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LETTER III. 
CATOCYSTI, DIVIDED INTO FIBULAE, CASSIDES, SCUTA, AND PLA- 
CENTAS FIBULA, SUBDIVIDED INTO CONULI AND DISCOIDES 
CASSIS, SUBDIVIDED INTO GALEAE, AND GALEOLAE, INCLUDED IN 
ECHINOCORYS SCUTUM, ECHINANTHUS PLACENTA, ECHINO- 
DISCUS ECHINOCYAMUS. 
W e now arrive at the second grand division, or family, of Echini, 
Catocysti, the opening for the vent of which is in some part of the 
base of the shell. The first section under which these are arranged 
by Klein is that of Fibula, a name which is generally adopted ; 
although the echini it includes bear no resemblance to fibulae, but 
rather to clothes’ -buttons, to which the word is now made to apply. 
These echini are divided into two genera. The first, conulus, contains 
those which rise from a circular base into a cone, with an acute or 
obtuse vertex, from which five pair of punctated or crenulated lines, 
or ambulacra, pass, dividing the shell into five large and five small 
areae, that in which the anus is placed being rather the largest. By 
some oryctologists these have been termed JBufonitce and Scolopen- 
dritce, and by others, Pilei ; and by the English Capstones. 
The species which constitute this genus are only known as fossils, 
and are so variously distinguished by the modification of their forms, 
and by other little circumstances, as to render their varieties too 
numerous to admit of being specified. 
Conulus albogalerus, Lesk. E. albogalerus, Linn, deriving its name 
from the white conical caps of the priests of Jove, is the first species 
