COELENTERATA 75 
eight cords of fatty cells attached to the oesophagus in both 
kinds of polyps. 
Ciass C. CTENOPHORA. 
CHARACTERISTICS.— Pelagic Coelenterata, usually spheroidal, more 
rarely band-shaped in form. Hight meridional rows of 
vibrating plates composed of fused cilia form the locomotor 
apparatus. A large parr of retractile tentacles are usually 
present, which can be withdrawn «into pouches. At the 
aboral pole is a special sense organ. They are all herma- 
phrodite, and pelagic. 
This group of animals possesses considerable importance 
from a phylogenetic point of view. Haeckel has described a 
Fic, 55.—Hormiphora plumosa. After 
Chun. Side view. 
1. Mouth leading into stomach. 
2. Aboral pole with sense organ. 
3. Funnel. 
4. Recurrent canals running back to- 
wards oral pole. 
5. One of the eight bands of fused cilia. 
6. One of the eight canals running to- 
wards 5. 
. A tentacular pouch. 
Ty 
. A tentacle. 
co OO 
. Gelatinous tissue. 
remarkable Anthomedusan named Ctenaria ctenophora which 
has many of the characteristic features of a Ctenophor; whilst 
