32 
NAUTILOIDEA. 
In Munster’s species, as we have seen, the siphnncle is central, 
not marginal, and therefore I cannot understand why the Messrs. 
Sandherger should have identified their form, in which the 
siphnncle is as close to the margin as it could possibly be, with 
this one. 
Horizon. Etage E, bande € 2 ( = Salopian). 
Locality. Butowitz, Bohemia. 
Fairly well represented. 
Orthoceras timidum, Barrande. 
1868. Orthoceras timidum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte hi. 1874 (janvier), p. 388, pi. ccxvii. ff. 6, 7, pi. cccxv. 
ff. 20-32, pi. cccxxvii. ff. 19, 20, pi. ccccxxiv. ff. 30-32. 
Sp. Char. Section circular, or very slightly flattened. Hate of 
increase about 1 in 7. Septa augmenting gradually in their 
distance apart till about ^ of the diameter is attained ; their 
convexity equals | the diameter. The length of the body-chamber 
averages 3 times the diameter of its base. The siphnncle is 
central. The surface is ornamented with very distinct transverse 
undulating striae, having an upward imbrication. 
This is one of the most widely diffused species of the Bohemian 
basin. A form resembling 0. timidum was collected by M. de 
Yerneuil in the black limestones of Ogasa, Province of Gerona, 
Spain. The species is cited also by L. MaUada \ 
Horizon. Etage E, bande e 2 ( = Salopian). 
Locality. Wiskocilka, Bohemia. 
Well represented in the Collection. 
Orthoceras placidum, Barrande. 
1868. Orthoceras plaeidmiij Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte hi. 1874 (janvier), p. 410, pi. ccxcvih. ff 18-35, pi. 
ccclxvii. ff. 19-21. 
Sp. Char. Section elliptical, the ratio of the two diameters being 
as 15 : 13. Hate of increase about 1 in 16. Septa oblique and 
undulating, increasing in their distance apart to about | of the 
diameter of the shell. The length of the body-chamber equals 4 
or 5 times the diameter of its base, and represents about | the 
entire length of the shell. The aperture has an obliquity of 
nearly 35°. The siphnncle is nearly always central. The surface 
^ “ Fosiles de Espafia,” Bol. Com. del Mapa geol. de Espafia, 1875, tom. ii. 
p. 25. 
