14 GEOLOGICAL MEMOIRS. 
The most remarkable Cephalopoda are Goniatites crenistria, 
Phil., G. mivolobus, Phil., Orthoceras scalare, Goldf., and O. strio- 
latum, v. Mey., which occur in Hesse, Nassau, Westphalia, the Harz, 
Belgium, England, and Ireland, and thus serve as a strong paleon- 
tological proof of the contemporaneity of the two types of the infe- 
rior Carboniferous formation, the Culm and the Mountain-Limestone, 
The first and third of these species have likewise been met with in 
the Culm of Moravia. The presence of Orthoceras giganteum, Sow. 
(a form with a large subcylindrical shell and a broad slightly ex- 
centric siphon, spherically inflated in each chamber), has been clearly 
ascertained; this species has hitherto been found only in the typical 
Carboniferous Limestone of Belgium, England, and Ireland; its oc- 
rence in Lower Silesia is rare. Some forms related to Cyrtoceras 
Gesnert (a Belgian and English species) occur; and F, Romer has 
described specimens of Nautilus bilobatus, Sow., a species previously 
found only in England and Ireland. 
The Pteropoda are represented by a species of Conularia. Among 
the Heteropoda are Bellerophon tenuifascia, Sow., B. hiulcus, Mart., 
B. Witryanus, Kon., and B. decussatus, Flem. The first of these 
species has been found in the Carboniferous Limestone of Belgium, 
England, Ireland, Ratingen near Diisseldorf, and Tennessee. The 
most abundant Gasteropoda are Huomphalus catillus, Mart., and E. 
Dionysii, Montf., both widely distributed forms, and Cirrus spiralis, 
Phil. Of the same class we have also Chemnitzia Lefebvrei, Leveillé, 
Lnttorina biserialis, Kon., Buccitnum imbricatum, Phil., Plewroto- 
maria canaliculata, M‘Coy, P. virgulata, Kon., Murchisonia Ver- 
newliana, Kon., M. angulosa, Phil., and M. gracilis, Goldf. 
The Lamellibranchiata include a considerable number of new 
forms; they are particularly characterized by the presence of nu- 
merous Pectinide, as in the Irish Carboniferous limestone; next to 
these come a number of forms allied to Cypricardia, and to the 
genus usually known as Sanguinolites. Pecten Phillipsii, Goldf. 
(described by M‘Coy from the Irish Carboniferous limestone under 
the name of P. Sowerby?), is especially abundant. Other species of 
the same group noticed by the author are Pecten Ottones, Goldf., 
P. ellipticus, Phil., P. granulosus, Phil., and P. granosus, Sow. 
Other Lamellibranchiata ‘mentioned are <Avicula lepida, Goldf., 
Nucula clavata, M‘Coy, Pinna spatula, M‘Coy, Corbula senilis, Phil., 
Sanguinolites variabilis, M‘Coy, Cypricardia rhombea, Phil., C. 
semisulcata, Sow., Cardinia subparallela, Portl. (an Irish species 
also obtained by Kaiserling from Petschora-land, and by Dames from 
the Devonian of Kittherg), Arca prisca, Goldf., and Cucullea tenwi- 
stria, M‘Coy. Conocardia are very rare; the author has obtained 
only a few small specimens of the common C. aliforme, Sow. Allc- 
risma sulcatum, Phil., a characteristic species of the Carboniferous 
Limestone of England and Russia is not unfrequent; and A. regulare, 
King, has been detected. Posidonomya. Becheri, Bronn, one of the 
most characteristic fossils of the true Culm in Nassau, Westphalia, 
the Harz, Moravia, and England, was met with only at Rothwalters- 
dorf. 
