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the large Echinite , and the upper Part of the fmall 
Echinite : All which are ingraved in Tab. IV. 
I am, with Refpect, 
London, April 27, 
1749. 
SIR , 
Tour very devoted, and 
obliged humble Servant , 
Emanuel Mendes da Cofta. 
References to the Figures. 
See Tab. IV. 
% 
Fig. 1. A View of the upper Part of a curious 
Echinite , in the Pofifeflion of Mr. Edward Ja- 
cobs, of Feverjham in Kent. 
Fig. 2, A View of the under Side of the fame 
Echinite. 
Fig. 3. A View of the under Side of a curious 
large Echinite, in the Pofieflion of the Right 
Rev. Dr. George Lavington, Bifhop of Exeter. 
FI. B. The upper Part of this Echinite having 
nothing remarkably particular or different, it 
was not judged ncceflary to give a Figure of it. 
XII. 
