234 MARINE INVERTEBRATES 
Class 
CRINOIDEA 
Genera 
Pentacrinus 
Comatula 
CLASS CRINOIDEA 
FEATHER-STARS AND SEA-LILIES 
The crinoids are inhabitants of deep water, where they grow 
in great numbers, forming beds of sea-lilies. Their general 
form, which suggests the lily, and their feather-like manner of 
branching, give them the two common names of sea-lilies and 
sea-feathers. They have a long, jointed stalk, one end of which 
is attached, while the other bears the disk of the animal. From 
the disk emanate five arms, which divide near the base, making 
The feather-star (Antedon), illustrating the Comatula form of crinoid, 
