FORAMINIFERA OF IHE ATLANTIC OCEAN, 53 



CJenus PELOSINA H. B. Brady, 187<). 



Pelosina II. B. Brady (type, P. variabilis H. li. Brady), Quart. Journ. Micr. 

 Sci., vol. 19, 1879, p. 30. — Butschtj, in Bronn, KlaBsen und Ordnungen 

 Thicrreichs, vol. 1, 1880, p. 194. — H. B. Brady, Rep. Voy. ChulUmjer, Zoology, 

 vol. 9, 1884, p. 235. -Rhumbler, Arch. Prot., vol. 3, 1903, p. 238.— Cushman, 

 Bull. 71, U. S. Nat. Mu8.. pt. 1, 1910, p. 4r).— Rhumblkr, Plankton-Exped., 

 Forarainiferen, pt. 2, 1913, p. 374. 



Description. —Test free, variously formed, rounded, cylindrical or 

 irregularly elongate; wall usually thick, composed of mud with 

 various foreign bodies included in the outer portions; interior with 

 a thin, membranaceous, chitinous layer often extendmg out and 

 forming the whole wall at the apertural end of some species; aperture 

 typically single and terminal, occasionally multiple in P. variabilis. 



Several species occur in the Atlantic, but only two, P. variabilis 

 and P. cylindnca, are known from many stations. 



PELOSINA VARIABILIS H. B. Brady. 



Plate 22, figs. 1-4. 



Pelosina ruriubilis H. B. Brady, Quart. Jouru. Micr. Sci., vol. 19, 1879, p. 30, 

 pi. 3. figs. 1-3; Rep. Voy. Challenrfer, Zoology, vol. 9, 1884, p. 235, pi. 26, 

 figs. 7-9.— Fmnt. Rep. U. S. Nat. IMus., 1897 (1899), p. 260, pi. 4, fig. 1.— 

 Rhu.mbler, Arch. Prot., vol. 3, 1903, p. 239, fig. 74 (in text). — Chapman, 

 Trans. New Zealand Inst., vol. 38, 1905. p. 83.— Cushman, Bull. 71. U. S. 

 Nat. Mus., pt. 1, 1910. p. 47, fig. 52 (in text). — Heron-Allen and Earland, 

 Trans. Linn. Soc. London, vol. 11, pt. 13, 191fi. p. 218. 



Descriptioit. -Test irregular, consisting of a single fusiform chamber 

 or of two or three independent chambers, irregularly associated, 

 but usually attached near the apertural end of the main chamber; 

 wall thick, irregular but usually fairly smooth composed of fine mud 

 with more or less irregularly placed foreign bodies at the surface; 

 basal layer thin and membranaceous, chitinous, sometimes extended 

 into a tubidar neck at the apertural end; chamber in general con- 

 forming to the shape of the whole test; aperture terminal, circular; 

 in some cases multiple and irregularly placed; color of test grayish. 



Length, up to 20 mm.; diameter, usually not exceeding 2 mm. 



JJistribution.^This is by far the most common species of the genus 

 in the Atlantic. In the Challenger Report Brady gives the following 

 North Pacific records: Off Curabrae, 50-60 fathoms (Robertson); 

 west coast of Scotland and coast of Norway (Norman); off Franz 

 Josef Land, 125 fathoms (Austro-Hungarian North Polar Expedi- 

 tion). It is also recorded from the Bay of Biscay (Rluimbler), 

 off the west of Scotland (Heron-Allen and lO.-uhuKi i, and fiDm tlu; 

 GuK of Mexico (Flint). 



From the Albatross materud 1 have had specimens Iroiu more 

 than 20 stations ranging from Nova Scotia soutJiward to the coast 

 of South Carolina and 2 stations in the Gulf of Mexico eastward 

 from the mouth of the Mississippi. Tliese range in depth from 82 



