C *4-6 ] 
Bodies of the Thicknefs of a Pin, but of different 
Lengths, fo as to appear like the Teeth of a Comb, 
or the Gills of a Fifh - y the Interftices between all 
which is a rugged ftony Work, and Hollows per- 
vading quite through the Body to the upper Part. 
I cannot but think thefe five pectinated Divilions 
on the Bails owe their figure to fome Parrs of the 
included Fifh; which I am more confirmed in, as I 
have feen fome Specimens of the common pileated 
and galeated Echinites , which have been hollow'd 
at their Apex, and mark'd ftar-wife ; that Concavity, 
and theftellar Mark proceeding from the Interpofition 
of the Fifh between the ftony Matter then filling the 
Shell, and the Top of the Shell itfelf. 
The other Echinite I have the Honour of pro- 
ducing before the Society , belongs to Mr. Edward 
Jacobs of Eeverjham. It is of a different Species, 
though of the lame Genus , of a heart- like Shape, 
and about one third the Size of the above-deferibed. 
This is greatly copped, the Apex lying very high, 
and the five Divilions running near perpendicularly 
down to the Edge. The upper Part of this is ele- 
gantly perfect 3 the Work is near the fame as on the 
other jonly that, by the Perfection this preferved is in, 
we obferve that the Rows of parallel Ridges, which 
adorn each Side of each Leaf or Divifion, rife into 
a kind of arch’d Work or Bridge, made up of arch'd 
cylindrical Bodies, through which the middle Row 
runs, joined or connected in a long ftrait cylindrical 
Stem, in a mod curious and elegant manner. The 
Bafis or under Part of this Specimen is very imper- 
fect, and only feems to differ in the Center being 
greatly excavated or concave, anfwering to the great 
Copping 
