STILL FOUND IN A LIVING STATE. 357 
_ cillariorum, ejusque Naviculaceorum sectione, liberum, lorica bivalvi 
rotunda (silicea) in utroque latere tribus processibus appendiculata, 
_ sponte longitudinaliter dividuum. 
Coscinodiscus corniculis seu pedicellis utrinque tribus, et 77ricera- 
 tium rotundum Tripodisci characterem enuntiant. 
Only one large species from the North Sea known, which is repre~ 
sented on Plate VII. 
X. Zycoceros.—Char. gen. Animal polygastricum e Bacillariorum 
familia et Naviculaceorum sectione, liberum, lorica bivalvi, com- 
pressa, naviculari (silicea), utrinque corniculis duobus perforatis in- 
signi, sponte longitudinaliter perfecte dividuum. 
_ Biddulphiam liberam, perfecte sponte dividuam, hine nunquam 
_ concatenatam nec affixam equat. 
Both known species inhabit the North Sea, and are figured on 
_ Plate VIII. 
B. New Fossil Species of known Genera, and now for the first time 
observed Living. 
“f 
vi a, CALCAREOUS-SHELLED PoLYTHALAMIA. 
1. Geoponus Stella borealis, n. sp. Pl. V. fig. a-g. G. Testule (com- 
_ posite ) superficie non striata, leevi, foeananihis minimis subtiliter 
- punctata, animalculis (et aperturis frontalibus) aucto sensim nu- 
"mero, vicenis. 
In the North Sea near Cuxhaven, and in the canal of Christiania. 
Size of the shells 3, — 1". 
2. Nonionina germanica, n. sp. Pl. VI. fig. 1. a-g. N. Testule (sim- 
plicis) superficie non striata, levi, foraminibus minimis subtiliter punc- 
‘tata, animalculi (unici) apertura sinistra (unica) parva. 
z. North Sea, on the German coast near Cuxhaven. Size of shell 
7 ii, 
3. Planulina ocellata. Syn. Rotalia ocellata, 1838. 
Recent near Cuxhaven; fossil in the chalk near Caltanisetta in 
; Sicily. 
4. Rotalia globulosa, Pl. VI. fig. 3. Syn. Rotalia globulosa, 1838. 
Recent near Cuxhaven in the North Sea; fossil very numerous 
in the white chalk of Russia (Wolsk), Poland, Prussia, Denmark, 
England, France, and Sicily ; in the chalk marls of Greece, Zante, 
Sicily, and Oran; likewise in the compact chalk of Egypt and 
Arabia. 
5. Rotalia Stigma, Pl. VI. fig. 2. Syn. Rotalia PUA bs 1838. 
Recent near Cuxhaven; fossil in the white chalk of Cattolica in 
Sicily and in the chalk marls of Caltanisetta. 
