45^ 



Microscopical Essays. 



then another arm performs the fame ; thus by the continual mo- 

 tion of it's arms, it puts the water into violent agitation, and 

 brings into it's mouth the food whereby it is nourifhed. 



In the infide of thefe animals a fmall oblong whitifh body is 

 formed, which is carried to the outfide, and remains fixed in a 

 perpendicular direction to the body ; many of thefe are formed 

 daily, and of thefe oval bodies new animals are produced, exactly 

 fimilar to the parent. 



If thefe minute bodies are eggs, they are of a lingular kind y . 

 being deftitute of any covering, and are neither membranaceous 

 nor cruftaceous ; we cannot with propriety fay the young ones 

 are hatched from them ; we can, however, perceive thefe oviform 

 bodies to gradually unfold themfelves. The developement is 

 accomplilhed in a few minutes, and an animalculum appears like 

 the parent, 



Mr. Trembley amaffed a large quantity of thefe eggs, and car- 

 ried them from England with him, keeping them quite dry ; 

 on putting them into water, they gradually developed, and be- 

 came as perfect as the tubularia from which they proceeded. 



There is a very great fimilarity in the conftruciion of this little 

 creature, and many of the marine polypes, who, like it, ex id in 

 tubes of the fame growth with themfelves, 



Fig. 32 reprefents three tubularia? campanulata?, or plumed 

 polypes, very much magnified, namely, bfacddehgi, which 

 is out of it's cell ; I B A C, which is within it's cell, and the young 



