b. Thecate forms; the body is Family _Tintinnidæ_
attached by a stalk to the cup;
within the adoral zone is a ring
of cilia.
c. The peristomial depression is Family _Ophryoscolecidæ_
deep and funnel-like; cuticle
thick, with posterior spine-like
processes.
* Presence at Woods Hole indicated by asterisk.