The fpecies b, b, has more refemblance to the head or bill of a bird j anu the 
action of all of them in the water is very like to that of poultry picking food : c>c ’ 
are curioufly jointed tridents, which turn and bend every way, as occafion req ull ‘ eS 
the bills to be exercifed. 
The fpines a. A, if inftruments of motion, are not its only ones ; for it 
altogether incapable of moving or turning itfelf, unlefs by the aid of a particol ar 
kind of tentacula, wherewith it is alfo furnifhed, many hundreds' in number. 
have each of them a fucker at the extremity, as magnified in the fpecimens e> c,C> 
with which it lays hold on the rock, and by extending and contracting of thefe, C?I J 
fufpend or move itfelf at pleafure. The Ihell or cruftaceous covering of the intefti^ 
part of the animal is full of pores, difpofed in ten triple rows, as k, K. Throng* 1 
thefe perforations the numerous nerves extend, which give energy to the operatic 5 
of the feveral orders of the above organs. 
The duller oflittle polypes, with the large fucker at E, is a fpecimen of on e > 
ten peculiar organs, which more immediately furround the mouth. Thefe a re 
enclofcd by two other rows of a limilar nature, but more {lender texture, but f e£l 
all engaged and bufy, in their feveral fun&ions, in this wonderful apparatus of 
Their fituation, round the aperture of the mouth, is reprefented at G. 
The very elegant form of the bones of the mouth feemed worthy of a fe p 31 " 3 ^ 
delineation, and are reprefented at H and I. 
The figure B, is the natural fize of a very fmall Echinus. They are f°^ 
on this coall of all dimenfions, from that of a pea to that of a pine-apple. ^ ' ' 
moll common fize of full-grown ones feems to be from three to four i* 1 ^ 
diameter. They inhabit the deep pools, and obfeure clefts among the r ° c 
keeping always confiderably within and under low-water mark. 
To have objects of admiration often placed before our view, is a certain encreai" 
to the enjoyments of life. The cultivating of a tafte for the elevated entertaintf^ 111 ^ 
thefe afford, enlarges the fphere of human happinefs, and ennobles the hours 0 
leifure. For this, the ceconomy of nature, in the fubmarine regions, will op en ‘ 
many inftances a yet unexplored feene ; and her fecret paths of wonder will 
purfued with an ardour and folicitude of inveftigation, which the public attend 0 
paid to thefe obfervations fo juftly infpires. 
I 
