PLATE 35. 
AMMONITE. LIMESTONE. 
FIG. I, 2. 
CONCHYLIOLITHUS N. Ammonites (Luklii) an- 
fraclibus extrinsecis teretibus : striis longitudinalibus 
elevatis denticulatis, disci centro pervio, dissepimen- 
tis integerrimis concavis. S. p. 
A petrified shell. The original a Nautilus, Spiral, de- 
pressed. (See Syst. Gen. 6. Fam, Ammonita.) The volu- 
tions wholly external, or in no degree inserted into each 
other; round, tapering, and longitudinally striated; the 
striae prominent, equal, accutc, and denticulate. The 
number of volutions two*. Centre of the disk pervious. 
Dissepiments very entire, and concave. The siphuncle 
simple, placed near the back or outer part of the volutions. 
A beautiful and rare species. The specimen figured, was 
found in a mine near Ashford. 
Fig, 1 and 2 represent it in different positions. 
* Perhaps more. In the only specimen I have seen, the outer volution 
appears to have been continued ; but not beyond half a whirl further. 
