376 PROF. EHRENBERG ON ANIMALS OF THE CHALK. — 
forms in the young state a manifoldly divided mass, which is probably 
similar to that of fig. 12 a, and of fig. 1 d. 
Fig. 9. Tricerativm striolatum, from Cuxhaven. 
a. Dorsal or ventral surface. 
b. Half reverted from the side. 
ce. Side surface of the same. 
The brownish-yellow ovarium presents itself everywhere divided into 
numerous parts. 
Fig. 10. Triceratium Favus, likewise from Cuxhayen. 
a. Side view. 
6. Ventral or dorsal surface. 
Fig. 11. Zygoceros Rhombus, from Cuxhaven. 
a. Side surface. 
b. Dorsal or ventral surface. 
Fig. 12. Zygoceros Surirella, occurring with the previous species. 
a. Side view. 
b. Dorsal or ventral surface. 
The still young state of the ovarium is apparent in this form in its 
natural expanded state. 
Fig. 13. Lithodesmium undulatum, from Cuxhaven. 
a. A chain-bar of four individuals, seen from the broad basal side 
slightly reverted, in which the two incisions at the lateral margin 
are most distinct ; they probably lead to apertures. 
b. Two chain-joints seen from above, where the striping and in- 
dentation of the two upper surfaces are evident. The green ovarium 
is in both, although agglomerated, yet still swelled. 
c. A side view of a single individual. 
Fig. 14. Dinophysis acuta, from Kiel, a probably phosphorescent 
sea animalcule, seen from the side, characteristic from the circle of cilia 
situated close to the flat front in a groove and by the lateral frill. The 
cilia could not be so distinctly seen that they could be represented, but 
their vibratory action was evident, as in the Peridinii. 
Fig. 15. Dinophysis Michaélis (not limbata), likewise observed and 
drawn in Kiel. 
Fig. 16. Dictyocha Fibula, after one of several specimens which 
have been observed in Berlin with many other recent and living Infu- 
soria in the sea-water from Christiania. It is evidently the same 
creature which occurs so frequently in the chalk marl of Caltanisetta. 
