14 
equal half the width of the larger, both being ornamented with papillae 
of a proportionate size ; but, like the latter, its papillae are perforated 
in the apex, and crenulated at the base ; and this is the case even 
with those papillae which are disposed on the less areae. The pores 
of the ambulacra, as in the former, diminish in number as they 
ascend ; and, as in the latter, are closely bordered by granular tubercles. 
It should perhaps be considered as a variation of C. papillata. 
Of Cidarites coronalis it is impossible to speak with decision, the 
specimens have been so rare and the descriptions so meagre. C. 
corbllaris, Plate I. Fig. 7> specimens of which have been so generally 
spoken of among the early oryctologists, as ombrice and ceraunice, is 
evidently, as is very justly remarked by Leske, merely a silicious 
nucleus. These nuclei vary in the figures and markings : they are 
all, however, rather orbicular ; but some are much more depressed 
than others. But their differences are not such as can at all oppose 
the opinion, that they are casts of different species of C. miliaris or 
variolata. The large protuberance in the middle of each side, is 
evidently formed by the excess of silicious matter, beyond that which 
was necessary to fill the shell. 
With equal accuracy does Leske suggest, that the assumed genus 
of Klein, of C. asterizans, does not merit the being considered as 
even a distinct species : and I am happy in being able, I conceive, to 
point out the genus, at least, to which this fossil may be referred ; 
which seems to be that of C. variolata. 
In the remarkably perfect specimen of a variation of C. papillata, 
Plate I. Fig. 6, a view is obtained of the verrucous appendage, which, 
in perfect specimens, is frequently found surrounding the superior 
opening of the anocysti : of the use of which appendage, notwith- 
standing the conjectures of Klein, it must be admitted that nothing is 
known. A reference to this peculiar organization, it is hoped, will 
assist in explaining the riddle which Walch and Leske, with M. 
Genzmer, have found so puzzling. In Knorr’s splendid work, Supp. 
