38 MOLLUSCA FROM THE GREAT OOLITE. 
CERITELLA UNILINEATA, Sow., sp. Plate V, fig. 13. 
BuccrinUM UNILINEATUM, Sow. 1825. Min. Con., t. 486, figs. 5, 6. 
— — Morris. 1843. Cat. Brit. Foss., p. 139. 
PURPURINA UNILINEATA, D’Orb. 1850. Prod. Paléont., p. 302. 
C. Testé parva, ovato-elongatd, gibbosd ; spird acutd ; anfractibus (i—8) angustatis, 
superne planis et subangulatis. 
Shell small, ovately elongated, gibbose,; spire acute; whorls (7—8) narrow, flattened 
in their upper portions or subangulated. 
This little gibbose shell has a spire about equal in length to the last whorl; the whorls 
are bevilled near to their upper junctions, or slightly depressed, which gives the appearance 
of a line or furrow encircling them. Axis 44 lines, transverse diameter 2 lines; but the 
Ancliff specimens are usually smaller. 
Locality. The white stone of Bussage has furnished only one specimen near Minchin- 
hampton ; but it is much more abundant at Ancliff. 
CeRITELLA PLANATA. Plate V, figs. 14, 14a. 
C. Testa turritad, acutd ; anfractibus angustatis, numerosis, planis ad basim unilineatis , 
apertura et caudd ut in C. acuta. . 
Shell turreted, acute; whorls narrow, numerous, flattened; a single encircling line is 
placed at the lower part of each whorl, a little above the suture; aperture and canal as in 
C. acuta. Axis 44 lines, transverse diameter 24 lines. 
Locality. Rare: the specimen figured is from the white stone of Eastcombs, in the 
parish of Bisley. 
CrRITELLA Sowersil. Plate V, fig. 16. 
C. Testa turritd, subfusiformi, acutd ; anfractibus (I—8) conveaiusculis, infra suturam 
unilineatis ; aperturd obliqua, elongata ; caudd brevi. 
Shell turreted, subfusiform, acute; whorls (7—8) slightly convex, with a transverse 
line beneath the suture ; aperture oblique, lengthened ; canal short. 
This species varies considerably in the elevation of the spire. Axis 8 lines, transverse 
diameter 3 lines. 
Locality. Vt occurs in the upper portion of the shelly beds, both north and south of 
the vale of Brimscomb. It is rare. 
