PART ^.] Grienhach : Valieontological notes, Lower Trias, Ilimalai/as. 109 
Ptychites lawebncunus, DeKon.: Quart. Journ. Geol. Soo., Vol. XIX, 
PL VI, fig. 3. 
As sucli I determine a few not well preserrod specimens. They agree very 
well in general shape and in the formation of lobes with the Salt-range species, 
but with this exception, that my specimens exhibit traces of an ear-like ridge 
near the umbilical margin, thus showing some kinship to Otoccras woodwarLi. 
Further researches in the Himalayas may reveal better si^ecimen.s. 
Of older forms the most nearly allied are Goniatites Iwenmc/havsi, Von 
Buch,‘ G. intumescens, Bey., var. intermedius, Sandb.,'* and G. hualiii,YGvi\.,^ thus, 
showing in some degree a derivation from the early types of Otoceras, and itself 
representing a predecessor of the later PtyaJiites forms of the Muschelkalk. 
Genus: NORITES. 
Norites pt,.yxitlatus, DeKon., var.: Quart. Journ. Geol. Soc., Vol. XIX, 
PI. V, fig. 1. 
My species differs somewhat from DeKoninok’s figure, in that the rib.s on the 
sides of the shell are more strongly marked and seem indeed to form tubei'- 
culous masses ; the siphonal part is perfectly flattened, and resembles in that 
Norites gondola, Mojs. This species is common in the higher beds (89) of the 
Campiler group of the lower trias. 
There is an excellent predecessor to this species found in Goniatites temiistri- 
atus, Vern.^ 
Tribe : LYTOCERATIDJE. 
Genus: OPHICERAS.- 
Under this generic name I propose to unite forms which possess the external 
characters of the Lytoceratidw, but possess a much simpler lobe-line even than 
Monoplnjllites, and must be considered as an older stage of development of the 
Lytoaeratites, which appear first in the Muschelkalk. For the description of 
the generic characters I refer to Ophiceras tileticum, n. s., which may be looked 
upon as the type of my genus. 
Ophiceeas tibeticum, n. sp. Plate III, figs. 1 to 7. 
Shell compressed, section of whorls oval and widening near the umbilicus 
(see figs. 2 and 3) ; the latter largo and shallow. The shell with seven to nine 
whorls, each covering a little more than a third of the pi’cceding one. The shell 
is thick, especially so near the umbilicus, and covered with fine wrinkles or lines 
of growth S-shaped and bent forward near the sijihonal side (figs. 4 and .“>) 
In the body-chamber, they assume the character of fine S-shaped ribs (fig. C), 
resembling in that stage the ribs of Lytoaeras'shnonyi, Hau., with which species my 
form corresponds in many characters. At in’ogular intervals the shell swells into 
rounded bumps, largest near the umbilical margin. The siphonal side is rounded, 
* Trans. Geol. Soc., Vol. VI, 2nd Scr., PI. XXV, fig. 7, 
^ Rhein. Scliiclit. Syst., PI. VII, fig. 2. 
= Trans. Geol. Soc., Vol. VI, Bnd Scr., PI. XXVl, fig. 1. 
Trans. Geol. Soc., Vol, VI, 2na Scr., PI. XXVI, fig. 7. 
* Oi/ji? = .serpent. 
