260 
GASTEROPODA OP THE INFERIOR OOLITE. 
Shell Euspiroid ; length to width as 4:3; without visible umbilicus. Spire 
in well-marked steps ; . whorls of the spire (5 — 6) convex, narrow. Body-whorl 
large, angular, and mesially prominent, with some spiral lines at wide intervals, 
and numerous curved lines of growth. Aperture semilunar and rather effuse. 
Relations and Distribution. — The points in which this form differs from Natica 
adducta are mainly those of proportions. But these differences are considerable, 
and correspond in the main to the differences indicated by d’Orbigny for Natica 
Lorieri. Intermediate forms connecting this with N. adducta occur, so that it is 
sometimes difficult to decide. The specimen figured is from the beds at Cold 
Comfort near Cheltenham. There are others from Bradford Abbas, and forms 
not dissimilar occur in the Inferior Oolite at Hook Norton. 
Var. PEOxiMA, Hudleston, 1882. Plate XX, fig. 7. 
1882. Natica peoxima, Hudleston. G-eol. Mag., dec. 2, vol. ix, p. 200, pi. v, 
fig. 8. 
Description : 
Spiral angle . . . .75°. 
Height of the body-whorl to entire shell . . 70 : 100. 
Shell oval, subumbilicate. Whorls six, regular, smooth, and slightly tumid. 
The sutural ledge is narrow, with only a slight canaliculation. Aperture oval ; 
umbilical fissure distinct, with a considerable callus on the inner lip. 
The presence of an umbilicus seems to connect this form more nearly with 
that of d’Orbigny’s Natica Lorieri than the one last described. In this variety 
the whorls are less tabulate and the general outline differs. 
Var. CANiNA, Hudleston, 1882. Plate XX, figs. 9 a, 9 b, and ? fig. 1. 
1882. Natica adducta, Phil., var. canina, Hudleston. GfeoL Mag., dec. 2, ' 
vol. ix, p. 200, pi. V, fig. 7. I 
? — — — Greol. Torks., pt. 1, pi. xi, fig. 35. 
I 
The proportions approach somewhat those of the shells referred by me to ^ 
Natica Lorieri ; but if it should turn out that d’Orbigny’s name is inadmissible 1 1 
would propose to call them all Natica canina. There is no trace of umbilicus ; i 
the mesial bulge in the body-whorl is the same as in the Cold Comfort shell, and ' 
