Of the Polype'i Body. 27 



jextends with the Body of the Polype, Some 

 Sorts of Polypes are diflinguilhable by the 

 Length of this Tail-Part, which in them is 

 much flenderer and clearer than the reft of 

 the Body : and it is remarkable, that thefe 

 long-taild Polypes have commonly long 

 Horns alfo. The Polypes found at Hackney^ 

 and given me by Mr. Ellicot, have this 

 Length of Tail, and fo have the long-arm*d 

 Sort you lately received from Mr. Trem- 

 ble y, with fome of which you was io kind 

 to oblige me. Through the Middle of this 

 long Tail a Gut is very plainly diftinguifli- 

 able by the Microfcope, (which cannot fo 

 eafily be perceived in the fliorter ones) paf- 

 fing from the Stomach to an Opening at its 

 Extremity, which I fhall call the Anus : fince 

 I have, feveral times, ken the Dung of the 

 Polype in little round Pellets difcharged at this 

 Outlet or Anus. 



Much the greater andgrofler Part of what 

 the Polype eats, is moft certainly thrown out 

 again by the Mouth, after lying a proper 

 Time to become digefted in the Stomach : 

 and, for a good while, I imagined there was 

 no other Evacuation ; but am now convin- 

 ced, that the finer Part, in fmall Quantity, 

 is carried downwards through the Tail, and 

 paffed oft that Way. I believe, however, 

 there is alfo another Purpofe to which this 

 Paffage ferves, and that is, to convey a ikfe- 

 i:us or llimy Matter to the End of the Tail, 



for 



