its gill pores. Harrimania planktophilus is dioecious, with individuals being either male or female. The yellow eggs are deposited in a hollow, cylindrical, jellylike mass in the burrow. Adults can pass through the centre of this. The outer side of the mass is coated in debris while the inner side is clean. When the larvae hatch, they pass through a number of ciliated, spherical and hemispherical developmental stages before becoming vermiform juveniles and developing the proboscis, collar and trunk of the adult. The juveniles can travel forward and backwards by beating their cilia, moving as far as a body length in two seconds. References Enteropneusta Animals described in 2002