Rudolphius, Gray, l. c. p. 170; Synops. Whales & Dolph. p. 3.
Sibbaldius, Lilljeborg, Nova Acta Upsal. vi. 1867.
Dorsal fin compressed, falcate, two-thirds the entire length from the nose. Ribs 13·13; first rib short, dilated at the external end. Sternum elongate, not narrow at posterior lobe. Fingers elongate; the second finger rather shorter than the forearm-bone. Scapula very broad, with a large broad acromion process and a moderate coracoid one.
1. Rudolphius laticeps.
B.M.
Sibbaldius laticeps, Gray, l. c. p. 170, figs. 37, 38.
Rudolphius laticeps, Gray, Synops. Whales & Dolph. p. 3.
Balænoptera laticeps, Van Beneden, Ostéogr. Cét. t. 10 & t. 11. figs. 11-35.
Inhab. North Sea.
Nose of skull more than twice the length of brain-cavity from the nasal bones.