OLASSni'ICATION' OF CTEN0PH0RE8. 



95 



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

 cles capable of being wholly retracted in a sac (Tleuro- 

 brachia). 



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

 the direction of the lateral diameter (Cestum). 



Order 4. Lobatm. — Body lateral, compressed, bilobed (Bolina). 



View op the Classification of the Ctenophoba. 



Ldbata. 

 (Boiina.) 



Tmniata. 

 (Cestum.) 



Saecata. 

 (Pleurobrachia.) 



MirystoTnem. 



Ctbnophoka. 



Laboratory Work. — 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 jelly- 

 fishes. 



