TABLE SHOWING THE CLASSIFICATION OF THE CTENOPHORA 
DESCRIBED IN THIS CHAPTER 
Orders 
CYDIPPIDA 
(Two tentacles, retractile into 
sheaths) 
LOBATA 
(Numerous lateral tentacles 
contained in a groove; body 
compressed ; two large oral 
lobes) 
CESTIDA 
(Ribbon-like form, from body 
being extremely compressed 
in the vertical plane) 
BEROIDA 
(No tentacles; mouth very 
wide ; gullet occupies greater 
part of body) 
Class 
CTENOPHORA 
Genera 
Pleurobrachia 
Mnemiopsis 
Cestum 
Idyia 
154 
Species 
P. rhododaciyla 
B. septentrionalis 
B. vitrea 
M. Leidyit 
[z alata 
C. veneris 
I. roseola 
I. cyanthina 
