Baltoceras

Baltoceras is a baltoceratid (Nautiloidea, Ellesmerocerida) with a slender shell, subcircular in cross section. Sutures marking the chambers are straight and transverse. The siphuncle is relatively large and in contact with the ventral margin.

Baltoceras is similar to Rioceras, although younger in age.

References
 * Rousseau H. Flower 1964, The Nautiloid Order Ellesmeroceratida (Cephalopoda). New Mexico Bureau of Mines and Mineral Resources Memoir 12.