Balæna gibbosa, Gray, Cat. Seals & Whales, p. 90.

Scrag Whale, Dudley, Phil. Trans. xxxiii. p. 259.

Inhab. North Atlantic.

2. RHACHIANECTES.

Rhachianectes, Cope, Proc. Acad. N. Sc. Philad. 1869, pp. 14 & 15.

Cervical vertebræ free. Throat without plaits. Dorsal fin none. Scapula without acromion.

1. Rhachianectes glaucus. The Californian Grey Whale.

Rhachianectes glaucus, Cope, Proc. Acad. N. Sc. Philad. 1869, pp. 17 & 40, fig. 8.

Agaphelus glaucus, Cope, ibid. 1868, p. 225.

Inhab. California, San Francisco.