62 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



aperture not apparent, the pseudopodia being thrust out at the basal 

 portion of the test near the surface of attachment. 



As now used this genus includes only the following species. In the 

 genus Ammolagena is placed A. clavata, which seems to have prac- 

 tically no characters in common with W. hemisphaerica. Ammo- 

 lagena has a definite second tubular chamber and a definite aperture. 



WEBBINELLA HEMISPHAERICA (Jones, Parker, and H. B. Brady). 



Plate 25, figs. 1-3. 



Webbina hemisphaerica Jones, Parker, and H. B. Brady, Pal. Soc. Mon., 1865, 

 p. 27, pi. 4, fig. 5. — Robertson, Rep. Brit. Ass., 1875, p. 189. — H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 350, pi. 41, fig. 11. — Egger, 

 Abh. bay. Akad. Wiss. Munchen, vol. 18, 1893, p. 266, pi. 14, figs. 1-3.— 

 CusHMAN, Proc. Boston Soc. Nat. Hist., vol. 34, 1908, p. 24. — Heron-Allen 

 and Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 53. 



Placopsilina bulla Goes (part), Kougl. Svensk. Vet. Akad. Handl., vol. 25, No. 9, 

 1894, p. 28, pi. 6, figs. 211, 212 (not figs. 213-215). 



Psammosphaera hemisphaerica Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 

 1899, p. 671. 



Webbinella hemisphaerica Rhumbler, Arch. Prot., vol. 3, 1903, p. 228, fig. 54 (in 

 text).— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 51, figs. 56o, b 

 (in text).— Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 1914, p. 1003. 



Description. — Test fixed, circular in outline when viewed from 

 above, central portion convex, surrounded by a flattened flangelike 

 border of varying width but sometimes entirely absent, chamber 

 single, undivided, wall composed of fine sand grains with a very 

 large proportion of cement, nearly smooth outside, smoothly finished 

 within or occasionally roughened if there is an excess of sand ; aper- 

 ture indefinite, the pseudopodia being thrust through near the base 

 just above the attachment; color usually grayish white, sometimes 

 light brown. 



Diameter, 0.5-1.5 mm. 



Distribution. — Heron-AUcn and Earland suggest that the apparent 

 rarity of this species is due to the fact that it usually occurs in coarse 

 shell sand or gravel containing few other Foraminifera. On the 

 western side of the Atlantic such bottom conditions obtain where 

 the species occurs. It has been noted from eight Albatross stations 

 ranging in depth from 159 to 2,620 fathoms, with the average about 

 1,000 fathoms, bottom temperatures ranging from 36.4° at the 

 deepest station to 47.4°F. at the shallowest. These Albatross stations 

 are aU south of Cape Cod, three southeast of Cape Cod, one off New 

 Jersey, three off South Carolina, and the other in the Caribbean Sea 

 north of Panama. I have recorded it from shallow water in the 

 Woods Hole region. On the other side of the Atlantic it is Imown 

 from the Faroe Channel, from the North Sea coast of England off 

 Durham, from the Clare Island region, west of Ireland, and from off 

 the Cape Verde Islands. Pearcey records it from the Antarctic in 



