34 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Thoro sccnis to bo but a single recent species occurring in shallow 

 or medium depths, usually in tropical or subtropical waters. 



The genus seems to occur on the western side of the Atlantic, 

 only, thence across the Pacific, where in shallow waters it is often 

 very abun(hint. 



Both microspheric and megalospheric forms occur. 



HAPLOSTICHE DUBIA (d'Orbigny). 



Plate 7, figs. 2, 3. 



"Orthoceratia Zoophytica minuscula" Soluani, Testaceographica, vol. l,pt. 2, 

 1791, p. 93, pi. 98, fig. a. 



Nodnsaria dubia d'Orbigny, Ann. Sci. Nat., vol. 7, 1S2(), p. 252, No. 10. 



Lituola dubia Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., ser. 4,. 

 vol. S, 1871, p. 263, pi. 9, fig. 30. 



Lituola soldanii Jones and Parker, Quart. Journ. Geol. .Soc, vol. 16, 1860, 

 p. 307, No. 184. 



Haplostiche soldanii H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 318, pi. 32, figs. 12-18.— Egger, Abh. Bay. Akad. Wiss. Munchen, 

 vol. 18, 1893, p. 263, pi. 4, figs. 34, 35.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 277, pi. 21, fig. 3.— Chapman, The Foraminifera, 1902, p. 141, 

 pt. 7, figs. H, ?!.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 96, 

 figs. 140-141. 



Description. — Test free, elongate, subcylindrical; fusiform or 

 ovate, made up of a usually straight, linear series of short chambers, 

 labyrinthic in the interior; wall of coarse sand grains, firmly 

 cemented, forming a smooth exterior except where eroded, thick; 

 aperture in the early chambers a single opening, in adults becoming 

 cruciform, dendritic, or in some specimens several openings formed by 

 the fusing of the walls; color usually light gray. 



Length up to 7.5 mm., diameter up to 2 mm. 



Distribution. — In the Atlantic H. dubia seems to be restricted 

 to the western portion from Bermuda at the north through the West 

 Indies and Gulf of Mexico and along the coast of South America. 

 In general it is associated wdth the coral reef fauna and compara- 

 tively shallow tropical waters. Brady records it from off Bermuda, 

 in 435 fathoms (79G meters) ; off Jamaica, 50-100 fathoms (91-183 

 meters); off Culebra Island, 390 fathoms (713 meters); off South 

 America, south of Pernambuco, 350 fathoms (640 meters) ; and off 

 Rio Janeiro and from the Abrolhos Bank, off Brazil, 40-47 fathoms 

 (73-86 meters). 



Flint had it from two Albatross stations in the Gulf of Mexico, 

 D2377and D2399, in 210 and 196 fathoms (384 and 356 meters), 

 respectively. I have had it from these and two other stations in 

 the same region, as well as one station from the north coast of Cuba. 

 Material available from the general West Indian region is scanty 

 and its distribution is^ probably wide in tlie region. It is known 



