526 



GENERAL BIOLOGY 



FIG. 285. Plancton Entomostraca. a, Daphnia; b, Chydorus; c, Simocephalus; 

 d, Bosmina; e^ Cyclops; /, Diaptomus; g, Canthocamptus; h, A nauplius 

 (larva) of Cyclops. Antenna of male is shown detached at right in e and /, 

 while the figure is of a female bearing egg sacs. 



METAZOA Statoblasts of fresh water sponges (see fig. 189 on 

 p. 336) and bryozoans (see fig. 188 on p. 335.) 



Crustaceans of the order Entomostraca (see fig. 

 285 above). 



Rotifers (see fig. 220, z on p. 377, and fig. 286 

 below.) 



water mites, hydras, etc., more rarely occurring. 



larvse of insects (see fig. 239 on p. 409.) 



Study 440,. An examination of lake plane ton. 



Materials needed : A collection of liv- 

 ing plancton, freshly obtained from some 

 nearby lake or pond. This will be easily 

 gathered by such methods as are sug- 

 gested on page 521. 



Directions: Mount a drop at a time 

 of the concentrated plancton on a slide, 

 and examine with the microscope, using 



FIG. 286. Plancton Roti- the ^^ above referred to identify 

 *. Phiiodma; j, the animals and plants found in it. 



Synchaeta; k, Polyar- 

 thra, I, Anurea. 



When in doubt, ask the instructors. 



