OETHOCERATID.?:. 
45 
Orthoceras capax, Barrande. 
1868. Orthoceras capax, Barrande, Syst. Sil. de la Boheme, toI. ii. 
Texte iii. 1874 (janvier), p. 485, pi. cccxxii. ff. 10-14, pi. cccxxix. 
£f. 15-22, pi. ccccxxvi. ff. 8-10. 
Sp. Char. Section circular. Bate of tapering from 1 in 4 to 1 in 
5. The distance between the septa increases gradually until it 
attains half the diameter of the shell. The body-chamber attains 
a length of at least from 2| to 3 times the diameter of the base. 
The siphnncle is central or very nearly so. The surface is ornamented 
with horizontal, somewhat prominent riblets, about 4 per line. 
Horizon. JEtage E, bande e2 ( = Salopian). 
Localities. Lochkow, Kosofz, l^ohemia. 
'Well represented in the Collection. 
Orthoceras Neptunicum, Barrande. 
1868. Orthocei'as Neptimicumy Barrande, Syst. Sil. de la Boheme, 
vol. ii. Texte iii. 1874 (janvier), p. 247, pi. ccxxii. ff. 25, 26, 
pi. cclxxii., pi. cclxxiii., pi. cclxxiv., pi. ccci. ff. 27-30, pi. ccccxliii. 
ff. 1-4, pi. cccclii. ff . 3-5. 
Sp. Char. Section most frequently circular, but in some specimens 
it is decidedly elliptical. Bate of tapering about 1 in 9. The 
distance between the septa increases gradually to a maximum of 
I the diameter, so that they are rather close together upon the whole. 
The length of the body-chamber equals about twice the diameter of 
its base. The siphuncle is at first central, but it gradually becomes 
eccentric as it approaches the last few septa, where it is situated 
about midway between the centre and the periphery. The surface 
ornamentation is somewhat complicated. It consists principally of a 
series of longitudinal riblets, variable in size, and so close-set as to 
require 6 or 7 of them to fill the space of one line ; these are 
covered by a series of extremely fine transverse lines, which fill the 
concavities between the riblets, and pass over the latter. In addi- 
tion to these ornaments the young shells are furnished with tolerably 
prominent undulations. 
Horizon. Etage E, bande e2 ( = Salopian). 
Locality. Dlauha Hora, Bohemia. 
Several fine examples in the Collection. 
Orthoceras araneosum^ Barrande. 
1868. Orthoceras araneosum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 283, pi. cccxxxvii., pi. cccxxxviii., 
pi. cccxxxix., pi. cccxl. 
