FOBAMINIFERA OF THE ATLANTIC OCEAN. 27 



MARSIPELLA ECHINATA (de Folin). 



BathysipJwn echinatus de Folin. Act. Soc. Linn. Bordoaux. vol. 40 (ser. 4, vol. 



10), 1886, p. 278. pi. 6, fig. 3. 

 Marsipella echinata Rhumbler, Arch. Prol.. vol. 3, 1903, p. 266, lig. Ill (in text). 



Descri'ption. — Test free, irregularly cylindrical, open at one end ; 

 wall composed largely of elongate s])onge spicules on the exterior, 

 sand grains beneath, spicules placed crosswise and outer surface 

 rough bristly, the spicules pointing at an acute angle backward, 

 aperture formed by the open end of the tube. 



Length, 9-10 mm.; breadth, 0.5-0.6 mm. 



Distribution. — Described by de Folin from the Gulf of Gascony. 



This seems to be a Marsipella rather than Bathysiplion if the spicu- 

 lar condition of the exterior is taken into consideration. It might 

 have been also a very spiculiferous form of Saccorhiza. Nothing is 

 known of it except de Fohn's description and figure. 



Genus BATHYSIPHON G. O. Sars, 1871. 



BathysipJwn (M. Sars in MS.) (type, B. filiformis G. O. Sars) G. O. Saks, Forh. 

 Vid. Selsk. Christiania. 1871 (1872). p. 251.— Norman, Rep. Brit. Ass. 

 (Swansea), 1880, pp. 389-390.— H. B. Brady. Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 248.— DE Folin, Act. Soc. Linn, Bordeaux, vol. 40, 1886. 

 p. 273.— Rhumbler, Arch. Prot., vol. 3. 1903. p. 269.— Cushman. Bull. 71, 

 U. S. Nat. Mas., pt. 1, 1910, p. 30. 



Description. — Test free, cylindrical, often tapering slightly, straight 

 or more often somewhat curved, in some species externally con- 

 stricted but not correspondingly constricted internally; wall com- 

 posed ol a base of broken sponge spicules cemented and overlaid witli 

 a fine grained apparently siliceous cement, aperture at the ends of the 

 tube. 



Tliere are several species of this genus known from the Atlantic, 

 mostly from the cooler waters. 



BATHYSIPHON FILIFOP.MIS G. O. Sars. 



Plate 11, figs. 4, 5. 



Bathysiphon fiUfonnis (M. Sars MS.) G. O. Sars, Forh. Vid. Selsk. ("hristiania. 

 1871 (1872), p. 251.— XoRMAN, Rep. Brit. Ass. (Swansea), 1880, p. 389.- 

 H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 248. pi. 26. 

 figs. 15-20.— Goes, Kongl. Sveusk. Vet. Akad. HaudL, vol. 25, No. 9, 1894, 

 p. 16, pi. 3, figs. 39-41.— DE Folin, Act. Soc. Linn. Bordeaux, vol. 40, 

 1880, p. 279, pi. 0, figs. 4o-c.— Chapman, Proc. Zool. Soc. London, 1895, 

 p. 12.— Goes, Bull. Mus. Comp. Zool., vol. 29, 189G, p. 23, pi. 1, figs. 11, 12.— 

 Rhumbler, Arch. Prot., vol. 3, 1903, p. 270, fig. 116 (in text).— Schubert. 

 Jahrb. geol. Reichsanst, vol. 53, 1904. p. 412, pi. 19, fig. 13.— Cushman, 

 Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 31, figs. 17-21 (in text).— Pearcey, 

 Trans. Roy. Soc. Edinburgh, vol. 49, 1914, p. 999. 



Desenption. — Test free, cylindrical, of nearly uniform diameter 

 tlu'oughout, slightly curved, chamber tubular, of uniform diameter, 



