NATICA. 
255 
192. “ PhasiaiVella ” cf. subumbilicata, UArchiaCi 1843. Plate XIX, fig. 15. 
1843. Natica subumbilicata, d'Archiac. Mem. Soc. Geol. France, vol. v, 
p. 378, pi. xxviii, fig. 11. 
1852. Phasianella — d'Orhigny. Terr. Jur., ii, p. 321, pi. cccxxiv, 
figs. 8 — 10. 
1884. — — d'Archiac, sp. Cossmann, Ft. Bath., p. 254. 
Description of the specimen : 
Spiral angle .... 60°. 
Height of body-whorl to entire shell . . 65 : 100. 
Length . . . . .14 mm. 
Shell short, ovate, slightly tnrrited. Whorls five or six, smooth, narrow, tumid, 
and slightly disposed in steps. Body-whorl very large and rounded, but not 
exceeding the limits of the spiral angle. Aperture subcircular to oval ; indica- 
tions of an umbilical groove. 
Relations and Distribution, — This form is first cousin to Natica subumbilicata, 
D’Archiac, from which it differs in its larger habit of growth, in the greater height 
of the spire, and in its less globose outline. It belongs to a section of “ Phasianella ” 
which has a general resemblance to the Jurassic Naticas. A single specimen from 
the Lincolnshire Limestone, Weldon. 
193. “ Phasianella,” species or variety. Plate XIX, fig. 17. 
Description of the specimen : 
Spiral angle . . . .55°. 
Height of body-whorl to entire shell . . 70 : 100. 
Length . . . . .5 mm. 
This micromorph, of which only a single specimen is in my possession from the 
Lincolnshire Limestone of Weldon, presents characters not dissimilar to those of 
Ph. Leymeriei, D’Archiac, and it also has some resemblance to the larger species, 
Ph. nuciformis, Morris and Lycett. 
P'amily—NATIGI'DM. 
“ Shell turbinate or ear-shaped ; aperture entire, columella thiclcened or callous ; 
lip thin . . . — Fischee. 
There are a considerable number of shells in the Jurassic rocks which may 
safely be referred to the Naticidse. Their generic grouping, however, is not quite 
