66 
UPPER TRIAS, OR 
and not so strong as that given by Klipstein in the royal 
species. 
I understand from my friend Prof. Suess that Von Hauer 
proposes the name Arcestites for this group of globular smooth 
ammonites with numerous foliated lobes. 
All success to the naturalist who first shall rightly divide 
the Ammonites. A more unwieldy group than it was before 
Von Buch hit upon the divisions which bear his name could 
hardly be found, unless it were the Terebratulse before Daf- 
man attacked them. 
The group is still unwieldy, and, what is worse, the sub¬ 
divisions which answered fifteen or twenty years ago refuse 
to receive the newcomers. Arcestites , Cly(Ionites, and any 
other well-formed -ites will be acceptable. 
Amm. Aon , A. Gaytani, and A. Johannis-Austriae are com¬ 
mon to the Hallstadt beds and the celebrated St. Cassian 
strata. 
. AMMONITES BLANFORDII -New Species. 
Plate 6, fig. 2. 
Diameter, fully 3| inches. Length of oval mouth, 1 T a (T 
inch. Width, within the middle of the whorl, 1 inch. 
Whorls but slightly enveloping, flattened on the sides, cprite 
round on the blunt periphery; not excavated, or steep, or much 
curved at the umbilicus, and ribbed from it to near the back 
by straight obtuse ribs, which grow fainter, and do not end 
pi a tubercle or ridge towards the circumference. They are 
there about one-third of an inch apart. None are intermediate 
or shorter than the rest. There is a very slight sigmoid 
curve in each rib, but to all appearance they are straight. 
The lobes are three on each side, besides the obtusely-pointed 
dorsal lobe, which is crenulate—the siphonal interspace 
(saddle) acute. The side-saddles are strictly rounded and 
smooth as in Ceratites — the lobes only serrate-dentate—and 
but simply so— for half their length. 
