BOURGUETIA. 249 
186. Bourcuetia sreiata, Sowerby, 1814. Plate XIX, figs. 8, 9. 
1814. Menanta strrara, Sowerby. Min. Conch., p. 101, pl. xlvii. 
1851. PHASIANELLA STRIATA, Sowerby. Morris and Lycett, Great Ool. Moll., 
p- 118, pl. xv, fig. 19. 
1852. —_ — @Orbigny. Terr. Jur., ii, p. 322, pl. ceexxiv, 
fig. 15, and pl. ecexxy, fig. 1. 
1858, ~ S#MANNI, Oppel. Juraformation, p. 387. 
1871. Boureverta striata, Sowerby. Terquem and Jourdy, Bath. Moselle, 
p. 51, pl. ui, figs. 21, 22, 23. 
1884, “ PHastANELLA” striata, Sowerby. Hudleston, Geol. Mag., dec. 8, vol. i, 
p. 49. 
Bibliography, §c.—It is not a little significant of the vertical range of this 
species, that the type figure is compounded of two parts, the upper portion from 
a specimen found at Lymington’ in Somersetshire, the lower from the Coral Rag 
of Goatacre. 
MM. Terquem and Jourdy, perceiving the objections to placing Sowerby’s 
species under any of the genera to which it had been referred, adopted Deshayes 
MS. name. On the whole they were disposed to regard the new genus as being 
more nearly allied to Natica than to Melania. Fischer has no difficulty in refer- 
ring B. striata to the Pseudomelaniide. 
Description—The spiral angle may be taken at from 35°—40°, but with con- 
siderable variation either way. Extreme length nearly 200 mm., the shell being 
about two and a half times as long as wide. In some specimens the spiral angle 
is regular (fig. 8), in others convex and giving a pupoid appearance (fig. 9). 
Shell substance thin. Whorls nine or ten, tumid, with a deeply impressed suture, 
spirally striated; the stris rather unequally distributed, the most deeply im- 
pressed and the widest apart being anterior. 
The body-whorl is somewhat less than half the height of the entire shell, 
ventricose, with rounded base. The spiral stria or grooves are continued through- 
out the base, being much deeper and wider apart anteriorly. 
Varieties are numerous. The figures represent two medium-sized specimens 
from the Murchisone-zone of North Dorset. These may be said to constitute a 
good local variety, if not a distinct species; the strie are numerous and the 
whorls, especially in the pupoid form, very convex. This I propose to call var. 
! With reterence to this place Mr. H. B. Woodward writes as follows :-—‘ Lymington is one 
mile east of Ichester on Lower Lias Clay, with here and there small patches of river gravel brought 
down by the River Yeo. I have seen and mapped some of these gravels, and know they contain 
much Oolitic material. Tributaries even now rise at the base of Corallian rocks ; so you have at any 
rate choice of Inferior Oolite or Corallian for the Lymington specimen.” 
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