Description of Neiu Protozoa. 
29 
of the animal were completed, the young Lagotia had in- 
creased in size, and its tube had become more opaque. 
The spiral structure of the tube appears to afford a provision 
for its growth similar to that found in the articulated shell of 
the Echinus. In Lagotia producta, increase in length of the 
tube would be effected by the deposition of chitine on both 
edges of the spiral ribbon, while increase in its calibre would 
take place by the gradual unrolling of the same. The chi- 
tine is probably secreted by the thick inner coat of the tube ; 
while the external coat appears to act, like the " colletoderm " 
of zoophytes, as a cement for attaching the cell to the rocks. 
These young Protozoa frequently assembled in clusters, and 
secreted a quantity of " colletoderm," which glued all their 
cells into a single mass. 
So far, the observation as to the reproduction of Lagotia is 
in some measure satisfactory ; but it still remains to be dis- 
covered how the ciliated larvse are produced. In Epistylis 
nutans^ one of the Vorticellina to which Lagotia is allied, an 
encysting process takes place, according to Stein, by which 
the animal takes the form of an Acineta. The ciliated head 
is absorbed ; the body is inclosed in a tough tunic ; and nu- 
merous long capitate tentacles are put forth, which have the 
property of sucking tubes, and quickly absorb the fluid con- 
tents of any animalcule coming in contact with them. Within 
this Acineta body one or more ciliated embryos are formed, 
and successively given off, until the substance of the Acineta 
is entirely exhausted, and it becomes an empty sac. A similar 
transformation into the Acineta state has been noticed in Va- 
ginicola, a still nearer ally of Lagotia. I have, however, not 
been able to detect any such change in the subject of this notice. 
2. Zooteirea religata. (Fig. 7.) 
This Protozoan is an inhabitant of deep water, and was 
dredged from the oyster-beds opposite to Newhaven. It was 
attached in considerable numbers to the concavity of the lower 
valve of an old oyster-shell, from whence it propagated itself 
to the sea-weeds of the vessel in which it was confined. 
Zooteirea may be briefly described as an Actinophrys mounted 
