EXELISSA. 179 
Eparcy; the apex also is somewhat more obtuse. The ribs are wider apart, the 
last whorl somewhat less constricted, and the aperture less filled up, and not 
quite so circular. There are eight costa, which are decussated by about as many 
fine spiral lines. This variety differs from the type exactly in the opposite direc- 
tion to Hx. pisolitica, but is, on the whole, nearer to the Great-Oolite forms. 
Rare in the Lincolnshire Limestone of Weldon, where poorly preserved speci- 
mens are difficult to distinguish from bad specimens of Cerithiwm subcostigerwm. 
108. Exetissa puncura, Lycett, 1863. Plate XI, fig. 7. 
1863. Kitvertra putcura, Lycett. Suppl., pp. 10 and 94, pl. xliv, fig. 4. 
The following is Lycett’s description: ‘Shell small, thick, elongately turrited 
(?); volutions eight, convex, the sutures deeply impressed; transverse (i. e. 
axial) coste about twelve in each volution, oblique, large, decussated, and 
rendered nodulous by six narrow encircling lines; . . . . the figure of the 
aperture in shells of the same size presents some yariability, the typical sub- 
orbicular figure becomes subquadrate, and in other instances is somewhat pointed 
at the two extremities, but in the young condition apparently the aperture is 
always orbicular.” 
As I have not had an opportunity of seeing specimens of Hv. pulchra either 
from the Great Oolite of Minchinhampton or from the Forest Marble of Laycock, 
there may be room for doubting the present identification. But certain shells 
from the Lincolnshire Limestone at Ponton answer very well to Lycett’s figure and 
description. This case affords another instance of the resemblance in Ponton 
fossils to Bathonian forms. 
109. Exettssa Wexponis, Hudleston—Correction of name. Plate XI, figs. 8a, 8b. 
1884. Cxrrtraium (Kinvertta) Compronense, Hudl. Geol. Mag., dee. iii, vol. i, 
p- 62, pl. in, fig. 14. 
Bibliography, Sc.—By inadvertence this species, so characteristic of the 
Lincolnshire Limestone of Weldon, received the specific name of ‘* Comptonense.” 
Description.—Length about 6 mm., width less than one-third of the length. 
Shell pupeform ; whorls six to eight, sutures not very distinct in the spire. The 
ornaments are more conspicuous spirally than longitudinally. In the majority of 
specimens are three spirals, the upper and lower of which, but sometimes all three, 
