MONOGRAPH 
OF THE 
FORAMINIFERA OF THE CRAG. 
Class—RHIZOPODA. 
Order—RETICULARIA (FORAMINIFERA). 
Sus-orpDER—/MPEHRFORATA. 
Famity—MILIOLIDA, Carpenter. 
Genus—CornuspPIra, Schultze. 
OrBis, Philippi (in part). 
Cornuspira, Schultze (in part). 
SprriLuina, Williamson (in part). 
Sonpania, D’ Orbigny (in part). 
OrERcuULINA, Czjzek and Reuss (in part). 
Cornusprra, Parker and Jones, Carpenter, Reuss, Brady. 
General characters.—Shell, a flat spire, formed of a simple, non-segmented, and 
usually unconstricted tube, coiled on itself in a horizontal plane, usually cylindrical in 
the earlier portions of its growth, but becoming wider and flatter as it approaches 
maturity: white, opake, smooth, and free from ornamentation or surface-markings, 
except slight transverse ridges, apparently indicating its successive additions during growth. 
Aperture, terminal; oval or slit-like in shape, according to the extent of flattening which 
has taken place in the tube. 
D’Orbigny, in the ‘ Annales des Sciences Naturelles,’ vol. vii, p. 281, grouped a number 
of complanate Foraminifera under the generic name Soldania. The figures in Soldani’s 
1 Operculina eretacea, Reuss, Verst. bohm. Kreid., p. 35, pl. 13, figs. 64 and 65 (Cornuspira 
eretacea, Reuss, Sitzungsb. K. Ak. Wien., vol. xl, p. 177, pl. 1, fig. 1), seems to be the same as D’Orbigny’s 
Operculina incerta, Foram. Cuba, p. 49, pl. 6, figs. 16, 17; and this is a Trochammina. 
1 
