FORAMINIFERA OF THE ATLANTIC OCEAN 21 



II. Test cliainbered — Continued. 



C. Test reaching a biloculine stage. 



1. Adult biloculine. 



a. Aperture simple with a broad tooth, interior simple. 



(1). Completely involute throughout Pyrgo. 



(2). Later stages becoming evolute and spiroloculine-.Flintia. 

 h. Aperture cribrate, interior labyrinthic Fabularia. 



2. Adult exterior mostly formed by the last-formed chamber. 



a. Penultimate chamber showing as a small basal area. 



(1). Aperture of simple radiate form, chamber much elongate. 



Nevillina. 

 (2). Aperture complex, radiate in form, chamber broadly 



ovate Idalina. 



h. Penultimate chamber not visible. 



( 1 ) . Test subglobular Periloculina. 



(2). Test strongly compressed Lacazina. 



Genus AGATHAMMINA Neumayr, 1887 

 Agathamrnina Nexjmayr (Genotype by designation, Serpula pusilla Geinitz). 

 Sitz. Akad. Wiss. Wien, vol. 95, pt. 1,1887, p. 171. — Cushman, Special 

 Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 145. 

 Serpula (part) Geinitz (not Linnaeus), Verst. Deutsch. Zechst. Roth., Heft 



1, 1846, p. 6. 

 Trochammina (part) of Authors. 



Test tubular, undivided, winding about an elongate axis; wall 

 imperforate, calcareous, with arenaceous material at the surface; 

 aperture formed by the open end of the tubular chamber. 

 Carboniferous to Jurassic. 



This, as has been already noted, is the most primitive genus of the 

 Miliolidae and shows clearly the connection of the Miliolidae with 

 Glomospira of the Ammodiscidae. 



Genus QUINQUELOCULINA d'Orbigny, 1826 

 Quinqueloculina d'Orbigny (Genotype by designation, Serpula seminulum 

 Linnaeus). Ann. Sci. Nat., vol. 7, 1826, p. 301.— Cushman, Bull. 76, U. S. 

 Nat. Mus.,pt. 6, 1917, p. 42; Special Publ. No. 1, Cushman Lab. Foram. 

 Res., 1928, p. 146. 

 Serpula (part) Linnaeus, Syst. Nat., ed. 10, 1758, p. 786. 

 Adelosina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 303 (genotype, by 



designation, A. striata d'Orbigny). 

 Uniloculina d'Orbigny, Foram. Foss. Bass. Tert. Vienne, 1846, p. 261 



(genoholotype, U. indica d'Orbigny). 

 Miliolina (part) Williamson, Rec. Foram. Great Britain, 1858, p. 83 (and 

 later authors). 

 Test with the coiling in five planes, the chambers a half coil in 

 length and added successfully in planes 144° apart, five chambers 

 completing a cycle, each chamber 72° from its adjacent one, but 144° 

 from the immediately preceding one; wall imperforate, calcareous, 

 often with; arenaceous material on the exterior and in deep or brack- 

 ish water occasionally becoming siliceous; aperture usually with a 

 simple tooth. 



Carboniferous (?) to recent. 



