. Baculites gigas. 
Planospirites ostracinus. 
. Hippurites cornu-copiw. 
. Belemnite. 
. Siderolites calcitrapoides. 
. Section of a Belemnite. 
. Orthoceratite. 
. Hippurite with a gutter, c. 
. Hippurite with a siphon. 
. Under view of the operculum of a Hippurite, shewing the two prolonga- 
tions resembling a hinge. 
. Belemnite. 
. Section of an Orthoceratite with a siphon passing through the axis. 
. Hippurite, with a gutter, a. and a siphon, d. 
. Lituites Breynii, found in the marble of OEland: the shaft or straight 
part extends in a length equal to the depth of the Plate, gradually 
enlarging towards the base. 
. Hippurite, the operculum pierced with two eyes. 
. 35. Orthoceratites with a siphon towards the edge or periphery. 
