C 400 ] 
nites. Nature bears an Analogy through all her 
Works; and though all the Species of any one Ge- 
nus is not known to any fMan, yet that Analogy 
ncverthelefs capacitates us to judge of thofe undif- 
cover'd by thofe we know. Thus we find of the 
Echinus Kind, all the Species now known are ever 
found near the Shores; confequently, are not rub- 
ied to be eternally hidden from us ; as is undoubtedly 
the Cafe of the Cornua Ammonis , and Conch & 
anomice . They are no pelagian Shells, as thofe are ; 
Bays and Harbours are the Places where they are 
fifh'd ; their Strudure even evinces the Reafons for it. 
We may therefore with Probability conclude, that 
all the Echinus Kind are of the fame Nature, and 
have the fame W ay of living ; that they only inha- 
bit fuch Places, and that none are pelagian Shells; 
confequently might have been difcover'd. 
I am fenfible there are fome Species of follil 
Echini 5 as, the moft common conoid or pile at ed 
Echini , the common Echini gale at the Echini cly* 
peati y and fome Kinds of the Echini ovariiy &c. 
which tho' we are certain that they have been ma» 
rine Shells, yet thofe particular Species are not 
known in the Sea : But then feverai other Species 
of that fame Genus are. The Cafe of this is quire 
different, fince not one Angle Species of fuch a 
Genus has ever been found. 
The exceffive Bignefs and Thicknefs of Numbers 
of Belemnites defcribed by Authors, viz. of near 
two Feet in Length, and above two Inches in Dia- 
meter in the thickeft Part, others of three Feet long, 
and others as thick and long as a Man's Arm 5 not to 
enumerate thofe o$ly under a Foot Length, and of 
proportionable 
