76 BULLETIISr 10 4, UNITED STATES NATION" AL MUSEUM 



This species is well developed in fairly deep water in the Atlantic 

 north of the Antilles but is recorded elsewhere in deep water. Its 

 development is from a biloculine young and its resemblance to Spiro- 

 loculina only a case of parallelism. 



Genus NEVILLINA Sidebottom, 1905 



Nevillina Sidebottom, (Genoholoty pe, NevilUna coronata Sidebottom), Mem. 

 Proc. Manchester Lit. and Pliilos. Soc, vol. 49, pt. 2, No. 11, 1905, p. 

 . 1. — CusHMAN, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, 

 p. 156. 



Test similar to Pyrgo in the young, but in the adult the last- 

 formed chamber almost completely embracing the earlier ones; 

 aperture circular, complex, formed by numerous incurved lamellae 

 meeting centrally; chambers not labyrinthic. 



Recent. 



This genus is very restricted in its distribution, being found in the 

 Sulu Sea in a few fathoms. 



Genus IDALINA Schlumberger and Munler-Chalmas, 1884. 



Idalina Schltjmberger and Munier-Chalmas, (Genoholotype, Biloculina 

 anliqua d'Orbigny), Bull. Soc. Geol. France, ser. 3, vol. 12, 1884, p. 

 629. — Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, 

 p. 158. 



Biloculina (part) d'Orbigny, Prod. Pal., vol. 2, 1850, p. 210. 



Test in the microspheric form quinqueloculine, followed by a 

 triloculine, then biloculine series and in the adult with the penulti- 

 mate chamber showing as a narrow strip at one side near the base 

 and the final chamber making up the remainder of the surface of 

 the test; aperture cribrate but the chambers not labyrinthic. 



Upper Cretaceous. 



Genus PERILOCULINA Munier-Chalmas and Schlumberger, 1885 



Periloculina Munier-Chalmas and Schlumberger (Genoholotype, Perilo- 

 culina zitteli Munier-Chalmas and Schlumberger), Bull. Soc. Geol. France, 

 ser. 3, vol. 13, 1885, p. 308. — Cushman, Special Publ. No. 1, Cushman 

 Lab. Foram. Res., 1928, p. 158. 



Test similar to Idalina, but the last-formed chamber completely 

 involute, the chambers labyrinthic; aperture complex, cribrate. 

 Upper Cretaceous. 



Genus LACAZINA Munier-Chalmas, 1882 



Lacazina Munier-Chalmas (Genoholotype, Alveolina compressa d'Orbigny), 

 Bull. Soc. G6ol. France, ser. 3, vol. 10, 1882, p. 472. — Cushman, Special 

 Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 158. 



Test in the young similar to Periloculina , hut in the adult compressed 

 into a flattened spheroid, the apertures appearing as a ring of pores 

 near the periphery on the dorsal side. 



Upper Cretaceous. 



