GASTEROPODA. 39 
CERITELLA MITRALIS. Plate V, fig. 15. 
C. Testa conicd, apice acuminatd, anfractibus (7) angustatis, planis, marginibus sub- 
tumescentibus ; apertura parvd,obliqud ; canal brevi. 
Shell conical, apex acute, whorls (7) narrow, flattened, ther upper margins slightly 
turned ; aperture small, oblique; canal short. 
This species is unusually short and conical. Axis 5 lines, transverse diameter 3 lines. 
Locality. The planking of Minchinhampton Common, where it is rare. 
CrRITELLA contca. Plate V, figs. 10, 10a, 104, 10c. 
C. Testé turritd, acutd ; anfractibus angustatis planis (8) ; costis longitudinalibus, a 
dextro ad sinistram obliquis ; aperturd angustatd, canali obliquo. 
‘Shell turreted, acute; whorls narrow, flattened (8), with longitudinal oblique ribs, 
passing obliquely from right to left ; aperture narrow, canal oblique. 
The upper margin of each whorl has a slight encircling rib, which is united to the 
oblique costa. The character of the markings in this species resembles C. gidéosa ; but in 
that species, although the whorls are equally numerous, the spire is very small, and the 
canal is almost obsolete. The length of the last whorl is two fifths of the entire shell. 
Axis 63 lines, transverse diameter 3 lines. 
Locality. The planking of Minchinhampton Common and white stone of Bussage 
have furnished it but rarely. 
CERITELLA GiBBosA. Plate IX, fig. 17. 
C. Testa parva turritd, spird mediocriter elatd, apice acuto, anfractibus planatis, angus- 
tatis et angulatis, longitudinaliter costatis ; costis numerosis, a dextro ad sinistram obliquis ; 
anfractu ultimo, magno ; aperturd obliqud, angustatd et elongata. 
Shell small, turreted; spire moderately elevated ; apex acute; whorls flattened at the 
sides, narrow, and angulated at their upper portions; longitudinally costated; costae 
numerous, directed obliquely from right to left; the last whorl large; aperture oblique, 
narrow, and elongated. 
The angle of the whorls is slightly thickened and prominent; the costa are distinct 
immediately beneath it, but are not discernible upon the lower portion of the whorls. The 
length of the aperture is equal to the remaining portion of the shell. The specimen figured 
is rather more gibbose than usually obtains, for the proportions vary, but in point of size 
there is no considerable difference. It is somewhat rare, and occurs in the soft shelly 
Oolite which underlies the planking. Axis 3 nes. 
Locality. Minchinhampton Common. 
