54 



BULLETIN 104^ UNITED STATES NATIONAL MUSEUM. 



to 2,620 fathoms, the average being about 1,000 fathoms; bottom 

 temperatures range from 34.4° to 40.6° F., with one station in the 

 Gulf of Mexico in comparatively shallow water 51.6°. The average, 

 however, is about 38° F. 



Outside the Atlantic the species is recorded from the North and 

 South Pacific {Challenger, Brady) and from off New Zealand (Chap- 

 man). 



Pelosina variabilis — material examined. 



PELOSINA CYLINDRICA H. B. Brady. 



Plate 22, fig. 5. 



Pelosina cylindrica H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9. 1884, 

 p. 236, pi. 26, figs. 1-6.— Egger, Abh. bay. Akad. Wiss. Munchen, vol. 18, 

 1893, p. 2-53, pi. 4, figs. 1, 2.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 239, 

 fig. 72 (in text).— Chapman, Trans. New Zealand Inst., vol. 38, 1905, p. 83.— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 46. figs. 50, 51 (in text).— 

 Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 1914, p. 1002. 



Rhizammina indivisa Goes (part), Bull. Mus. Comp. Zool., vol. 29, 1896, p. 20. 



Description. — Test free, elongate, subcyhndrical, straight or slightly 

 curved, diameter nearly uniform, ends rounded; wall thick, composed 

 of loosely aggregated shell fragments or foraminiferal tests with a 

 base of fine mudlike material, outside irregular, rough, interior 

 smoothly finished, with a chitinous lining; color dark gray varj^ng 

 to almost white, according to the character of the wall; aperture at 

 one end, circular. 



Length, up to 15mm.; diameter, about 2mm. 



Distribution. — Most of the records for this species are from deep 

 water. The CJiallenger material except at one station was from over 

 a thousand fathoms. Two of these stations were in the Atlantic, off 



