PLEUROTOMARIA. 
285 
and that in February, 1842, Sir R. Murchison, in bis presidential address to 
the Geological Society, mentions it as soon to be published, whereas there is 
internal evidence in the ' Neues Jahrbuch ' showing that Sandberger's paper was 
certainly not published till after April 10th, and probably much later in the year. 
It seems, therefore, best to follow Goldfuss, who first united them, and writing 
only two years afterwards gave the precedence to d'Archiac and de Verneuil. 
There is, I think, no doubt that both the shells described by these authors are of 
the same species. 
Whether Fl. Beaumonti, d'Archiac and de Verneuil, is, as Sandberger supposes, 
a variety of the same shell is more doubtful. Its figure, at first sight, seems to 
suggest an ornament of close threads as in Mr. Champernowne's specimen of 
PI. impendens, Sowerby, with which I at first identified it. On closer comparison, 
however, of the figure and description I am disposed to think that this appearance 
is misleading, and that really the ornamentation is much the same as in Sand- 
berger's PI. decussata ; and moreover, while our figured specimen clearly belongs 
to that species, it presents decided approximation to PI. Bewmnonti, especially in 
the shape of the columella and the mouth. I am, therefore, now disposed to follow 
Sandberger in uniting it with this species. If this is so, Mr. Champernowne's 
fossil shows that PI. Beaumonti cannot be a synonym of PI. impendens, as that is 
quite different from the present form, being a much larger shell, and having many 
more spiral threads which are closely arranged instead of being separated by 
broad furrows. 
We may note that in our figured specimen the transverse threads are very 
well marked, being rounded and raised so as to be almost unbroken by the 
intersecting spiral furrows, and about their own distance apart. On the whole 
they are twice as close as the spiral threads except where smaller intermediate 
spiral lines exist ; but in another Torquay example they are hardly more numerous 
than the spiral threads. 
Affinities. — In ornamentation and shape this species closely resembles Euom- 
phalus granulatus, Miinster,^ but as that author refers his species to Euomphalus 
we must suppose that it had a large open umbilicus, and therefore was quite 
distinct from the present form. It is a decidedly lower shell than our specimens, 
and Miinster's description leaves no room, if at all accurate, for any sinus-band. 
PI. cancellata, Phillips,' is very slightly described from South Petherwyn and 
Newton. Two imperfect specimens are figured ; one of which is evidently from 
Wolborough, and is a very much larger shell with more rapidly increasing 
whorls and much less oblique reticulations, and clearly is different. The second 
figure, on the other hand, is about the same in general form, but the sinus-band is 
1 1840, Miinster, ' Beitr.,' pt. 3, p. 86, pi. xv, figs. 19 a, h. 
2 1841^ Phillips, ' Pal. Foss.,' p. 96, pi. xxxvii, figs. 176 a—c,f. 
