( 3SO 
heads helps them to lift up their head and fore*part; Great 
diverfity there is of fwimming bladders in refpeft of figure, 
fubftance, fituation and connexion in feveral Fiflies ; But not 
being able to give you any reafonable account of each , I ftali 
forbear to add any thing further of them. 
SIR, 
Tour very humble Servant 
22. I67S. 
John Ray. 
