478 
THE GEOLOGIST. 
•with very little deviation, to the path which I have chosen through 
the village of Hotham, nearly at right angles to the direction of the 
strata. The Oolites along my route commence at Hotham Quarry 
with what I believe to be the lower portion of the Inferior Oolite ; for 
it answers, with considerable exactness, lithologically as well as 
zoologically, to the "Pisolite" or " Eoestone " of the neighbourhood 
of Cheltenham, which has been hitherto affirmed to be a local formation 
limited to that special vicinity. They end, after a breadth of about 
three-quarters of a mile, where the Kelloway Rock is succeeded by 
the Eed Chalk under the edge of the wold at Brewton, — ^both of 
these deposits being very rich in their distinguishing forms of organic 
remains, and corresponding to their equivalents in Wiltshire and 
Norfolk. I shall confine myself, therefore, in this paper to the geology of 
Hotham, and to stating, as summarily as possible, my reasons for 
thinking that Hotham Quarry is in the Inferior Oolite— & formation 
which, therefore, is not wanting in this long uncertain district of 
Cave, though its appearance here is somewhat strange and degenerated, 
and implies a peculiarity in its deposit. 
The Hotham Oolite, in the Upper part, is a white-coloured, thin- 
bedded rock, coarse and fissile, and of a decided "roe-stone" aspect, 
which, somewhat lower, becomes largely intercalated with layers of 
sand, and is seen at the base of the section, which is probably nowhere 
twenty feet deep, to have become altered into a thick-bedded sandy 
freestone. Its fossils cannot be said to be plentiful. Most frequently 
we find broken remains of Echinodermata, such as occur in the 
" Pisolite " of the Cheltenham Inferior Oolite ; and, so far as I am a 
judge of the associated moUusca, they go to confirm the testimony of 
the urchins, and the evidence from " pisolitic " appearances. I subjoin 
a list which I have succeeded in collecting, not without a good deal of 
attention and perseverance ; and, like all other fossils recorded in this 
paper, they wei'e obtained (with the exception of one) with my own 
hands. Undoubted specimens, generally in bad preservation, of Pygaster 
semisulcatus, which is perhaps the most common form of all ; a large 
flat Chjpem, so like at fiirst sight to Hijloclypm agariciformis as to 
deceive an experienced eye, but distinguished upon close inspection by 
the character of the ambulacra and poriferous zones — I consider it to 
be the Clypeus Michelini of Wright, but I have never found a good and 
sound example of it, although bits of its test are not rare ; a cast of (?) 
Acrosalenia ; a species of Pseudodiadema, (not depressum,) only known at 
present in a mould ^ ith a small remnant of the test upon it ; slabs 
with plvites and spines of urchins, Pentacriuites, and Millepores ; Hinnitet 
