FORAMINIFERA OF THE ATLANTIC OCEAN 51 



AMPHISORUS HBMPRICHII Ehrenberg 



Plate 18, figures 5-7 



Amphisorus hemprichii Ehrenberg, Abhandl. k. Akad. Wiss. Berlin, 1838, 

 p. 134, pi. 3, fig. 3. 



"Orhitolites, duplex type," W. B. Carpenter, Philos. Trans., 1856, p. 120, 

 pi. 5, fig. 10; pi. 9. fig. 10. 



Orhitolites duplex W. B. Carpenter, Rep. Voy. Challenger, Zoology, pt. 21, 

 1883, p. 25, pi. 3, figs. 8-14; pi. 4, figs. 6-10; pi. 5, figs. 1-13.— H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 216, pi. 16. fig. 

 7. — W. B. Carpenter, Journ. Quekett Micr. Club, ser. 2, vol. 2, 1885, 

 p. 97, fig. 9 in text. — Woodward, The Observer, vol. 4, 1893, p. 77. — 

 Flint, Ann. Rep't U. S. Nat. Mus., 1897 (1899), p. 305, pi. 51, figs. 2, 

 3. — Chapman, Journ. Linn. Soc. London, Zool., vol. 28, 1902, p. 400 

 (list). — Sidebottom, Mem. Proc. Manchester Lit. Philos. Soc, vol. 48, No. 

 5, 1904, p. 23.— Dakin, Rep. Pearl Oyster Fish. Ceylon, 1906, p. 232.— 

 RntJMBLER, Zool. Jahrb., Abt. Syst., vol. 24, 1906, p. 53. — Sidebottom, 

 Mem. Proc. Manchester Lit. Philos. Soc, vol. 54, No. 16, 1910, p. 7. — 

 Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20, 1915, 

 p. 605.— CiTSHMAN, Bull. 71. U. S. Nat. Mus., pt. 6, 1917, p. 94, pi. 38, 

 figs. 3, 4; pi. 39, fig. 1; Publ. 213, Carnegie Instit. Washington, 1918, p. 

 290; Proc U. S. Nat. Mus., vol. 59, 1919, p. 77; Publ. 291, 1919, p. 70, 

 pi. 5, figs. 9, 10; Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 485.— Heron- 

 Allen and Earland, Bull. Soc. Sci. Hist. Nat. Corse, 1922, p. 125. — Cttsh- 

 MAN, Publ. 311, Carnegie Instit. Washington. 1922, p. 81; Publ. 342, 

 1924, p. 71. — Heron-Allen and Earland, Journ. Linn. Soc. London, 

 Zool., vol. 35, 1924, p. 610. — Cushman, Publ. 344, Carnegie Instit. Wash- 

 ington, 1926, p. 84. — Heron-Allen and Earland, Trans. Zool. Soc. 

 London, vol. 22, 1926, p. 69 (list). 



Test much compressed, circular in outline, the early chambers^^in 

 the microspheric form coiled planispirally, soon widening and becom- 

 ing annular, in the megalospheric form the annular chambers beginning 

 at once after the large rounded or oval proloculum; chambers in two 

 layers in the adult, and each divided into many chamberlets, the 

 chamberlets of each newly added series alternating with those of the 

 preceding series; wall imperforate except in the proloculum and 

 succeeding chamber which are finely porous ; apertures at the periphery 

 of the chamberlets in a double series as are the chamberlets. 



Diameter, up to 2 mm. 



The species, if those of the West Indian region and those of the 

 Indo-Pacific and Mediterranean are the same, has a wide distribu- 

 tion. In the West Indies it occurs in great numbers attached to the 

 leaves of the short eel-grass, Posidonia, which grows in great profusion 

 in shallow water. 



I have examined the types of Amphisorus Tiemprichii in the Ehren- 

 berg collection in Berlin, and it seems that Carpenter's species is a 

 synonym in which case Ehrenberg's name will take precedence. 



Specimens were found in Jamaica which had megalospheric young 

 in the outer chambers of the parent test. 



