with great celerity either the one way or the - other, as 

 the creature pleafes to direct its flexions, and in a regu- 

 lar accelerated fucceffion from the top to the margin. 

 It is impoffible to exprefs the livelinefs of the motions 

 of thefe delicate organs, or the beautiful variety of 

 colours that rife from them while they play to and fro 

 in the rays of* the fun ; nor is it eafy to exprefs the 

 fpeed and regularity with which the motions fucceed 

 each other from one end of the rays to the other." 



Thefe animals are frequently feen about the weftern 

 iflands of Jamaica : they feldom exceed three inches 

 and a half in length, or two and a half in the largeft 

 tranfverfe diameter. 



