STILL FOUND IN A LIVING STATE. 373 
Fig. 3. Coscinodiscus patina, a form occurring more rarely in the 
chalk marls and polishing slates of the chalk, recent near Cuxhaven. 
a, 6, ce. Dises of various sizes, seen from the broad surface. In 
: fig. b the coloured brownish-yellow ovarium is evident. 
ce. The form 6 seen from its narrow surface, in which it is evident 
that it was an animal in the act of longitudinal division, and that two 
ovaria are situated behind each other. 
d. The same, half reverted, in outline. 
e. A smaller disc. 
f. Young healthy state of the same animal, with fully developed 
ovarium as yellow numerous globules, then at ¢ with a glandular 
body which may be compared to the male sexual gland, and at v 
with a large contractile vesicle in the interior. 
g. The same, from its narrow side- 
h. The same, half reverted, in outline. 
Fig. 4. Coscinodiscus lineatus, living with the former, and occurring 
frequently fossil. 
a. Empty shells, with their characteristic straight-lined arrange- 
ment of cells. 
6. Narrow surlace of the same, in the act of spontaneous division, 
consequently double animalcule. 
d. Half reverted double animalcule. These three with their yel- 
low ovarium quite similar to that of the Gallionelle. 
e. Narrow surface of another individual preparing to divide, with 
green contracted ovarium. 
Fig. 5. Gallionella sulcata, already figured as fossil form of the chalk 
marl of Oran in my large work on Infusoria, but here represented as 
living from Cuxhaven. 
a. An eleven-jointed chain of as many animalcules, of which seve- 
ral are filled with the ovarium of brownish yellow colour, some are 
_ empty. 
6. A single animalcule from the broad side. 
ce. The same, half reverted. 
d. Another chain of 74 joints, with contracted ovarium of greenish 
colour. 
e. The broad lateral surface. 
Fig. 6. Tripodiscus germanicus, a recent form from Cuxhaven, not 
known in the fossil state, which belongs to a peculiar genus. 
a. Half reverted side view. 
6. Broad lateral surface with three bright spots. 
e. Narrow ventral surface. 
In the interior of all the figures the ovarium is evident as a green 
mass. 
The horns, three on each side, and evident in all, constitute the 
generic character, and connect this round form very closely with the 
apparently much deviating trilateral Triceratium of the following Plate. 
PLATE VIII. 
Sixteen forms of siliceous-shelled Infusoria from the Baltic and North 
Sea are here represented, of which four are perfectly identical with 
those met with generally in vast numbers in the chalk marls. These 
