178 GASTEROPODA OF THE INFERIOR OOLITE. 
so well formulated by Lycett, although Piette’s name appears to have the priority. 
Fischer places this genus with a query under the Cerithiide. 
These curious little shells are by no means abundant. Jzelissa numismalis is 
described by Tate from the Lower Lias. The ornaments of this species are not 
very characteristic, and, as usual with Lias specimens, the character of the aperture 
is not well-defined. Four species were recognised by Lycett in the Great Oolite, 
one of which, Hz. strangulata, D’Arch., is regarded as the type of the genus. All 
four are recorded by Cossmann as occurring in the Bathonian of France. 
In the Inferior Oolite of this country there are three if not four species of 
Evelissa, two of which are closely allied to, and possibly in one case identical with, 
Bathonian species. 
107. Exexissa strancunata, D’Archiac, 1843, Inf.-Ool. Varieties. Plate XI, figs. 
5 a, 0 6, 6. 
1843. CrRITHIUM sTRANGULATUM, D’ Arch. Mém. Soc. Géol. France, t. v, p. 382, 
pl. xxxi, figs. la, b. 
1851, — — —_— Morris and Lycett, Great Ool. Moll., 
p- 31, pl. ix, fig. 18. 
1863. Crriruium ? (Kinverria) straANGuLAtuM, D’Arch. Lycett, Suppl., pp. 8 
and 94, pl. xliv, fig. 2. 
Bibliography, Sc.—lLycett’s figure in the ‘ Supplement’ is good, showing the 
straight, thick ribs characteristic of this species. He says (p. 8): ‘‘ The present 
specimen, which agrees more nearly with the example figured by D’Archiac, has 
seven longitudinal costz, which are conspicuous even to the base.” 
Var, Pisonirica (figs. 5 a, 5 0). 
Length about same as in specimens of Ez. strangulata from Eparcy (8 or 9 
mm.), figure rather more slender, and apex less obtuse. The ornamentation differs 
considerably. In the var. pisolitica the longitudinal costz are not quite so regular, 
and straight ; moreover the granulations of which the coste are built up are larger 
and about half as numerous ; they correspond in fact to four or five spiral lines on 
each whorl instead of at least eight as in Hz. strangulata. The contracted, pupeeform 
aperture, with its prominent lips, is alike in both; but this, of course, is a generic 
feature. 
This variety occurs rarely in the lower part of the Inferior Oolite of the 
Cotteswold, and chiefly in the Pea-grit. 
Var. Ovatis (fig. 6). 
About 8 mm. in length, this variety is broader than typical specimens from 
