, D'Orb. 



d, Bifaiina, P. and J. Dimorphous. 



e. Robertiiia, D'Uib. 

 Cassidulina, D'Orb. 



n. Ehrenbergina, Reuss. Dimorphous. 



IV. Textularida. 



Textularia, Defraiice. 



n. Plecanium (sandy), Reuss. 



h. P)igen(riua, D'Orb. Dimorplious. 



c. Spirii])lecta, Ehrenb. Dimorphous. 



d. Gaudryina, D'Orb. Dimorpiious. 



e. Verncuilina, D'Orb. 



/. Tritaxia, Renss. Dimorphous. 



r/. Claviilina, D'Orb. (restricted). Dimorpiious. 



h. Heterostoraella, Reuss. Dimorphous. 



/. Vulvulina, D'Orb. 



j. VeniHna, GiimbeL Dimorphous. 



k. Candeinii, D'Orb. 



I. Ouneolina, D'Orb. 



V. Globigerinida. 



(1.) Glohigeriniiifi. 



Ovulite.s, Lamarck. Monothalnmons. 

 Orbulina, D'Orb. Moiiothalamons usually. 

 Globigerina, D'Orb. 

 PuUenia, Parker and Jones. 

 Sphreroidina, DOrb. 

 Carpenteria, Gray. Fixed. 

 AUomorphina, Reuss."" 

 Chilostomella, Reuss.* 



(2.) BidaUivK 



Spirilliua, Ehrenb. (restricted). Monothalamous. 

 Discorbina, Parker and Jones. 

 Planorbulina, D'Orb. Fixed in some rases. 



n. Planuliuii, D'Orb. 



h. Trimcatulina, D'Orb. Fixed. 

 Pulvinulina, Parker and Jones. 

 Rotalia, Lamarck (restricted). 

 Cymbalopora. Von Hagenow. 

 Thalamopora, Renss. 

 Calcarina, D'Orb. 



Tinoporus, De ^Montfurt (restricted). 

 Patellina, William.sou. 

 Coiiulites, Carter. 

 Polytrema, Ris.so. Fixed. 



(3.) Polystomcl'iivi. 



Polystomella, Lamarck (ri-stricted). 

 a. Nonionina, D'Orb. 



(4.) Nummullnina. 



Nummulina, D'Orb. 



". Operculina, D'Orb. 



'). Assilina, D'Orb. 

 Amphistegina, D'Orb. 

 Heterostegina, D'Orb. 



* The systematic place of these two forms is not well undcrst'iod. 

 VOL. XV. H 



