* Presence at Woods Hole indicated by asterisk.


Genus TINTINNOPSIS Stein '67.

(Stein '67; Kent '81; Daday '87; Bütschli '88.)

Medium-sized ciliates, inclosed in a chitinous lorica with embedded
sand crystals. The form of the house, or lorica, varies greatly.
In some cases the mouth opening is wide, giving the lorica a bell
form; it may be long and tubular, short and spherical, or variously
indented. The animal is attached, as in the closely allied genus
_Tintinnus_, by a peduncle to the bottom of the lorica. The anterior
end of the animal is inclosed by two complete circles of cilia;
one, the outer, forming the adoral zone, is composed of thick
tentacle-like membranelles, the other consists of shorter cilia
within the adoral zone. The mouth leads into a curved oesophagus
containing rows of downward-directed cilia (Daday). The entire body
is covered with cilia, but as the lorica is always opaque these can
be made out only when the animal is induced to leave the house. The
only difference between this genus and _Tintinnus_ is the covering
of foreign bodies--usually sand crystals. Movement is rapid and
restless, and peculiarly vibratory, owing to the apparent awkwardness
in moving the house. Salt water.


Tintinnopsis beroidea Stein, var. plagiostoma Daday. Fig. 47.

Synonym: _Codonella beroidea_ Entz '84.