Description of New Protozoa, 
31 
its anatomical structure is protozoan, it can be classed in no 
described family of Protozoa. It consists of three parts : Ist^ 
An oblong cushion of opaque granular sarcode (fig. 8, a) 
attached to the corallum of the zoophyte, and sometimes con- 
taining a few vesicules. 2<i, A long column attached to the 
cushion (&), bearing a brush of short tentacles. This column 
consists of two tissues ; an outer coat thrown into numerous 
. transverse folds or wrinkles (fig. 9, a), and an inner core dis- 
playing a faintly-marked longitudinal structure (h). At the 
top of the column this inner coat appears to terminate in a 
brush, or rather mop of from ten to more than forty tentacles 
(c), which have occasionally a slow and rather irregular 
waving motion, though they are generally at rest. 3(i, 
There exists, but not invariably, a long, spindle-shaped, and 
rather curved process of a granular tissue, similar to that of 
the cushion (fig. 8, c), also attached by one extremity to the 
upper surface of that body, and having at its unattached ex- 
tremity a clear space^ which opens externally by a small oral 
aperture. This body is often absent, and I have seen it at- 
tached alone to the Sertularia. I am therefore inclined to con- 
sider it either a gemma or a parasite belonging to Gregarinse. 
Although Corethria bears no resemblance in form to any known 
Protozoan, it has anatomically all the elemental tissues of an 
Actinophrys. Let us suppose an Actinophrys in which the 
ectosarc or prehensile tissue is segregated from the endosarc 
or nutritive tissue, the former, instead of forming a multitude 
of palpocils, being gathered together into a single large 
tentacle, surrounded in greater part by a wrinkled cuticle, and 
undergoing division at its summit into a number of palpocils. 
Such a structure I have observed in the compound palpocils 
situated on the tentacles, at the extremities of tlie rays of 
Solaster papposa, and such appears to be the structure of 
the " mop" of Corethria. Food taken by the palpocils Avould 
be transferred through the soft sarcode composing the centre 
of the pillar, and digested by the granular endosarc of the 
cushion below. I have seen the spores of Algae thus absorbed 
into and pass through the tentacles of Eplielota apiculosa. 
A like observation has been recorded with regard to the ten- 
tacles of an Acineta. From zo^n^^ov, a mop. 
