86 Dr. H. Fol on the Family Tintinnodea. 
in any species of Tintinnodea, met with smaller and larger 
tests, which proves that the test is produced of its definitive 
dimensions from the first, whatever may be the size of the 
animal secreting it. 
The T¢ntinnus Khrenbergit described by Claparéde (X. p. 1) 
indeed appears to continue to enlarge its test after having 
secreted it; but this growth is obtained by the addition of 
rings, which are not in continuity of form with the first por- 
tion of the test. 
Codonella galea, Hiick. (Pl. IV. fig. 14.) 
Although the form and the mode of incrustation of the test 
do not absolutely agree with Hiickel’s figures, I think I may 
identify this species with that of the author cited, and this for 
reasons already indicated in connexion with Codonella cam- 
panula. 
The test is strongly incrusted with large flattened granules, 
which nearly all touch each other at their edges. The total 
length of the test is 0°08 millim., its greatest width is 0:06 
millim.; its entrance at the level of the constriction may be 
closed when the animal retracts itself by a folded membrane, 
which I have indicated in the figure. ‘The folds meet in such 
a manner that the central point forms a pointed projection. 
I abstain from classing and giving a name to the Infuso- 
rian which I have found attached to the alge (Pl. IV. fig. 15), 
the observation of the living animal not having furnished me 
with sufficient information as to the structure of the vibratile 
circlet and of the test, and the specimens which I had preserved 
for examination having been destroyed by an accident. It 
seems probable, however, that this form is allied to the Codo- 
nelle. In most of the specimens that I have met with the 
apex of the test was broken, so that the test was open at both 
ends ; but this injury does not seem to be the least incon- 
venience to the animal. 
It results from the facts that I have just cited that the 
organization of the Tintinnodea is not much varied, and that 
nothing can justify the separation of the genera at present 
known into several families. I have previously indicated 
what are my motives for retaining the above name for the 
whole family. Sterki’s memoir is particularly interesting as 
showing us that the freshwater forms do not differ in their 
organization from the marine forms, and that there is no 
