324 MISS DONALD ON PROTEROZOIC GASTEROPODA [ May 1902, 
Knockmahon, Tramore (Waterford). I have seen the fossil to which 
he refers in the Museum of Science & Art, Dublin; it is merely a 
cast, and admits of no precise comparison. The Rev. M. 8. Donald 
has external casts from the Kirkby-Moor Flags, Lily Mere; and 
there are also several external casts in the Woodwardian Museum, 
Cambridge, from the same beds at Benson Knott, Kendal. 
CYRTOSTROPHA SCITULA, sp. nov. (Pl. VII, figs. 7, 7a, & 8.) 
Diagnosis.—Shell elongated, turreted, composed of more than 
eleven whoris. Whorls increasing somewhat gradually, slightly 
angular below the middle, especially in the earlier stages of growth ; 
contour convex both above and below the angle, convexity greater 
in the later whorls. Band situated on the angle, grooved and 
limited on each side by a keel. Lines of growth fine, curving back 
to the band above and forward below at a moderate angle, not 
seen on the band itself. Ornamentation consisting of several spiral 
raised threads, a strong one being situated about midway between the 
band and the suture below, and another above, bounding a slight 
depression between it and the band; there are also two or three 
finer threads between this and the upper suture. Sutures deep. 
Aperture unknown. 
Remarks and Resemblances.—tThis species greatly resembles 
C. corallii in the contour of the whorls and in its occurrence 
embedded in coral, and it may possibly be a variety of that shell. 
It differs in having a greater spiral angle and more evenly convex 
whorls which are not adpressed at the suture, in the band being 
deeply grooved, rather narrower, and its limiting threads being 
stronger ; also the thread below the band 1s not so strong, and occurs 
midway between the band and the suture, instead of immediately 
above the latter. It is distinguished from Murchisonia bicincta, 
M‘Coy, by its greater robustness, and in the band being higher 
above the suture and bounded by stronger keels. 
Dimensions and Localities.—None of the specimens of this 
species with which I have met have the aperture preserved, and they 
are all embedded in coral, with the exception of a small external cast 
from Spital, Kendal, in the Woodwardian Museum, Cambridge, which 
is probably this species, though not well enough preserved to admit 
of precise determination. The largest is in the Piper Collection, 
Natural History Museum, South Kensington: it has about seven 
and a half whorls preserved, with a length of 27 millimetres and 
a width of 93 mm. It was found at Frith, Ledbury. 
A specimen (PI. VII, fig. 7), consisting of eleven whorls, is in the 
Grindrod Collection, University Museum, Oxford. It has a length of 
20 millimetres and a width of 9 mm. ‘The locality is not recorded, 
but the fossil is probably from the neighbourhood of Malvern. 
In the Worcester Museum there is a very young individual, 
consisting of eight whorls, the length of which measures 6°5 milli- 
metres, and the width 8mm. It was found in the Upper Ludlow 
of Chance’s Pitch, Malvern. 
