486 GASTEROPODA OF THE INFERIOR OOLITE. 
442. ? FIBULA VELOX, sp. nov. Plate XLIV, figs. 7a, 7d. 
Description : 
Height : : ; 3 - Ji mm; 
Spiral angle . : Be Vika 
Shell smooth, conical-subelongate, slide apex acute, spiral angle regular. 
Number of whorls six; height of spire and of body-whorl nearly equal. The 
whorls are flat towards the apex, becoming gradually more convex, whilst the 
body-whorl is sub-tumid, with a rounded periphery; the whorls are quite smooth, 
with close sutures. ‘I'he aperture is angular and oblong, the columella being 
considerably drawn out with a slight anterior twist, terminating in a somewhat 
ill-defined notch. 
Relations and Distribution.—The true relations of this curious shell are not 
very obvious. <A single specimen from the Murchisone-zone of the Cotteswolds ; 
most probably from the Oolite Marl of Swift’s Hill or Longridge. 
443, CERITELLA TUMIDULA, Lycett, 1850. Not figured. And var. angusta. Plate 
XLII, fig. 26. 
1850. CrErirEnna TuMIDULA, Zycett. Ann. Mag. Nat. Hist., 2nd ser., vol. vi, 
p. 419. 
1853. — — —  Proe, Cotteswold Nat. Club, vol. i, p. 86. 
Description : 
Height ; : . lemons 
Body-whorl to total Herel : 5 . 38:100. 
Spiral angle . 5 3 : ; eons 
The following is Lycett’s diagnosis: ‘‘ Small, smooth, much lengthened ; 
whorls flattened, but slightly tumid at their upper junctions; body-whorl 
symmetrical.” 
The number of whorls in the type-specimen (Brodie Collection) is eight ; the 
thickening of these on the posterior margin produces a slight ledge at the suture 
(hence the name twmidula, otherwise inappropriate). 
Relations and Distribution.—Closely related to Ceritella Sowerbii, Morris and 
Lycett, a Great Oolite species, though somewhat more slender than the majority 
of these. In fact, C. Sowerbii is merely a variety of C. tumidula. Rare in the 
shelly freestone at Leckhampton. 
The var. angusta (fig. 26) has a height of 5 mm., and a spiral angle of 24°, 
