Of the Polype 'i Anm.'^- 35 



are not however produced all at one Time, 

 nor are always of the fame Length one as 

 another. Such Polypes^ for Inftance, as have 

 8 Arms when full grown, ufually put forth 

 only 2 at fir ft, dired:ly oppofite to one ano- 

 ther: in fome Hours 2 more appear, exadly 

 between thefe: and ihortly after 4 younger 

 Ones rife out between the other 4, So that 

 till the laft attain their full Growth, which 

 requires about a Week, they are fhorter than 

 the reft; and, indeed, it is difficult to know 

 whether they are at laft all naturally of the 

 fame Length, fince they are often broken by 

 Accident ^ and if not, their odd Contradli- 

 ons and Extenfions may deceive all our Ob- 

 fervations in this refpedl, as they often con- 

 trad: fome of their Arms at the Inftant they 

 are extending others -f-. 



The general Form of a Polype's Arm, 

 when the Creature feems quiet and moft at 

 Eafe, bears fo near a Refsmblance to the 

 Arm of a Star-Fi(h, that by examining the 

 latter, we may form a reafonable Conjedure 

 of many particulars in the former, which 

 by its Smallnefs we are uncapable of difcern- 

 ing perfeftly. The Arm of a Polype is flat 

 on one fide, fome what circular on the other. 



\ One fhall fee fometimes a divided or double Arm, or an 

 Arm growing from the Side of another Arms but this muft 

 be regarded as a mere Lufus Natur<:e, 



D 2 and 



