OETHOCEBATIB^. 
33 
is ornamented with very distinct transverse striae, which have a 
downward imbrication, d'hey are from to of a line distant 
from each other, and quite perceptible to the naked eye. Between 
the principal striae one or two are intercalated which do not extend 
to the dorsal side of the shell. Besides these transverse striae, well- 
preserved specimens show a series of faint longitudinal ones, about 
^ line apart. 
RemarTcs. A form similar to this one, associated with 0. Bohemi- 
cum, Barrande, was found by M. de Yerneuil in the black lime- 
stones on the southern flanks of the eastern Pyrenees, at Ogasa, 
Province of Gerona, Spain. L. Mallada also mentions this species h 
Horizon. Etage E, bande e 2 (= Salopian). 
Localities. Lochkow, Kosofz, Bohemia. 
TVell represented in the Collection. 
OrtHoceras transiens, Barrande. 
1866. Orthoceras transiens, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 88, pi. ccxviii. ft'. 8-11, pi. ccxxiv. 
ff. 17-23, pi. ccxcii., pi. ccxciii. IF. 9-12, pi. ccccii. IF. 12-15, 
pi. ccccxlii. ff. 13-15. 
Sp. Char. Section circular. Eate of increase of the shell very 
high, about 1 in 4, or with an apical angle, measured in the septate 
portion, of from 13° to 18°. Septa increasing gradually in their 
distance apart, till this reaches more than i the diameter. Body- 
chamber greatly developed, its length representing from 2-J- to 3 
times the diameter of its base. Siphuncle central. The ornamen- 
tation of the surface presents important differences according to the 
age of the individual. At the commencement the shell is nearly 
smooth ; above this there appear strong and isolated transverse 
striae with direct imbrication, becoming relatively close-set as the 
shell increases in size. Striae of this description occupy the greater 
part of the length of the shell, grouping themselves at frequent 
intervals into faint rings or undulations, which are, however, quite 
visible to the naked eye. Towards the aperture, and espeeiall}^ 
above the constriction, the undulations become obsolete, and 
nothing remains but distinct, generally very prominent transverse 
striae. 
RemarJes. Owing to the high apical angle of this species M. 
-Barrande places it in his ‘ Orthoceres brevicones.’ 
Horizon. Etage E, bande e l,?Zone 4, ColonusBeds (=Salopian). 
Locality. Butowitz, Bohemia. 
Well represented in the Collection. 
Loc. cit. 
I) 
