Dr. H. Fol on the Family 'Tintinnodea. 77 
This layer surrounds a rounded cavity 28 yw in diameter, filled 
chiefly with a granular matter; we distinguish in it compa- 
ratively large granules, which acquire a very dark brown 
colour and are enclosed in an irregular finely punctate mass. 
I have not met with this structure in the nuclei of the other 
species ; but I do not for that reason assert that it is a specific 
character; I should rather incline to think that this state of 
the nucleus answers to one of the phases of the existence of 
our animals. I yregret much that I did not this time meet 
with conjugated individuals; suitably prepared they would 
have furnished valuable information as to the function of the 
nuclei during that act. 
The sarcode of the body appears to be simply granular, 
without organization ; and, in particular, I have sought in vain 
for indications of striation or of layers of myoplasm*. 
The oral disk and its singular structure particularly at- 
tracted my attention this time also; and by means of perfect 
preparations as regards fixation and preservation I have been 
able to examine the vibratile circlet at my leisure and under 
the highest powers. The results obtained differ considerably 
from those which were furnished by the laborious observation 
of living animals. 
=) . . . . . 
The general arrangement of the vibratile lines is indeed as 
I indicated ; they are curved lines, about twenty in number, 
which start from the margin and terminate in the interior of 
the circle. But these lines are only in part formed by isolated 
cilia; the outer portion of each vibratile line is composed 
of pretty broad vibratile lamelle. These lamelle are slashed 
at the free margin and divided into filaments ; they undulate 
in the living animal in such a manner as to give exactly the 
same image as arow of cilia beating one after the other. This 
appearance, together with the existence of isolated cilia de- 
tached from the margin of the lamelle, led me into an error, 
but an error the more excusable because the lamellae occupy 
only the margin of the disk, and a series of gradually 
shortening cilia exists upon the line of each palette. 
These undulating palettes acquired such distinct contours 
in perchloride of iron and gallic acid, that without the obser- 
vation of the living animal one would think one had to do 
with cuticular products (Pl. LV. fig. 7). The width of the 
palettes, moreover, is very variable, according to the genera 
* In speaking of the absence of striation in the peduncle of the body, 
a striation which, on the contrary, appears in the peduncle of the Vorti- 
celle, 1 have used the term ‘transverse striation.” This is a dapsus - 
calami which Biitschli has justly pointed out (XV. p. 151); it wasof the 
longitudinal striation that [ intended to speak. 
