18 SHALLOW-WATER FORAMINIFEUA OF TORTUGAS REGION. 



Family ASTRORHIZID^E. 



Genus IRIDIA Heron-Allen and Earland, 1914. 



Iridia diaphana Heron-Allen and Earland. 



Iridia diaphana Heron-AIlcn and Earland, Trans, Zool. Soc. London, vol. 20, 1914, p. 371, pi. 

 30; 1915, p. 607.— Cushman, Proc. U. S. Nat. Mu3., vol. 57, 1920, pp. 153-158, pl8. 19 to 21. 



Test attached, composed of an upper convex surface of agglutinated sand- 

 grains and a ventral thin, transparent, chitinous layer; periphery of test 

 flattened, containing numerous radial canals from central cavity to exterior. 



Diameter of the Tortugas specimens up to 5 mm. 



Attached to various objects there are specimens which are referred 

 to this species, described by Heron-Allen and Earland from the 

 Kerimba Archipelago, off the eastern coast of Africa. These are 

 most usually found attached to the broad leaves of Posidonia, 

 which covers the bottom in shallow water in various places. 



Numerous observations on the living animal were recorded from 

 the Tortugas in the paper above referred to (Cushman, 1920). The 

 association of unicellular algae with this species has been noted in 

 the introduction of this paper. 



Genus HALIPHYSEMA Bowerbank, 1862. 



Haliphysema advena, new species. 



Haliphysema tumanowiczii Moebius (not Bowerbank), Meeresfauna Insel Mauritius, 1880, 

 p. 72, pi. 1; pi. 2, fig. 1. — Heron-Allen and Earland. Trans. Zool. Soc. London, vol. 20, 

 1915, p. 611.— Cushman (in part), Bull. 104, U. S. Nat. Mus., pt. 1, 1918, p. 87. 



Test attached by a spreading base, main body cylindrical, the distal end 

 capitular, subspherical, with a radiating mass of acerose sponge-spicules from 

 a base of amorphous fine material; wall of cyhndrical portion of broken 

 sponge-spicules arranged generally lengthwise of the column, those of the base 

 irregular with numerous sand-grains, tubular body about 10 times as long as 

 diameter, the enlarged distal end about twice the diameter of tubular body. 



Length of whole test, exclusive of the spicules of the crown, about 6 mm. ; 

 diameter of cylindrical body 0.4 mm. 



Specimens including the one here figured were found on the under- 

 side, or in cavities, of worn coral masses on the banks near Long Key. 



This species is interesting in its relations to other already 

 described species of 2 genera. From its enlarged base and expanded 

 top it is evidently a species of Haliphysema, differing specifically 

 from either H. tumanowiczii Bowerbank or H. ramulosum Bowerbank. 

 It is evidently, from a comparison of the figures, close to or identical 

 with the species figured by Moebius from Mauritius. Heron-Allen 

 and Earland, at a nearby locality, the Kerimba Archipelago, off the 

 eastern coast of Africa, record the species, noting the resemblance 

 of their specimens to the figures of Moebius. The specimen I have 

 noted from the Caribbean is probably the same. The specimen 

 here figured from the Tortugas, in shallow water, is very evidently 

 close to the specimens of Moebius. These are different from the 

 typical clavate form of H. tumanowiczii Bowerbank from the British 



