(oe) AMMONITID. 
the body-chamber. Impressions of the mantle attachment pune- 
tate or striate. Wrinkled layer consisting of broken-up striz. 
The sutural line of the septa is distinguished by the presence of 
external adventitious lobes. Three groups of lobes may accord- 
ingly be distinguished: 1. The adventitious lobes. 2. The three 
principal lobes. 38. The auxiliary lobes. The adventitious and 
auxiliary lobes always present a similar structure, whilst the 
principal lobes frequently present a peculiar form. 
SAGECERAS, Mojs., 1873. 
Distr.—i sp. Permian and Triassic. Sageceras Haidingert, 
Hauer (xl, 48, 49). 
Close to Pinacoceras in the form of the shell and length of 
the body-chamber, and differs from it in the structure of the 
wrinkled layer, the form of the lobes and the direction of the 
lines of growth in the concave portion. The wrinkled layer is 
coarsely granular, as in Nautilus, and does not consist of long 
striz and threads, as in the Arcestz. The saddles are slender, 
narrow, tongue-like, entire, the lobes symmetrically divided, 
simply or doubly, by simple conical teeth. Three groups of lobes, 
as in Pinacoceras. The lines of growth do not trend backwards, 
as in Pinacoceras, but forwards. 
Sageceras is alre eady fully developed in the Permian formations, 
though i in these older forms the siphonal process characteristic 
of the Ammonite stage is wanting. 
NOVITES, Mojs., 1878. Wrinkled layer striated; an adventive 
saddle not reaching the height of the first principal saddle ; saddles 
narrow, elevated, rounded at their superior extremity ; lobes but 
little truncate; first principal lobe divided. S. Caprilensis, Mojs. 
MEDLICOTTIA, Waagen, 1880. Siphonal side (periphery) either 
excavated and rounded on both sides by high and sharp crests, 
or simply flattened, and defined on both sides by angular margins. 
In both cases the high and narrow saddles developed on each 
side of the siphonal lobe are situated exactly below the crests 
or the angulated margins; these saddles are strongly serrated 
from both sides, and the denticulations of the opposite sides of 
the saddle correspond exactly with each other. IM. Wynnei, 
Waagen (xxxix, 43,44). Productus Limestone (Carboniferous) ; 
India. 
OrocERAS, Griesbach, 1881. 
Distr.—O. Woodwardi, Griesb. (xxxix, 40-42). L. Triassic ; 
Himalayas. 
Shell involute, with very deep umbilicus, and rapidly increasing 
outer whorls; the part nearest the umbilicus bulged out into an 
ear-like shape, giving the section of the shell a more or less 
rhomboidal aspect. It is very probable that in adult individuals 
the last whorl covered and enclosed the entire preceding shell. 
