200 
The Hijlory of A N I M A L S, 
minute, reddifh papillae : when it is perfedf, there grow from all thefe papilla; ftrawhf, 
long, flender, whitifh fpines, an inch in length, and not thicker than a fmail needle \ 
fo that the whole has much the appearance of a round pincufhion, in which fomebodv 
had fixed as many fine needles as it was poffible, with their points outward. 
It is a very rare fhell, and is a native only of the Eaftern Seas. 
The other fpecies of Centronia, or Echini Marini, are numerous, and may be ar¬ 
ranged under different divifions. 
1. Of the roundifh or fubglobofe ones, called by Klein and fome others Cidares, be- 
fide the fpecies already defcribed, there are, i. The great, round Centronia, with* mi¬ 
nute papilla. 2. The great, round Centronia, with very prominent papillae 3.' The 
little, round Centronia, with elevated papillae. 4. The leffer, globofe Centronia, 
with high papilla. 5. The globofe Centronia, with variolated papilla;. 6. The lit¬ 
tle, globofe Centronia, with larger, variolated papillae. 
2. Of the cordated kind, called by Klein Spatangi, and Spatagoides, there are, be- 
fide the already defcribed, i.'The high-backed Centronia, with five narrow Vays. 
2. The little, ovated Centronia, with the finus very deep. .3. The little, high-backed 
Centronia, with a fhallow finus. 4. The large and fomewhat depreffed Centronia. 
5. The large, very broad, and thin-edged Centronia. 6. The large, depreffed Cen¬ 
tronia, with five elegant broad rays. 
3. Of the flat kind, called Placentas by Klein, befide the already defcribed fpecies, 
there are, 1. The oval, flat Centronia, with two perforations. 2. The round, flat 
Centronia, with three perforations, and the edge fomewhat digitated. 3. The flat, 
undulated-edged Centronia, with four perforations. 4. The rounded, flat, fomewhat 
digitated-edged Centronia, with feven perforations. 
Klein, who has been at great pains to arrange thefe bodies, has divided them into a 
number of other genera, but they may be all conveniently arranged under one or other 
of thefe divifions. Befide the known recent fpecies, we meet with feveral others in 
the foffile ftate, and with the fpines of other equally unknown kinds, many of which 
are of a very Angular figure. 
J 
THE 
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