135 
skorter than tke others, but not more 
robust, with a curve in tke basal part 
and then parallel. Spores unhnown. 
Beslægtet med C. bottnicum Cleve, 
men adskilt ved de svagt indsnørede 
Foramina. 
7. C. delicatulum n. sp. 
Chains straight. Cell in a front 
view rectangular, often longer than wide 
(12—20 a long, 1—8 p wide), in a 
side view circular - elliptic. 
Valves concave ; foramina 
circular-elliptic. Hoop at 
least V 3 of the lengtli of 
the cell. Cliromatophore 1, 
in front. Awns delicate, 
very long, issuing from the 
angles of the cell and Cros¬ 
sing one another at the 
insertion; terminal aivns 
similar to the others, diver- 
ging at an obtuse angle. 
Spores unhnown. 
Fig. 4. Chætoceras 
caspicum Ostf. 
a. 2 Celler i Frontstilling. 
b. Kæde i Fronstilling. 
c- i Sidestilling. 
(a 300 /i; b, c «o/i). 
Fiff. 5. 
o 
Chætoceras delicatulum Ostf. 
Kæde i Frontstilling med Kromatoforer. 
b. uden Kromatoforer. ( 500 /i)- 
8. C. Paulsenii n. sp. 
Chains straight , stiff, multicellular . Cell in a front view 
rectangular with skarp angles, in a side view circular-elliptic, 
longer than wide (7—17 p long, 5—7 p wide). Valves flat; fora¬ 
mina absent. Hoop cylindrical y at least V 3 of the length of the 
cell. Chromatopliore 1, in front. Awns delicate, very long, issuing 
from the angles of the cell and Crossing one another at the insertion, 
then turning off perpendicular to the longitudinal axis of the chain 
in a sigmoid curve and all nearly parallel to the transversal 
axis; terminal awns similar to the others. Spores unhnown. 
