190 GASTEROPODA OF THE INFERIOR OOLITE. 
later whorls the section is more inclined to be quadrate, giving evidence of the 
absence of preparations for the anterior canal. 
Varieties.—A variety from near Beaminster (fig. 7) is rather more squat 
in figure, has the keel somewhat lower down, and does not expose the rudi- 
mentary lower keel in the penult to such an extent. Another variety (fig. 8), 
from the irony-nodule bed of the Murchisonx-zone in Burton Cliff, differs in an 
exactly opposite direction, being narrower, and displaying the lower keel at a still 
earlier stage than Ps. Etheridgii. Moreover, the crenulations on the keel, and the 
granular zone on the posterior margin, are much more pronounced. This I 
propose to call var. granosa, indeed it is almost worthy of being regarded as a 
distinct species. 
Relations and Distribution.—Pseudalaria Etheridgii occurs somewhat sparingly 
in the Sowerbyi-bed of Bradford Abbas, and has been met with on or about the 
same horizon at Pitcombe. This species may be regarded as the type of a genus 
which has representatives on lower as well as on higher horizons. My attention 
has lately been called by Mr. Edward Wilson to a specimen obtained from the 
Lias, which he regards as identical with Purpurina Patroclus, D’Orb. This well- 
preserved fossil differs from Ps. Htheridgii chiefly in the more decided character 
of the anterior canal, which gives to this part of the aperture an appearance not 
unlike that of the Purpurines. 
119. Psrupataria sucosa, Bean. No date. Plate XII, fig. 9. 
1885. “Trocuus sJugosus,’ Bean MS. Hudleston, Geol. Mag., dee. iii, vol. ii, 
p. 255, pl. v, fig. 11. 
Bibliography.—It was mentioned (loc. cit.) that this could hardly be a Trochus. 
“Tt has more the look of an Alaria without the wing. On the other hand, it may 
represent a shell which never had a wing.’ Attention was at the same time 
directed to Turritella wnicarinata, Desl. 
Description.—Shell conical, turrited ; whorls five or six; suture well marked, 
and situated in a hollow. The whorls of the spire are angular, and slope 
outwards to a very prominent carina situate about two-thirds down. Keels sharp 
and apparently plain. Faint traces of a lower keel may be noted in the whorls of 
the spire; body-whorl strongly bicarinate. The whole of the shell, including the 
base, is marked by fine spiral lines. Other indications wanting. 
Relations and Distribution.—This species somewhat resembles the Beaminster 
variety of Pseud. Htheridgii ; the deficiency of ornament may be due to conditions 
of mineralization. Very rare in the Yorkshire Dogger. 
