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Entrochi, and Asterice, I shall consider them, and shall most commonly 
speak of them, as vertebra, joined or disjoined ; and pentagonal 
or cylindrical ; and instead of stirts or wires, we shall mark the processes 
which go off laterally from the trunk, by the terms vertebral 
APPENDICES or PROCESSES. 
The basin formed at the superior part of the trunk, by that which 
is termed the pentagonal base by Rosinus, and in which there is every 
reason to suppose that the organs for the reception and the digestion 
of aliment were placed, I shall term the pelvis : and the sub- 
stances, by which it is formed I shall consider as ribs, clavicles, 
and scapula:. The articulated parts, not longitudinally divided, 
proceeding from these, I shall consider as the arms ; when divided, 
the hands formed of fingers; and the innumerable, articulated ap- 
pendices, proceeding from these, the tentacula. The remains of 
the vertebral column of these animals are so numerous, and at the 
same time so varying in their forms ; and, in consequence of their 
being seldom found united to the other parts of the animal, can so 
rarely be classed, with any certainty, with the species to which they 
belong, that it appears to be advisable to examine them first generally, 
and afterwards to point out, as nearly as may be, those which belong 
to the several species of this animal which may fall under our ob- 
servation. 
Small stony bodies of a circular form, some very thin, others cy- 
lindrical, and others almost orbicular, marked on their flat surfaces, 
with minute strise ; and on their margins, with small indentations and 
projections, have been long found in the earth, in different parts of the 
world, and have acquired different names, according to the whims 
and caprice of the vulgar. In Germany, they have been named Span- 
gensteines, from their likeness to the beads of a necklace ; and Roeder- 
steines, from their rays passing from the centre to the circumference 
like the spokes of a wheel. In Upper Saxony, they are known by the 
appellation of Bonifacms Pfenninge, or St. Bonifacius’s money ; they 
