CIRRUS. 311 
A single specimen, said to be from the Oolite Marl, may fairly be regarded as a 
member of the Leachi-group, but it would be going a long way in “ lumping’”’ to 
describe it even as a variety of Cirrus Leachi. No species of Cirrus has, to my 
knowledge, been found either in the Lincolnshire Limestone or in the beds of 
Inferior Oolite age in Yorkshire. 
244, CIRRUS PYRAMIDALIS, Tawney, 1873. Plate XXIV, figs. 18, 19, types refigured ; 
fig. 20, variety from the Cotteswolds. 
1873. Crrrus PYRAMIDALIS, Tawney. Dundry Gasteropoda, p. 37 (29), pl. ii, 
figs. 10a, 108. 
Non — — _— sp., J. Buckman. Proc. Dorset N. H. 
Field Club, p. 189, pl., fig. 5 
Description : 
Length : : . 30mm. 
Height of body- Aiea to total tenth ; . 40: 100. 
Spiral angle (mean) about 65°. 
Shell sinistral, turbinate, moderately canbilieated: Spiral angle concave ; 
apex acute, but extreme apical conditions unknown. Number of whorls about 
ten or eleven; the apical ones are nearly flat, but with the sudden increase in the 
width of the spiral angle become convex, with a basal keel moderately developed, 
below which the sutures have rather a tendency to gape. The ornaments consist 
of a number of fine wavy spirals, which decussate with very numerous closely-set 
oblique growth-lines. Rugose axial coste extend from suture to suture in the 
earlier whorls, but fail quite to reach the anterior margin in the penult. 
The body-whorl is very ventricose, with one strong keel at the angle of the 
whorl, which the axial cost just fail to reach. Numerous fine undulating lines 
represent the spiral ornamentation, and one of these lines is sometimes of 
sufficient prominence to form a slight posterior keel. The base is rounded, and 
full of fine reticulate ornament, and the margin of the umbilicus is corrugated by 
low radial coste not always perceptible. Aperture circular, expanding, and 
adherent. 
Relations and Distribution.—It may be doubted whether this is anything more 
than a local variety of the species next described. The differences are mainly 
those of ornamentation, but in the form now under consideration the whorls are 
less turbinate, the body-whorl is more angular, the habit of growth smaller, and 
the spiral lines much finer and more close-set. Rare at Dundry. A variety 
(fig. 20) occurs in the Cotteswolds. 
