TISSOTIID®. 49 
METATISSOTIA AURESSENSIS (Peron). 
Tissotia auressensis Peron, 1897, Mém. Soc. géol. France, Paléontologie, Vol. VII, 
No. 17, pl. 18, figs. 4, 5. 
This is a cast of what is apparently an old shell. The form is not 
unlike that of Paratissotia grossouvrei, with a similar large umbilicus, and it 
might be considered as perhaps the gerontic stage of this species, but the 
sutures are so distinct that this supposition is not tenable. These have 
extraordinarily large and long phyllitorm saddles, and the first lateral 
saddle has a conspicuously trifid base. 
Locality: North Africa. 
Age: Senonian. 
METATISSOTIA SLIZEWICZI (Fallot). 
2. 
Tissotia slizewiczi Grossouvre, 1893, Ammonites Craie supérieure, p. 46, fig. 25; 
pl. 7, fig. 2. 
Buchiceras slizewiczi Fallot, 1885, Ann. sci. géol., Vol. XVIII, p. 240, pl. 2, fig. 
ae 
This species, if correctly given by Grossouvre, has a young form which 
at a diameter of 41 mm. has a truncated venter, continuous keel, a line of 
small tubercles along each ventro-lateral angle beginning on the last 
volution at about this size, and also a line of nodes on the umbilical 
shoulders. The form at this stage is like that of Tissotia ef. fourneli Peron. 
The sutures are also similar in having trifid first lateral saddles and other 
saddles and lobes long and large. The three marginal saddles and lobes 
are much more completely developed, longer, and the first lateral saddles 
broader in consequence of this differentiation of the outlines. The nodes 
on both lines are much larger in the large shell figured and the keel 
persists. The umbilicus is also of good size, as in the species of Peron 
referred to above. Peron considers all of these forms to have occurred 
in the Senonian, and his evidence is very strong on this point. 
Locality: France. 
Age: Coniacian, base of Senonian. 
Q3——4 
MON XLIV 
