Lamellorthoceratids are distinguished by cameral deposits consisting of simple or bifurcating epispetal, or rarely hyposeptal lamellae, set radially with respect to the siphuncle; often filling the entire posterior part of the shell.
12.
"Sactorthceras " was named by Kobayashi in 1934 to include smooth or striated, straight or slightly curved longicones with short camerae and slender, subcentral, suborthochoanitic siphuncles with segments slightly inflated and no cameral deposits.
13.
Some of the earlier nautiloids deposited calcium carbonate in the empty chambers ( called " cameral deposits " ) or within the siphuncle ( " endosiphuncular deposits " ), a process which may have been connected with controlling buoyancy.
