MOLLUSCOIDA 189 
Genera Species 
Suborder m7 Esau 
Peey - hirsutum 
CTENOSTOMATA Alcyonidium + “4" nisnidum 
(Horny or gelatinous zocecia, having pe shi 
tooth-like processes which close the A. parasiticum 
apertures when the tentacles are - ‘ V. dichotoma 
Vesicularia 
retracted) V. custata 
Subclass 
Entoprocta 
(Excretory opening within lophophore ; mouth near margin of area, which is surrounded by 
tentacles ; tentacles roll up instead of being retracted) 
Pedicellina P. americana 
