4 BULLETIiSr 104, UNITED STATES NATIONAL MUSEUM, 



Description. — Test made up of a few ovate chambers in a coil, 

 each chamber making up 120'^ of the volution so that but three 

 chambers are visible from the exterior; wall thin, translucent, 

 finely punctate; aperture a narrow slit at the base of the chamber. 



The genus is closely related to Chilostomella and bears somewhat 

 the same relation to it that Triloculina does to Bilocvlina. 



The geological range of the genus is apparently somewhat greater 

 than that of Chilostomella, going back to the Upper Cretaceous. 



ALLOMORPHINA TRIGONA Reuss. 



Plate 1, figs. 11-13. 



Allomorphina trigona Reuss, Denkschr. Akad. Wiss. Wien, vol. 1, 1850, p 

 380, pi. 48, figs. 14 a-e. — Schwager, Boll. Com. Geol. Italia, vol. 8 

 1877, p. 26, pi. 71. — H. B. Brady, Quart. Journ. Micr. Sci., vol. 19 

 1879, p. 67, pi. 8, figs. 13, 14; Rep. Voy. Challenger, Zoology, vol. 9 

 1884, p. 438, pi. 55, figs. 24-26.— Egger, Abh. kon. bay. Akad. Wiss 

 Munchen, CI. II, vol. 18, 1893, p. 305, pi. 9, figs. 3, 4.— Goes, Kongl 

 Svensk. Vet. Akad. Handl., vol. 25, 1894, p. 53, pi. 9, figs. 517-519.— 

 GoDDARD, Rec. Austr. Mus., vol. 6, 1905-7, p. 307. — Cushman, Bull. 71 

 U. S. Nat. Mus., pt. 4, 1914, p. 3, pi. 1, figs. 6-8; Bull. 100, U. S 

 Nat. Mus., vol. 4, 1921, p. 284. 



Description. — Test composed of several ovate chambers, coiled, 

 each chamber making 120° of the volution and embracing so that 

 but three chambers are visible from the exterior; chambers longer 

 than wide, inflated; sutures somewhat depressed; wall smooth, con- 

 spicuously punctate, usually thin and translucent; aperture a narrow 

 curved opening at the base of the ventral margin of the chamber 

 between it and the previously formed adjacent chamber. 



Length about 0.40-0.60 mm. 



Distribution . — About the only Atlantic record for this species 

 seems to be that of Goes, who records it from off Spitzbergen. Other 

 records for the species as a living form are from the Indo-Pacific. 



Genus SEABROOKIA H. B. Brady, 1890. 



Seabrookia H. B. Brady (type, S. pellucida H. B. Brady), Journ. Roy. 

 Micr. Soc, 1890, p. 570.— Chapman, The Foraminifera, 1902, p. 182. 



Description, — Test composed of a series of chambers, each par- 

 tially or entirely inclosing the preceding one; wall thin, hyaline, 

 perforate; aperture terminal, rounded, with a slightly thickened lip. 



The records for this genus are all from recent seas, but are widely 

 scattered in the various oceans. 



