182 Mr. H. Seeley on new and little-known Hunstanton Fossils. 
brosa (Phil.) and S. Zeppei (Reuss). It is tall, subcylindrical, 
tapering slightly basewards, more or less irregular, occasionally 
contracting, sometimes expanding. Ornamented by cell-hke 
apertures, which are-nearly square, being higher than wide, ar- 
ranged in longitudinal lines, and also necessarily forming circles. 
As it increases in size these longitudinal columns give off at 
intervals lateral branches, so that the cell does not increase in 
size very rapidly. At a diameter of ? inch one example has 
twenty-eight columns of pores. 
Grinding a specimen down, it is seen to be a hollow tube, the 
walls keeping about an even thickness from base upwards, at a 
diameter of 2 inch being nearly } inch thick. The pores on the 
outside pass through the walls and open on the inside. _Inter- 
tubular tissue extremely fine and reticulated. A specimen from 
Hunstanton bed no. 2 is 4 inches long and nearly an inch and a 
quarter wide. It is not rare in the Cambridge Greensand. 
Edaphodus Huczleyi of my list (Annals, Oct. 1864) is only 4. 
Sedgwicki (Ag.). The other new fossils from Hunstanton are 
eminently Cambridge species, and will appear in the ‘ Catalogue 
of Cretaceous Invertebrata in the Woodwardian Museum.’ 
With these descriptions ends the series of papers in which I 
have attempted to illustrate the literature, the rock, and the 
fossils of the Red Limestone of Hunstanton. The considerations 
on which I have chiefly relied in determining its place among 
rocks are the following:—To the north of Cambridgeshire, be- 
tween the Chalk and the Kimmeridge Clay, there are but two 
formations instead of three. Hunstanton Red Rock and Speeton 
Clay in Yorkshire, and Hunstanton Red Rock and Carstone in 
Norfolk, correspond to Greensand, Gault, and Shanklin Sands 
in Cambridgeshire and the south. ‘he rocks are divided dif- 
ferently, and are clearly the result of two very different series of 
causes acting in distinct geographical areas. And as the changes 
of level in which the geological periods terminated were on so 
grand a scale as to change the rock-making material and to 
cause the immigration, emigration, and partial extinction of life 
in what was then the sea of much of Europe, it is almost 
certain that even this little area of the Wolds must have parti- 
cipated to some extent in such vast heaving undulations. And 
therefore the Hunstanton Rock, graduating into both of tbe 
deposits on which it rests, and into that one (the Chalk) which is 
over it, is far more likely to have been parted from the beds below 
by one of those great changes of level which made the Green- 
sand and the Gault than by any independent oscillation, which 
would have been exactly confined to its own little area. There- 
fore it follows that the Carstone formation will be the equivalent 
