orthoceeatidj:. 
75 
section they have a chain-like appearance. The position of the 
grooves is marked upon the cast by a series of acute raised lines. 
Hemarl's. An examination of several Bohemian examples of this 
species in the Xational Collection has satisfied me that Barrande 
was correct in identifying his species with Munster’s. 
The latter author describes the present species as follows : — ‘‘ A 
short, conical shell, like 0. conoideus [Munster], from which it is 
distinguished essentially by the pretty markings of the external 
shell ; this is striated from the apex to the base ; the striae are 
near together at the apex, getting wider apart towards the base, in 
proportion as the shell increases in thickness. The raised striae 
alternate with furrows, in which are to be found a row of 
elevated points. AYhen the outer shell is fiaked off a fine, raised 
line is exhibited upon a smooth surface, in the place of the deep 
punctured line.” 
Munster’s reference to a “ row of elevated points *’ in the grooves 
between the striae may be explained by the fact that in many 
specimens the external layer, when torn from the shell, leaves 
portions of its substance in each of the punctures, so as to give 
them the appearance of elevated points. Barrande figures a speci- 
men in this condition (loc. cit. pi. ccccxlvii. f. IG). Munster’s 
figures appear to me to give an excellent representation of the 
characters of this species. 
Professor Blake has united 0. striato-pmictatum with 0. oriyincde^ 
Barr., on tlie ground that the punctate grooves in the former are 
not of sufficient importance for specific distinction. This, however 
is not the only character in which the two forms differ from each 
other. The bands which ornament the surface of O. orl(/inale are 
striated, whereas in 0. striato-punctatum they are smooth. I think, 
therefore, that the former species should be separated from the 
latter, at least as a variety, in recognition of the above characters. 
H(/rizon. Etage E, bande e 2 ( = Salopian). 
Localities. Kosofz, Lochkow, Bohemia ; Elbersreuth, Bavaria. 
Well represented in the Collection. 
Yar. originale, Barrande. 
1865. Orthoceras dulce, Salter, Cat. Foss. Mus. Pract. Geol. p. 75. 
\^Not of Barrande.] 
1873. Orthoceras clulce, Salter, Cat. Cambr. and Sil. Foss. p. 159. [Ab^ 
of Barrande.] 
1868. Orthoceras originale, Barrande, Syst. Sil. de la Bolieme, vol._ ii. 
Texte iii. 1874 (janvier), p. 20G, pi. cclxvii. 
1882, Orthoceras originale, Blake, British Foss. Ceph. pt. i. p. 110, 
pi. vii. ff. 5, 5«, 10. 
