70 BULLKTIN 104, UNITED STATES NATIONAL MUSKUM. 



This is a largo and conspicuous species, at first sight Hke Ammo- 

 baculites but with very beautiful lab}Tinthic chambers and the aper- 

 ture so far as may bo seen in the specimens not multi])le ])ut a large 

 circular o]>ening deeply de])ressed at the sides. 



Gemre PLACOPSILINA d'Orbigny, 1850. 



fHaeopsiHna u'Ohbigny, Prodr. Pal., vol. 2, 1850, p. 96. (Type, Placopsilina 

 ce7iomana d'Orbigny). — H. B. Brady (part). Rep. Voy. Cholhnger, Zoology, 

 vol. 9, 1884, p. 315.— Chapman, The Foiaiiimfera, 1902, p. 139.— Cushman, 

 Bull. 71, U. S. Nat. Mu8., pt. 1, 1910, p. 118. 



Vcscnjttion. — Test attached, composed of numerous cliambers, the 

 early ])ortion close-coiled, la^er portions uncoiling and spreading out 

 iu an irregular but in general a linear series of chambers, building no 

 floor; last portion of the test may be entirely free, made up of an 

 irregular series of chambers; wall coarsely arenaceous, aperture 

 rounded, at the end of the last-formed chamber. 



The goiuis is characteristic of shallow waters of tropical or sub- 

 tropical regions. 



PLACOPSILINA CENOMANA d'Orbigny. 



Plate 14, fig. 5. 



Placopsilina cenomana d'ORBioNY, Prodr. Pal., vol. 2, 1850, p. 185, No. 758. — 

 Reuss, Denkschr. Akad. Wies. Wien, vol. 7, 1854, p. 71, pi. 28, figs. 4, 5.— 

 BtJTScHLi, in Bronn, Klassen imd 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, fig. 1.— Wright, 

 Proc. Belfast Nat. Field Club, 1884-85, App. 9, 1886, p. 320, pi. 26, figs. 

 3a, &.— Haeusler, Neues Jahrb., Beil., vol. 4, 1885, p.. 8, pi. 1, figs. 24-25.— 

 HowcHiN, Journ. Roy. Micr. Soc, 1S88, p. 536, pL 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., ser. 3, vol. 1, 1891, p. 468. — Chapman, 

 Journ. Roy. Micr. Soc, 1892, p. 324, pi. 6, fig. A; Proc Zool. Soc. London, 

 1895, p. 17; The Foraminifera, 1902, p. 139, pi. 7, fig. JS.— Sidebottom, 

 Mem. and Proc. Manchester Lit. and Philos. Soc, vol. 49, No. 5, 1905, p. 4, 

 pi. 1, fig. 7. — Earland, Journ. Quekett Micr. Club, ser. 2, vol. 9, 1905, p. 

 200.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 119, fig. 186.— 

 Heron-Allen and Earland, Trans. Zool. Soc London, vol. 20, 1915, p. 615. 



Lituola ceno7nana J O'K-ES 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. 

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



Descrifticn.- — ^Test attached, early portion close coiled, of one or 

 more whorls, later portion uncoiled, straight or irregular, of nearly 

 uniform diameter, chambers of about the same length; chambers 

 distinct, sutures, distinct and slightly depressed; wall coarsely 

 arenaceous; aperture simple, terminal; color gray. 



Length, up to 5 mm. 



