135 
shorter than the others, but not more 
robust, with a curve in the basal part 
and then parallel. Spores unknown. 
Beslægtet med C. bottnicum Cleve, 
men adskilt ved de svagt indsnørede 
Foramina. 
7. C. delicatulum nm. sp. Fig.4. Chætoceras 
caspicum Ostf. 
Chains straight. Cell in a front É… 5/0eller 4 Fromtatilling. 
view rectangular, often longer than wide =D REE. 
(12—20 u long, 7—8 u wide), in a Br eks 
side view circular - elliptic. 
Valves concave; foramina 
circular -elliptic.…. Hoop at 
least "3 of the length of 
the cell. Chromaitophore 1, 
in front. Awns delicate, 
very long, issuing from the 
angles of the cell and cros- 
sing one another at the 
insertion; terminal awns 
similar to the others, diver- 
Jing at an obtuse angle. Fig.5. Chætoceras delicatulum Ostf. 
Kæde i Frontstilling med Kromatoforer. 
Spores unknown. raser lt deg Lommer ledt rart 
8. C. Paulsenii n. sp. 
Chains straight, stiff, multicellular. — Cell in a front view 
rectangular with sharp angles, in a side view circular-elliptic, 
longer than wide (7—17 4 long, 5—7 pm wide). Valves flat: fora- 
mina absent. Hoop cylindrical , at least Yz of the length of the 
cell. Chromatophore 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 
aæis; terminal awns similar to the others. Spores unknown. 
