Vertebræ 81:—C. 7. D. 15. L. and C. 59.

1. Leucopleurus arcticus.

B.M.

Leucopleurus arcticus, Gray, Synops. Whales & Dolph. p. 7, t. 6. f. 3-5 (fœtus), t. 12 (skull), t. 26. f. 3 (tongue).

Lagenorhynchus leucopleurus, Gray, Cat. S. & W. p. 273. no. 9; Gervais, Ostéogr. Cét. t. 36. fig. 4.

Beak of the skull twice as long as the width at the notch. Teeth small, five in an inch.

Inhab. North Sea.

11. LAGENORHYNCHUS.

Lagenorhynchus, Gray, P. Z. S. 1866, p. 216; Cat. S. & W. p. 272; Synops. Whales &. Dolph. p. 7.