214 GASTEROPODA OF THE INFERIOR OOLITE 
N. Guisei was first described from the Clypeus-grit of Rodborough Hill, where 
fragments are numerous, though well-preserved specimens are rare. North of 
these quarries no specimens have hitherto been discovered, but south of Rodborough 
it has been found at several localities, and always in the same part of the Clypeus- 
erit, e.g. (1) Road-side between Symonds Hall Hill and Wootton-under-Hdge; 
(2) Horton Hill (Sodbury) ; (8) Freshford, in the Avon Valley; (4) Twerton Hill, 
near Bath; and (5) in the quarries about Radstock. At this latter locality, 
especially on Clan Down, N. Guisei occurs somewhat abundantly in the form of 
external casts. In this case the spiral lines have been well preserved, and we thus 
obtain an insight into the apical conditions of the shell. 
It has already been indicated in the Introduction that Clan Down is the most 
southerly point whence specimens of the genus Nerinza have hitherto been obtained 
from the Inferior Oolite, and it is worthy of remark that a form in many respects 
exceptional should be the first to reward the collector coming from the south. 
Srotion F.—Folds numerous, complex. 
150. Nerinama (Ptygmatis) CAMPANA, sp. nov. Plate XV, figs. 2 a, 2 b. 
Description : 
Spiral angle (regular) . : : Os 
Height of whorl to width : : ee ena 
Approximate length . : “ . 65 mm. 
Shell cylindro-conical, strongly turrited. Number of whorls about twenty-two, 
very short and deeply excavated anteriorly. The sutural carina, thick and promi- 
nent in the early stages, is sharp and even more prominent in the later ones, 
almost overhanging the preceding whorl. Ornaments unknown. 
The section (fig. 2 4) is not perfectly clear, but the indications are those of a 
Ptygmatis, especially the large square-headed fold in the anterior portion of the 
outer wall. 
Relations and Distribution.—Belongs to the more conical forms of the sub- 
genus Ptygmatis, but easily separated from all by the salience of the sutural 
carine. It is just possible that a specimen figured by me from the Millepore-oolite 
of Whitwell, in Yorkshire (‘ Geol. Mag.,’ dec. iii, vol. 1, pl. iv, fig. 7), is.a flattened 
representative of this species. 
Rare in the Lincolnshire Limestone at Belmisthorpe, in company with Ptyg- 
matis OCotteswoldiz. 
