CLASSIFICATION OF CTENOPHORES. 



95 



Order 2. Saecatas. — Body more or less spherical, with two long tenta- 

 cles capable of being wholly retracted in a sac (Pleuro. 

 brachia). 



Order 3. Taniaia. — Body ribbon-like, being very much compressed in 

 the direction of the lateral diameter (Cestum). 



Order 4. Lobatce. — Body lateral, compressed, bUobed (Bolina). 



View of the Classification of the Ctenophoba. 



Lobata. 

 (Boliua.) 



Tcmiata, 

 ^Cestum.) 



Saccata. 

 (PleurobracMa.) 



Euri/stomem. 

 atiyia.) 



Ctenophoka. 



Laboratory Worh. — The Ctenophorse should be studied while alive. 

 They may be collected with a drag or tow-net from a boat when the 

 surface of the ocean is calm. For studying the fine anatomy and 

 tissues they should be treated by the same methods as the smaller jeUy- 

 fishes. 



