Ser. XV. HIMALAYAN FOSSILS, Vol. IV. THE FAUNA OF THE SPITI ...

HIMALAYITES. 137
H. kutianus has been reported from the Upper and Middle Spiti Shalea
near Kuti (Coll. Krafft).
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HIMALAYITES SCHLAGINTWEITI, n. sp.
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1865. Ammonites Seideli, Oppel (pars), Palceontologieche Mittheilungen IV, p. 283.
Dimensions:—
Diameter 51 mm.
ThiclmesB at the tubercles . . . . . . . . . 23-5
Thickness between the tubercles . . . . . . . . . 20 „
Height of the last volution above the umbilical suture . . . . 19 „
Width of umbilious . . . . . . . . . . . 19 „
The specimen on which the present species is founded and which, unfortun-
ately is rather small, was referred by Oppel to Ammonites Seideli, but to all
appearance represents an independent species which differs from H. Seideli by
its much narrower umbilicus, a more rapid increase in size, and volutions which
are less rounded., but which are higher and somewhat more flattened on the
flanks and ventral face. From the tubercles radiate outwards three to four
secondary ribs which are somewhat more strongly inclined forward than in H.
Seideli. The intercalary ridges which occur between the tuberculiferous ribs
are partly simple, partly divided into two subsidiary ribs. Along the median
line of the external margin a slight weakening of the ribs is noticeable. The
specimen is chambered up to its anterior extremity, but the septal sutuies are
unfortunately not visible.
Closely allied to H. Schlagintweiti appears to be a form from the Tithonian
of Cabra which W. Kilian 1 has described under the name of Hoplites Malbosi
Pictet. In both species the volutions are rather slender, and the umbilicus is
comparatively narrow; but the intercalary ribs of the Andalusian species are
much more numerous than those of our species, so that the two are not likely
to be specifically identical.
' The specimen is from Spiti and is preserved in the Palaeontological State
Collection in Munich.
, HIMALAYITES, sp. ind.
A specimen from Kuti which measures 60 mm. and is somewhat distorted
by compression (Coll. F. H. Smith) represents a new species, but is too badly
preserved for accurate definition. The shape of the volutions and the sculpture
are similar to those of H. Seideli, but it differs by its decidedly narrower
umbilicus. We have to content ourselves with this short notice and postpone
the characterization of the new species to a time when new finds have been
made.
l Mission d'Andalousie, pi. XXXII, fig. 4, p. 670.
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