FORAMINIFERA 59 





Diaphorodon, Archer ; Allogromia, Rhumbl. ( = Gromia, auctt. 1 nee Duj. 

 (Fig. 14, 1) ; Lieberkiihnia, CI. and Lachm. (Fig. 12) ; Microgromia, R. Hertw. 

 (Fig. 11) ; Pamphagus, Bailey. 



2. Astrorhizidaceae : test arenaceous, often large, never truly chambered, 

 or if so, asymmetrical. Astrorhiza, Sandahl ; Haliphysema, Bowerb. ; Sac- 

 cammina, M. Sars (Fig. 1 3, 1) ; Loftusia, Brady. 



3. Lituolidaceae : test arenaceous, often symmetrical or regularly spiral, 

 isomorphous with calcareous forms : the chambers when old often " labyrin- 

 thine" by the ingrowth of wall-material. Lituola, Lam. ; Reophax, Montf. ; 

 Ammodiscus, Reuss ; Trochammina, Parker and Jeffreys. 



4. Miliolidaceae : test porcellanous, imperforate, spirally coiled or cyclic, 

 often chambered except in Comuspira : simple in Squamulina. Comuspira, 

 Max Sch. ; Peneroplis, Montf.; Miliolina, Lam. (inch Biloculina (Fig. 15), 

 Triloculina, Quinqueloculina (Figs. 14,4; 15, B), Spiroloculina (Fig. 13,5) 

 of d'Orb.); Alveolina, d'Orb.; Hauerina, d'Orb. ; Calcituba, Roboz; Orbitolites, 

 Lam. ; Orbiculina, Lam. ; Alveolina, Park, and Jeffr. ; Nubecularia, Def. ; 

 Squamulina, Max Sch. (Fig. 14, 3). 



5. Textulariaceae : test calcareous, hyaline, perforated ; chambers increasing 

 in size in two alternating rows, or three, or passing into a spiral. Textularia, 

 Def. ; Bulimina, d'Orb. ; Cassidulina, d'Orb. 



6. Cheilostomellaceae : test vitreous, delicate, finely perforated, chambered, 

 isomorphic with the spiral forms of the Miliolidaceae. Cheilostomella, Reuss. 



7. Lagenaceae : Test vitreous, very finely perforate, chambers with a 

 distinct pylome projecting (ectoselonial), or turned in (entosolenial), often 

 succeeding to form a necklace-like shell. Lagena, Walker and Boys (Fig. 1 3, 2) ; 

 Nodosaria, Lam. (Fig. 13, 3); Cristellaria, Lam.; Frondicularia, Def. (Fig. 

 13, 4) ; Polymorphina, Lam. ; Eamulina, Wright. 



8. Globigerinidae : test vitreous, perforate ; chambers few, dilated, and 

 arranged in a flat or conical spiral, usually with a crescentic pylome to 

 the last. Globigerina d'Orb (Figs. 13, 6 ; 16, 2) ; Hastigerina, Wyv. Thorns. ; 

 Orbulina, d'Orb (Fig. 16, 1). 



9. Rotaliaceae ; test vitreous, perforate, usually a conical spiral (like a 

 snail), chambers often subdivided into chamberlets, and with a proper wall, 

 and intermediate skeleton traversed by canals. Rotalia, Lam. (Fig. 14, 2) ; 

 Planorbulina, d'Orb. (Fig. 13, 9); Pohjtrema, Risso ; Spirillina, Ehr. (non- 

 septate) ; Patellina, Will. ; Discorbina, P. and J. (Fig. 13, 7). 



10. Nummulitaceae : test usually a complex spiral, the turns completely 

 investing their predecessors : wall finely tubular, often with a proper wall 

 and intermediate skeleton. Fusulina, Fisch. ; Polystomella, Lam. ; Nummulites> 

 d'Orb. (Fig. 13, 11); Orbitoides, d'Orb. 



The Allogromidiaceae are a well-marked and distinct order, on 

 the whole resembling the Ehizopoda Filosa, and are often found 

 with them in fresh water, while all other Foraminifera are marine. 

 The type genus, Allogromia (Fig. 14, 1), has an oval chitinous 

 shell. Microgromia socialis (Fig. 11) is often found in aggregates, 

 the pseudopodia of neighbours fusing where they meet into a 



1 The type of Dujardin's genus Gromia is G. oviformis = Hyalopus dujardinil. 

 M. Sch., which is one of the Filosa. 



