GASTEROPODA. 51 
A small, slender species, with closely-arranged costa, which are rather large, but not 
much elevated; the sutures of the whorls are strongly marked ; it is rare, but has occurred 
im more than one of the shelly beds. Axis 10 lines; transverse diameter 2 lines. 
Locality. Minchinhampton Common. 
This species is named in compliment to our kind and liberal friend, N.'T. Wetherell, 
Ksq., F.G.S. 
CHEMNITZIA vaRtABILIs. Plate VIII, figs. 7, 7a, 4. 
C. Testa turritd, subulata ; anfractibus converiusculis, transversim striatis, plus minusve 
erenulatis, longitudinaliter costatis, costis curvatis circa 12 in ambitu; costis interdum inter- 
ruptis nodulosis ; apertura ellipticd obliqua ; columellé marginatd. 
Shell turreted, subulate ; whorls rather convex, transversely striated, striae more or less 
longitudinally costated, costae curved, about 12 in a volution ; ribs sometimes obsolete, and 
replaced by nodules ; aperture elliptical, oblique ; columella marginated. 
Specimens differ in the convexity of the whorls, those which are most convex have the 
ribs shortest, or reduced merely to nodules placed upon the upper border of each whorl: in 
all specimens the costa become obsolete before reaching the base of each whorl. Occa- 
sionally upon the same specimen the ribs degenerate into nodules, only the smaller whorls 
are then costated. This species was first mistaken for Melania undulata (Deslongchamps); 
but in that shell the sides of the volutions are flat, the costae are more numerous, and 
extend to the junction of the whorls, and have no curvature except in the last one; 
they are likewise less subulate than im our species. Axis 5 lines; transverse diameter 
15 lines. 
Locality. Vt is abundant in all the shelly beds of the Great Oolite, near Minchin- 
hampton. 
CHEMNITZIA PHASIANOIDES. Plate IX, fig. 5. 
C. Testa ovato-subcylindricad, spird elatd, apice obtuso ; anfractibus (5) planis, anfractu 
ultimo subcylindrico, elongato ; apertura obliqud ; labro dilatato. 
Shell ovately-subcylindrical, spire elevated, apex obtuse, whorls (5) flattened, the last 
whorl subcylindrical, elongated ; aperture oblique; outer lip dilated. 
This species has a considerable resemblance to Lulima vagans, but the spire is much 
shorter, the whorls are fewer, and the apex is more obtuse ; the aperture is rather narrow, its 
length being two fifths of the entire shell. 
Locality. The planking of Minchinhampton Common has furnished our specimens. 
