( 22) 
DIVISION VII. AMMONACE. 
GENERA. 
4. Ammonites. Brug. 
Septa of the chambers  A_ siphon, generally | Abounding in the Se- 
undulated at the mar- marginal. condary Mountains, 
gins. (4) from the size of a pin to 
that of a coach-wheel. 
a. Ammonites, Zam. All the turns visible. Pl. 1, fig. 45. 
6. Orbulites, Lam. The last turn enveloping all the others. Pl. 3, fig. 14, 12. 
(1) According to Spallanzani, there are vast beds of Ammonites in the environs 
of Nevers. They have been found in England, in all the formations from the 4st 
or alluvium, to the Sth or first sand stonc, inclusive. 
DIVISION VIII. NAUTILACES. 
GENERA. 
1. Naurinus. 
The last turns of the | Septa numerous, sim- —_-YV.. Animal, p. 54. 
spire not only touch but ple, transverse, siphun- 
envelope the preceding. culated. 
PI. 2, fig. 2, 3, 4. 
a Nauzinires, (1) 
§ Microscopic. 
a Lenticulina, (2) Lam. The last turn, as in the existing species, pl. 2, fig. 17. 
} in the middle of the septa. 
*\ towards the anterior edge. 
towards the edge. 
scattered. 
ranged in a longitudinal line. 
ranged in a transversal line. 
33-0 , § longitudinal. 
A slit, instead of a siphon. . yiltrasbueréals 
& Rotalites. (3) Lam. The mouth placed more on one side than the other, 
or entirely on one side, pl. 2, fig. 13... 
y Discorbites. (3) Lam. All the turns visible, pl. 4, fig. 5. 
CP) ae The last turn very large in comparison with the 
rest of the spire. 
One siphon. 
Several siphons... 
§§ Large or moderate. 
a Angulites.(4) Montf. One siphon. 
f Bisiphites. Montf. Two siphons. 
y Planulites. Lam. Siphon towards the edge. 
§ Ellipsolites.(5) Montf. Spire elliptic, pl. 3, fig. 15. 
» Amaltes. Montf- Siphon in the middle. 
(1) Foss. in the London Clay; Crag Marl; Chalk Marl; Green Sand ; Under 
Oolite ; Blue Lias; Derbyshire Peak or Mountain Lime Stone. 
(2) Foss. at Senlis; Soisson; Grignon; Meudon. Lamarck possesses Lenticu- 
line in the recent state which were found in 125 fathoms off Teneriffe. 
(3) Foss. Grignon. 
(4) Foss. Grignon. Defrance has received specimens in the recent state from 
New-Holland and the Red-Sea. 
(5) Foss. in the Derbyshire Peak Lime Stone. 
