FORAMTNIFERA OF THE ATIANTIC OCEAN. 



63 



2,621 fathoms, Heron- Allen from the Hauraki Gulf in New Zealand, 

 and I have recorded it from the northwest Pacific. 



It seems, therefore, to be a widely distributed species and probably 

 overlooked, as Heron-Allen and Earland suggest. 



Webbinella hemisphaerica — material examined. 



Genus THOLOSINA Rhumblcr, 1895. 



Placopsilina H. B. Brady (type Placopsilina bulla (H. B. Brady)) (part), Quart. 

 Journ. Micr. Soc, vol. 19, 1879, p. 51; vol. 21, 1881, p. 51; Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 314. 



Tholosina Rhumbler, Nachr. Kongl. Ges. Wies. Gottingen, 1895, p. 82; Arch. 

 Prot., vol. 3, 1903, p. 226.— Cushman, Bull. 71, U. S. Nat. Mue., pt. 1, 1910, 

 p. 49. — AwERiNZEW, Mem. Acad. Imp. Sci. St. Petersburg, ser. 8, vol. 29, 

 No. 3, 1911, p. 8.— Pearcey, Trans. Roy. Soc. Edinbui-gh, vol. 49, 1914, 

 p. 1002. 



Pseudoplacopsilina Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, 

 p. 672. 



Description. — Test attached, hemispherical, flattened on the side 

 by which it is attached, chamber single, undivided; with pseudopodial 

 extensions of the test along the surface of the attached surface or 

 with the sides clear cut; wall of fine sand grauis with a large proportion 

 of calcareous cement; pseudopodial openings at base along attachment 

 or at the end of irregular tubes running out from the base along the 

 surface of attachment. 



Of the two species T. bulla is usually attached to other arenaceous 

 foraminifera in fairly deep water, while T. vesicularls is more often 

 attached to pebbles or rocks in much shallower water. 



THOLOSINA BULLA (H. B. Brady). 



Plate 25, fig. 6. 



Placopsilina bulla 11. B. Brady, Quart. Journ. Micr. Soc, vol. 21, 1881, p. 51; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 315, pi. 35, figs, 16, 17.— Goes, 

 Kougl. Svensk. Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 28, pi. 6, figs. 

 213-215 (not figs. 211, 212= Ammolagcjia); Bull. Mus. Comp. Zool., vol. 29, 

 1896, p. 25.— MiLLETi', Journ. Roy. Micr. Soc, 1899, p. 361, pi. 5, fig. 11. 



