108 THE PROTOZOA 



Subfamily 3. Endothyrince . The shell is more calcareous and less sandy than in 

 the other Lituolida, and the septa between the chambers are distinct. Genera : 

 Nodosinella Brady ; Endothyra Phillips ('46) ; Polyphragma Reuss ; Bradyina 

 Moll. ('78) ; Stacheia Brady ('76). 



Subfamily 4. Loftusintz. The shell is large, lenticular, spherical, or fusiform, and 

 deposited either in concentric layers or spirally. The chambers are occupied 

 to a large extent by an excessive enlargement of the arenaceous cancellated wall. 

 Genera : Cyclammina Brady ('76) ; Loftusia Brady ('69) ; Parkeria Carpen- 

 ter ('69). 



Suborder 3. PERFORINA. The shell wall is perforated by numerous minute open- 

 ings through which the pseudopodia can pass as well as through the main 

 openings. 



Family 5 . Textularidae. The shells of the larger species are arenaceous, either with 

 or without a calcareous matrix ; the smaller forms are hyaline and conspicuously 

 perforated. The chambers are arranged in alternating series, spirally or without 

 apparent order. 



Subfamily 1. Textularina. The shells are typically bi- or tri-serial, and are often 

 dimorphous. Genera : Textularia Dufrance ('28) ; Bigenerina d'Orb. ('26) ; 

 Verneuilina d'Orb. ; Cuneolina d'Orb. ('39) ; Pavonina d'Orb. ('26) ; Valvulina 

 d'Orb. ('26) ; Chrysalidina d'Orb. ('46) ; Tritaxia Reuss ; Clavulina d'Orb. 



Subfamily 2. Buliminince. The shells are typically spiral, the weaker forms are 

 more or less bi-serial. The main aperture is not round, but elliptical, comma- 

 shaped, etc. Genera : Virgulina d'Orb. ('26) ; Bulimina d'Orb. ('26) ; Bolivina 

 d'Orb. ; Bifarinia Parker and Jones. 



Subfamily 3. Cassidulineoe. The shell consists of a series of alternating segments 

 more or less coiled. Genera : Cassidulina d'Orb. ('26) ; Elirenbergina Reuss. 



Family 6. Chilostomellidae. The shell is calcareous, finely perforate, and polythala- 

 mous. The segments follow each other from the same end of the long axis, or 

 alternately from the two ends, or in cycles of three, which are more or less em- 

 bracing. The aperture is a curved slit at the extremity of the final segment. 

 Genera : Ellipsoidina Seguenza ; Chilostomella Reuss ; Allomorphina Reuss. 



Family 7. Lagenidae. The shell is calcareous and very finely perforated; it is 

 monothalamous or polythalamous. In the latter the chambers may be joined 

 together in a straight, curved, spiral, or branching series. The aperture is ter- 

 minal, and may be simple or radiate. The shell is not complicated by inter- 

 septal skeletons or by canal systems. 



Subfamily 1. Lagenina. Shell monothalamous. Genera: Lagena Walker and' 

 Boys (1784); Nodosaria Lamarck ('16); Lingulina d'Orb. ('26); Vaginuliiia 

 d'Orb. ('26); Rimulina d'Orb. ('26); Frondicularia Defrance ; Marginulina 

 d'Orb. ('26), etc. 



Subfamily 2. Polymorphinina. The segments composing the shell are arranged 

 spirally or irregularly around the long axis ; they are rarely biserial and alter- 

 nate. Genera : Polymorphina d'Orb. ('26) ; Uvigerina d'Orb. ('26) ; Sagrina 

 Parker and Jones. 



Subfamily 3. Ramulinina. The branching shell is composed of long tubulariform 

 tubes. Genera : Ramulina Rupert Jones. 



Family 8. Globigerinidas. The shell is free, calcareous, and perforated. The con- 

 spicuous shell-aperture may be single or multiple. There is no supplementary 

 skeleton or canal system. The animals are normally pelagic in habit. Genera: 

 Globigerina d'Orb. ('26) ; Orbiculina Lam. ; Hastigerina Thompson ('76) ; Can- 

 deina d'Orb. ('26); Pullenia Park. & Jones ('62); Sphtzroidina d'Orb. ('26). 



Family 9. Rotalidas. The shell is calcareous, perforated, free, or adherent ; it is 

 typically spiral in form, but irregular forms may be outspread or flaring, acervu- 



