†† The lateral rings of the cervical vertebræ shorter than the diameter of the bodies of the vertebræ.—Gray, l. c. p. 374; Synops. Whales & Dolph. p. 2.

3. Physalus patachonicus.

Physalus patachonicus, Gray, l. c. p. 374, figs. 76-86; Synops. Whales & Dolph. p. 2.

Inhab. River Plata.

4. Physalus brasiliensis.

B.M.

Physalus brasiliensis, Gray, l. c. p. 162.

Balænoptera brasiliensis, Gray, Zool. Ereb. & Ter. p. 5.

Inhab. Bahia.

Mystica differs from the norwega in having the back black and the belly and throat furrowed. Sometimes there are white spots on the side.