486 GASTEROPODA OF THE INFERIOR OOLITE. 



442. ? Fibula velox, sp. nov. Plate XLIV, figs. 1 a^lh. 



Description : 



Height . . . . .11 mm. 



Spiral angle ..... 42°. 



Shell smooth, coiiical-subelongate, solid ; 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. The 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 Marchisonae-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 



XLIII, fig. 26. 



1850. Ceritella tumidxjla, Lycett. Ann. Mag. Nat. Hist., 2nd ser., vol. vi, 



p. 419. 

 1853. _ _ — Proc. Cotteswold Nat. Club, vol. i, p. 86. 



Description : 



Height . . . . .11 mm. 



Body- whorl to total height . . . 38 : 100. 



Spiral angle ..... 30°. 



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 tumidula, otherwise inappropriate). 



Relations and Distrihution. — Closely related to Ceritella Soiverhii, Morris and 

 Lycett, a Great Oolite species, though somewhat more slender than the majority 

 of these. In fact, G. Soiverbii is merely a variety of G. tumidula. Rare in the 

 shelly freestone at Leckhampton. 



The var. anrjusta (fig. 26) has a height of 5 mm., and a spiral angle of 24°, 



