80 
]S AUIILOIDEA. 
some of the Lower Silurian forms referred to 0. (jregarium may 
belong here, but it cannot be said to be proved.” 
Horizon. Bala series. 
Locality. Cynwyd, Merionethshire. 
One imperfect specimen represents this species, presented by J. E. 
Lee, Esq., E.S.A.., E.G.S. 
DEVONIAN SPECIES h 
Orthoceras longicameratum,*Eoord. 
1842. Orthoceratites regularis, var., d’Aichiac & de Verneuil, Trans. 
Geol. Soc. 2nd ser. a'oI. vi. pt. ii. p. o44, pi. xxvii. f. 2. 
1854. Orthoceras gracile, F. A. Iloemer, Palaeontogi’aphica, Band iii. 
p. 16, tab. iii. f. 19. 
1866. Orthoceras regulare, G. & F. Sandberger, Die Verstein. Nassau, 
p. 173, Taf. XX. ff. 2, 2 a-k ; 7iot f. 2 L {Hot of Schlotheiin.) 
[_Not 1840. Orthoceratites reyalaris, Miinster, Beitriige ziir Petrefacten- 
kunde, Heft iii. p. 95, Taf. xvii. ff. 3, 4.] 
Sp. Char. Shell straight. Much elongated. Hate of increase of 
two specimens measured, 1 in 36 and 1 in 41. Body-chamber (?). 
Septa wide apart, distant from 1^ to 2 diameters. Siph uncle 
small, cylindrical, central. Test unknown. 
Remarks. The specimens are all casts of the chambers (some- 
times hollow) in iron-pyrites. Many of them, are strangely dis- 
torted by pressure in the slaty rock in which they are embedded. 
In some instances the cast of each chamber has been pushed obliquely 
a little out of its place, so as to give to the fossil the appearance of 
a vertebral column of a fish. The hollow specimens frequently 
exhibit the siphuncle in the interior when broken open. 
This species may be readily distinguished from 0. regulare^ 
Schloth., by the much greater distance of its septa. 
Horizon. Orthoceratiten-Schiefer, Lower Devonian. 
Locality. Wissenbach, near Dillenburg, Nassau. 
This species is represented in the Collection by a large and fine 
series of specimens, presented by J. E. Lee, Esq., F.S.A., F.G.S. 
I have taken the excellent work of Dr. Hermann Credner (Elemente der 
Geologic, 6th edition, Leipzig, 1887) as my chief authority for the sub- 
divisions of the Devonian rocks of Germany. 
At p, 462 this author gives a very useful table of the “ Divisions and Paral- 
lelisms of the Devonian System, in various Countries,” including Germany, 
Belgium, Britain, and North America ; with some of the characteristic fossils, 
A copy of this table is here given (pp. 82, 83), the fossils being omitted. 
