left-wound. Parasitic.

c. Adoral zone a left-wound spiral. Family _Vorticellidæ_
Attached or unattached forms.

* Presence at Woods Hole indicated by asterisk.


Genus LICHNOPHORA Claparède '67.

(Gruber '84; Fabre-Domergue '88; Bütschli '88; Wallengren '94;
Stevens 1901.)

Small or medium-sized colorless animals, extremely elastic and
flexible. The anterior part, bearing the adoral zone, is round or
oval in ventral view, and has a flat ventral and a highly arched
dorsal surface. The posterior end of the animal is reduced to a
stalk-like structure which is broadened at the extremity to form
a sucking disk. The surface of this disk and the surface of the
peristome may be brought into the same plane by the characteristic
bending of the stalk portion. A ciliated girdle is placed at the
edge of the sucking disk. A well-developed adoral zone incloses the
peristome; it begins at the mouth on the left side and includes
nearly all of the peristome in its left-wound spiral, the extremity
approaching closely the end near the mouth. The macronucleus is a
long-beaded structure, or it may be in several parts connected by
strands (Gruber). The contractile vacuole is on the left side in the
region of the mouth. Salt water.