How do crinoids use mucus nets to catch food?

Crinoids are suspension feeders that capture food by spreading their arms into a fan-like shape at right angles to the prevailing water current.1

The tube feet of crinoids are arranged in clumps of three along their arms and feathery projections called pinnules. These tube feet secrete and spread a net of sticky mucus that traps small planktonic organisms. Once the prey is captured, the food particles are moved toward the mouth along open grooves on the tentacles or arms, facilitated by the combined activity of the tube feet and minute, hairlike projections known as cilia.231