362 PROF. EHRENBERG ON ANIMALS OF THE CHALK 
42. Gallionella sulcata, Pl. VII. fig. 5. Syn. G. suleata, Infusions- 
thierchen, 1838. 
Recent near Cuxhaven; fossil in the chalk marls of Caltanisetta, 
Oran, Zante, and Greece. 
43. Grammatophora africana. Syn. Navicula africana, 1838. G. ba~ 
cillis a dorso quadratis aut oblongis, a latere navicularibus obtusis, 
plicis internis in quovis dimidio latere tribus undulatis. 
Fossil near Oran in chalk marl; recent near the island Tjorn, and 
near Heligoland in the North Sea. Length 735 — zy". 
44. Grammatophora angulosa. G. bacillis a dorso quadratis aut ob- 
longis a latere navicularibus obtusis, plicis internis in quovis dimidiv 
latere singulis acute angulosis. 
Fossil in the chalk marl of Oran; recent near Tjorn, Length of 
fossil 71,'", of recent zI5!"’. 
45. Grammatophora mexicana. G. bacillis a dorso quadrangulis, a 
latere linearibus apicibus subito constrictis obtusis, plicis internis in 
quovis dimidio latere mediis rectis prope apicem demum uncinatis. 
Among Conferve near Vera Cruz. Length ),'". 
46. Grammatophora oceanica. Syn. Bacillaria adriatica, Lobarzewski. 
G. bacillis a dorso quadrangulis, a latere navicularibus aut linearibus 
apicibus paullatim decrescentibus obtusis, plicis internis in quovis 
dimidio latere mediis rectis prope apicem demum uncinatis. 
Fossil in the chalk marl of Oran; recent near Callao in Peru, 
near Vera Cruz in Mexico, near Tjérn in the Cattegat, near Wismar 
in the Baltic, and in the Mediterranean. Length of fossil 3,'", of 
recent 7$3 — gy”. 
47. Grammatophora undulata. G.bacillis a dorso quadrangulis, a_ 
latere linearibus undulatis quater constrictis obtusis, plicis internis 
in quovis dimidio latere duabus undulatis. j 
Fossil in the chalk marls of Greece; recent among Confervee 
near Vera Cruz. Length 7,!". 
48. Haliomma? radians. H. articulis exterius non discretis, forma 
globosa et subovata foraminosa silicea, cellulis undique e nucleo 
medio obscuro radiantibus. 
Fossil in the Greek chalk marls; recent near Cuxhaven. Di- 
ameter 34!"’, 
49. Lithodesmium undulatum, P\. VIII. fig. 13. L. corpusculis con 
catenatis continuis maxime pellucidis levibus, lateribus duobus un- 
dulatis, tertio plano ejusque margine bis exciso, angulis obtusis. 
Recent near Cuxhaven. Length 4". 
50. Navicula (Pinnularia) Didymus. N. testula striata a latere linear 
integra utrinque truncata, a dorso media constricta utroque fine 
