102 MOLLUSCA FROM THE GREAT OOLITE. 
B, PyrirormMti. 
CyLinpRITES BULLATUS. Plate VIII, figs. 18, 18a, 4, c. 
2? Conus? minimus, Archiac. 1843. Mém Soc. Géol. de France, tom. v, t. 30, fig. 9. 
Acton minimus, D’Orb. 1850. Prod. Paléont., p. 299. 
ACTMONELLA MINIMA, Bronn. 1848. Index Palzont., p. 13. 
C. Testa subcylindricd, vel ovata; spird depressd, inversd; apice mammillato; anfractibus 
numerosis, marginibus rotundatis; anfractu ultimo, subconvexo, basi contracto. 
Shell subcylindrical, ovate, or bulleform; spire depressed, imversed; apex mam- 
millated ; whorls numerous, with rounded margins; the last whorl somewhat convex, with 
a contracted base. 
This form is much shorter than the last, and less flattened; the apex of the spire does 
not rise higher than the margin of the last whorl; it is mammillated, and consists of three 
minute volutions; the vertex is moderately large and crateriform. This species is very rare, 
and has only been observed in the “ planking.” 
Locality. Minchinhampton Common. Aubenton, France. 
Cytinprites pyrirormis. Plate VIII, figs. 20, 20a, 4,¢; 21. 
C. Testa cylindro-pyriformi, cavd apiciali contractd profundd, margine acuto elevato ; 
apertura ad basim vie dilatatd, plicis magnis. 
Shell cylindrical or pyriform; the apicial cavity contracted and deeply excavated, 
having an acute and somewhat elevated margin; aperture linear; the folds on the 
columella large. 
This shell is more pyriform than its congeners, the anterior extremity being short but 
attenuated, and the apicial cavity deep and contracted. ‘The cast (fig. 21) has not the 
produced acute margin to the cavity exhibited by the shell (fig. 20), the cavity consequently 
appears smaller; the apex of the spire is large but deeply situated. 
Axis 7 lines, greatest transverse diameter 43 lines, diameter of the cavity 13 lines. 
Locality. The planking of Minchinhampton Common. Casts of this shell occur higher 
in the series in shelly hard sandstone one mile east of Minchinhampton ; in both positions 
it is rare. 
Acrzontna, D’ Orbigny, 1850. 
CocuLites cyLinprorpEs, Luwid. 1760. 
Actxon, sp., Phillips. AcTmon, sp., Sow. 
Urricutus? Brown. t845. Elements of Fossil Conch. 
— Brown. 1849. Illustrations of Fossil Conch. 
