10 
by Leske, to have been frequently found fossil ; he believing it to be 
figured as a fossil by Plot, Nat. History of Oxfordshire, PI. V. Fig. 
5 ; and copied by Lister, de lapid. turhin. Fig. 23. To this species 
he also refers the echinites figured by Bourguet, Traite des Petri- 
fications, Fig. 336, as well as some of the echinites figured by Abilgaard 
and one or two others. C. hemispherica, which is however very 
properly suspected by Leske to be only a variety of Echinus escu- 
lentus, is, as was observed of that species, not a frequent fossil : it is, 
I believe, depicted as such by Walch only, Monum. des Cat. PI. E. II. 
Fig. 1 ; and copied by Leske, Tab. xl. Fig. 7 • G. angulosa appears 
also to be depicted by Walch only, Monum. des Cat. PI. E. II. Fig. 5. 
The specimen is of the small variety. Leske describes and figures a 
small echinite, a variety of this species, echinites excavatus, from 
Verona. Another fossil from that place, which I possess, seems to 
be another variety of C. miliaris saxatalis, apparently echinus g ratilla, 
Linn. Its characters are, ten ambulacra, with three rows of double 
pores, and five broad and five narrow arese. 
The above are considered by Klein as comprised under the genus 
miliaris, from their tubercles being of the size of millet-seeds. Those 
which we have next to examine, he considers as forming a genus, 
which he names variolata, from the size of the tubercles, and have 
been supposed to resemble the Turkish turban. Cidaris diadema, of 
this genus, does not appear to have been known to exist in a fossil state. 
The echinite, Plate I. Fig. 4, from Wiltshire, approaches, however, 
very nearly to this species. It has ten areee : in the five larger are two 
rows of tubercles ; those just above the margin being large, and those 
above and below these gradually diminishing. These tubercles aie 
all pierced in their apex, and have the margin of their base crenulated, 
as in those of the next genus, and surrounded by a granulated surface. 
The smaller arese project beyond the larger, and are formed of tw T o 
rows of miliary tubercles. The ten ambulacra are porous, each being 
formed by two rows of pores disposed in pairs. 
