REPORT ON THE FORAMINIFERA. 
315 
and recurs at various stages of tlie Lower and Upper Cretaceous formations, but hitherto 
it does not appear to have been met with in later microzoic deposits. 
Placopsilina bulla, H. B. Brady (PL XXXV. figs. 16, 17). 
Placopsilina bulla, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 51. 
Test adherent ; consisting of a single, highly convex or approximately hemispherical 
chamber, slightly longer in one direction than the other. Aperture a simple, rounded, 
pouting orifice at each end of the test, close to the base. Cavity undivided ; walls thick, 
somewhat loosely sandy. Diameter, -gVth inch (073 mm.). 
This little organism, the simple characters of which will be readily understood by the 
figures, affects deep water, and is generally found growing adherent to the tubes of 
Rhabdammina or other arenaceous Bhizopods. The figured specimens are from the South 
Atlantic, east of Buenos Ayres, 1900 fathoms. It occurs also attached to Rhizammina, at 
Station 299, on the Pacific coast of South America, west of Valparaiso, 2160 fathoms; 
and in Dr. Carpenter’s collection there are numerous examples of the species from 
“Porcupine” Stations in the North Atlantic, notably from No. 19, west of the north of 
Ireland, 1366 fathoms. 
Placopsilina cenomana, cTOrbigny (PI. XXXVI. figs. 1-3). 
“(Eufs de Mollusques,” Cornuel, 1848, Mem. Soc. geol. France, s6r. 2, vol. iii. p. 259, pi. ii. 
fig. 36. 
Placopsilina cornueliana, d’Orbigny, 1850, Prodr. Paleont., vol. ii. p. Ill, No. 791. 
„ cenomana, Id. Ibid. p. 185, No. 758. 
„ „ Reuss, 1854, Denksckr. d. k. Akad. Wiss. Wien, vol. vii. p. 71, 
pi. xxviii. figs. 4, 5. 
Lituola cenomana, Jones and Parker, 1860, Quart. Journ. Geol. Soc., vol. xvi. p. 302, Table, 
No. 182. 
Lituola ( Placopsilina ) cenomana, Carpenter, 1862, Introd. Foram., p. 143, pi. xi. figs. 11-14. 
Placopsilina prolifer, Terquem, 1866, Foram. du Lias, 6 me Mem., p. 493, pi. xx. fig. 24. 
,, hybrida, Id. Ibid. p. 494, pi. xx. figs. 25, 26. 
Lituola cenomana, Brady, 1867, Proc. Somerset Arcb. and Nat. Hist. Soc., vol. xiii. p. 105, 
pL i. fig. 1 
Test adherent ; spiral, crosier-shaped, or linear, rarely branching ; consisting of a 
number of convex chambers closely approximated and arranged, often very irregularly, 
in single series. Aperture simple, terminal. Length, very variable ; in large specimens 
sometimes ^th inch (5 mm.) or more. 
Three species of Placopsilina are enumerated in the Prodrome de Paldontologie 
namely : — Placopsilina neocomiensis, Placopsilina cornueliana, and Placopsilina 
