I04 



THE OCEAN WORLD. 



Among the forms closely related to this group may be noted the 

 Kondylostoina patens (Fig. 38), remarkable for its size and voracity. 

 It sometimes attains to the size of the twelfth of an inch, and abounds 

 on every shore from, the Mediterranean to the Baltic, living among 

 algae. Another Bursarian, a species called Lumbrici, lives between 



Fig. 38. — Kondylostoma patens (Duj.), magnified 350 times. Fig. 39. — Stentor Muelleri (Ehr). 



the intestines and the external muscular coat of the earth-worm, 

 Lu7nbricns terrestris. 



To the group of Vorticellina belongs the genus Stentor, some 

 species of which are quite perceptible to the naked eye. 



The Stentors are inhabitants of fresh, tranquil water, not subject 

 to agitation, and covered with water plants. They are nearly all 

 coloured green, blackish, or blue ; their bodies are covered with 

 cilia. They are eminently contractile, and very variable in form. 

 Their body is without a stalk, but they can attach themselves 

 temporarily by means of the posterior extremity of their body ; they 



