UPPER TRIASSIC, OR 
63 
Comparing the sutures with those figured by Prof. Hatter, 
I observe a little difference in the dorsal lobe of our Hima- 
1 ayah specimens, which has rather a long process, intermediate 
between it and the first lateral lobe. This process is absent 
in Yon Hauer’s excellent figure (fig. 14 f ). 
Prof. Suess detected the young of this Ammonite (which 
by the bye, was divided by its first describer, Wiilfen, into four 
species*), in the Ceratite-like fossils figured in PI. 8. These 
young specimens do not in all respects"accord with Von Hauer’s 
figure. They are not so thick in proportion ; even the fig. 8, 
which must be regarded as the £ form, has not the breadth 
and obtuseness of Yon Hauer’s, fig. 6. Nor do his figures 
show the rudimentary ribs, so conspicuous in Sowerby’s draw¬ 
ing (fig. la, b, cl ). This last must be the $ form, as it is 
so much thinner. 
These rudimentary ribs just show themselves a little in the 
youngest portion of our principal figure, PI. 6. And that M. 
Suess is right in referring the young specimens to the same 
form, I do not doubt. 
Prof. Hauer considers the A. Floridus to belong to the 
Falciferi. Most of the Trias ammonites are of the Globosi 
group. 
AMMONITES AON.-Jlfunrf. 
Plate 7, fig. 6. 
Munster and Wissmann. Bcitr., vol. iv., t. 15, f. 27. Von Hauer. 
Naturwiss. Abh., vol. iii., t. 5. f. 4-G. 
Our specimen is so much unlike Munster’s larger figures 
(1. c. fig. 27) in having only five rows of knots instead of 
nine on each side, and still less like Yon Hauer’s of the same 
species, from Aussee, that I can only yield to M. Suess’ 
judgment, as I have every right to do. The specimen here 
figured is clearly a young shell, the sutures (fig. 6 e) not 
having lost their Ceratite character. 
* Nautilus floridus, bisulcatus, &c. Carnthnerisch. Hclminthol. 1793. It 
is the Amm. bijmnctulus, Qucnstcdt. 
