LONGITUDINAL SECTION IN VERTICAL PLANE
Siphuncle, a porous tube which passed through the Septa,connecting the water and gas-filled septal chambers of the Phragmocone.
Neutral buoyancy was achieved by regulating the proportions of water and gas.
Note the ventral positioning.
Fragile and seldom-found Pro-ostracum supported projecting soft tissues
Morphology varies from species to species but always exhibits the components in a similar configuration.
The ‘usual’ Belemnite find consists of the Rostrum.
Common names :- ‘thunderbolts’, ‘Devil’s fingers’ & ‘St Peter’s Fingers’.