TORAMINIFERA OF NORTH PACIFIC OCEAN. 119 



PLACOPSILINA CENOMANA d Orbigny. 



Placopsilina cenomana d'Orbigny, Prodr. Pal., vol. 2, 1850, p. 1C5, no. 758. — 

 Reuss, Denkschr. kais. Akad. \Yiss. Wien, vol. 7, 1854, p. 71, pi. 28, figs. 4, 

 5. — Butschli, in Bronns Klassen und Ordnungen des Thierreichs, vol. 1, 1880, 

 p. 191, pi. 5, fig. 19.— Haeusler, Quart. Journ. Geol. Soc, vol. 39, 1883, 

 p. 27, pi. 3, fig. 1; Neues Jahrb., vol. 1, 1883, p. 59, pi. 3, figs. 12-14.— H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 315, pi. 36, figs. 1-3. — 

 Wright, Proc. Belfast Nat. Field Club., 1884-85, App. 9, 1886, p. 320, pL 

 26, figs. 3a, b. — Haeusler, Neues Jahrb., Beil., vol. 4, 1885, p. .8, pi. 1, 

 figs. 24, 25.— Howchin, Journ. Roy. Micr. Soc, 1888, p. 536, pi. 8, fig. 4.— 

 H. B. Brady, Parker, and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 218, 

 pi. 42, fig. 13.— J. Wright, Proc Roy. Irish Acad., vol. 1, 1891, p. 468.— 

 Chapman, Proc. Zool. Soc. London, 1895, p. 17. — Sidebottom, Mem. and 

 Proc. Manchester Lit. and Philos. Soc, vol. 49, no. 5, 1905, p. 4, pi. 1, fig. 7. 



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

 p. 302. — H. B. Brady, Proc. Somerset Arch, and Nat. Hist. Soc, vol. 13, 

 1867, p. 105, pi. 1, fig. 1. 



Lituola (Placopsilina) cenomana W. B. Carpenter, Parker, and Jones, Intr. 

 Study .Foram., 1862, p. 143, pi. 11, figs. 11-14. 



Description. — Test attached, many chambered, the earlier portion 

 close coiled, more or less com- 

 pletely involute, of one or more 

 volutions, later portion uncoiled, 

 forming a linear or irregular se- 

 ries of chambers but building no 

 floor, the body to which it is at- 

 tached serving as the lower 

 wall, last formed portion in adult 

 specimens or those which are at- 

 tached to small objects rising free 

 from the attachment and making 

 an irregular cylindrical growth 

 and building a wall on all sides 

 except where it is in contact with 

 the previously formed chamber; fig. isc— placopsilina cenomana. x 10. from 

 wall arenaceous, variable in the PH0T0GRAPn - specimen attached T0 stone. 



finish of its surface, usually rough; aperture fairly large, rounded; 

 color variable, usually gray but occasionally brownish. 



Length in adults up to 5 mm., diameter 0.5-1 mm. 



Distribution. — A single specimen was found at Albatross station 

 D4900 in 139 fathoms, off Japan. 



If one looks up the various figures assigned to this species, a very 

 variable lot of things will be met with. I am not at all certain that 

 the recent material should be assigned to the cretaceous species which 

 d'Orbigny had, for even in recent material many specimens which 

 at a glance would be placed with this species are seen by close study 

 to be rugose species with smooth calcareous tests in the young and 



