GASTEROPODA. 39 
volution, between which and the suture is the sinuation curving backwards. Considering 
it different, I have given to it the above specific name. 
Puevroroma scanaris? Meller. Supplement, Tab. III, fig. 12 
DEFRANCIA scALARtIs, Moll. Ind. Moll. Groenl., p. 12, 1842. 
Locality. Upper Glacial, Bridlington. 
This was also sent to me by Mr. Leckenby, and with the specimen is a label on which 
is written, “considered by J. G. J. to be a large example of Mang. pyramidalis.” It 
seems to correspond with the description given by Moller of his species sca/aris, and I 
have ventured, with a doubt, to refer it accordingly. 
Mangelia cinerea, Moller, is given in Woodward’s List as a species from Bridlington, 
which I have not been able to find. The nearest approach to civerea is a shell represented 
in ‘Crag Moll.,’ vol. i, p. 64, Tab. VII, tig. 15, as Olavatula plicifera. 
Defrancia cinerea, MOll., in British Museum | is probably an elongated var. of scealaris. 
These forms all depart from twrricuda in the absence of the prominent shoulder of that 
species. 
Prevrotoma Dowson, S. Wood. Supplement, Tab. II, figs. 13 and 14. 
Spec. Char. Pl. Testa ovato-fusiformi, clathrata ; anfractibus convexis, tumidiusculis, 
guata suturam angulatis, longitudinaliter liners eminentibus cinctis, transversim plicatis ; spira 
breviore. 
Length, ~oths. 
Localities. Chillesford bed, Aldeby. Middle Glacial, Billockby, and Hopton ? 
Upper Glacial, Bridlington. 
One specimen was sent to me as from Bridlington, fig. 14, by Mr. Leckenby, and 
another, fig. 13, from Aldeby, was found by Messrs. Crowfoot and Dowson. They approach 
the recent exarata of Moller, but are shorter and much more tumid. ‘These two 
specimens are in excellent preservation. About a dozen specimens of a shell from the 
Middle Glacial of Hopton and Billockby appear to belong to this species, but they are too 
much mutilated to enable me to refer them to it without a note of interrogation. They 
agree in the tumid form, and in so much of the sculpture as is preserved, their ribs being 
fewer than those of proxima. I have named the shell after Mr. E. 'T. Dowson, of 
_Geldeston, to whose industry, in association with Mr. W. M. Crowfoot, of Beccles, we 
are indebted for so complete a fauna of the Aldeby deposit. 
