ORTHOCERITID^. 
35 
HoAzon. Etage E, bande e 2 (=Salopian). 
Localities. Butowifcz, Dlauha Hora, Bohemia. 
Well represented in the Collection. 
Orthoceras Minos ?, Barrande. 
1868. Orthoceras Minos, Barrande, Syst. Sil. de la Bohenie, vol. ii. 
Texte iii. 1874 (janvier), p. 524, pi. cccxxx. ff. 1-4. 
Sp. Char. Section elliptical. Rate of tapering about 1 in 10. 
Septa approximate ; about 3 lines distant in a diameter of 18 lines. 
Body-chamber unknown. Siphuncle central ; the form of its 
elements unknown. Surface of the test consisting of striae having 
an obliquity of 25° to the long axis of the shell. 
Horizon. Calcaires ampeliteux ( = Third Fauna of Barrande). 
Locality. FeugueroUes (Calvados), France. 
One very imperfect specimen. 
Orthoceras socium, Barrande. 
1866. Orthocet'as socium, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 449, pi. ccxiii. ff. 7-9, pi. ccxxii. 
ff. 2.3, 24, pi. ccxxvii. f. 4, pi. cccsii. ff. 9-12 , pi. cccix. ff. 5-7. 
Sp. Char. Section circular. Rate of increase about 1 in 15. 
Septa from -J- to f the diameter distant from each other. Body- 
chamber only known by fragments belonging to its base. Siphuncle 
very slightly eccentric. Surface ornaments consisting of very fine 
and close-set striae, which have a direct imbrication. 
This species resembles in its general aspect 0. pelagium and 
0. rivale ; but it is distinguished from the former by its circular 
section and more regularly arranged striae, and from the latter by 
the much closer disposition of its striae and by its more nearly 
central siphuncle. 
HoAzon. Etage E, bande e 2 (= Salopian). 
Locality. Dlauha Hora, Bohemia. 
Well represented in the Collection. 
Orthoceras asparagus, Barrande. 
1868. Orthoceras asparagus, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 428, pi. cccxvii. ff. 1-5. 
^p. Char. Section slightly elliptical. Rate of increase extremely 
slow, not exceeding 1 in 28. Septa widely separated, the maxi- 
mum distance between them being about |- the diameter. The 
body-chamber is unknown. The siphuncle is eccentric, but in- 
D 2 
