SCIENTIFIC MEMOIRS. 
VOL. II.—PART XI. 
ARTICLE XIII. continued. 
On numerous Animals of the Chaik Formation which are still 
to be found in a living state. By Dr. C. G. ExrenBERG*. 
VIII. Latest additions to our knowledge of the forms of Recent 
; Animals from the Chalk. 
[From the 29th of June, 27th July, and 13th August, 1840 }.] 
RECENT animals of the chalk marl have been found not only 
in the sea-water near Kiel and Cuxhaven, but likewise, as 
stated in my communications of the 29th June, very numerously 
in the sea-mud of Christiania in Norway, where no chalk rocks 
occur in the vicinity, and from whence M. Boeck has had the 
kindness to forward such sea sediment to Berlin. Besides very 
numerous specimens of Dictyocha Speculum, there were also in 
it very many of Dictyocha Fibula, a form which likewise had 
hitherto only occurred fossil in the chalk marls. At the same 
time there were also shells of Coscinodiscus radiatus of the Si- 
cilian chalk, together with Navicula viridula, and Synedra Gal- 
honii, which two latter species belong to the present world, and 
have never yet been observed as constituting the chalk{. Be- 
sides these, there were also some hitherto undescribed sea Infu- 
soria, which have been named Navicula Entomon, a form con- 
stricted in the centre, N. Folium, N. norwegica, and N. quadri- 
Jasciata. Of especial interest also were two still living stellate 
* From the Transactions of the Royal Academy of Berlin for 1840. Pub- 
lished also separately in folio by Voss, of Leipzig. 
+ Monthly Reports of the Academy. 
t Navicula viridula has, however, quite recently been likewise discovered 
by me in Greek mars, characterized by polythalamic calcareous-shelled ani- 
| tan as belonging to the chalk formation, which probably come from 
na. 
VOL. III. PART XI. PAG 
