B.M. Clymene similis, _Gray_, _P. Z. S._ 1868, p. 147, fig. 2. Clymenia similis, _Gray_, _Synops. Whales & Dolph._ p. 6. Skull like _C. obscura_, but palate contracted behind; side of pterygoid bone keeled. Inhab. Cape of Good Hope. ******** ⸺? 13. Clymenia crotaphiscus. Clymenia crotaphiscus, _Cope_, _Proc. Ac. Nat. Sc. Philad._ 1865, p. 13. Supraoccipital rounded in profile; diameter of temporal fossa shorter than the preorbital process; beak very flat, two and a half times the breadth at notch; a keel in front of the nasal meatus. Inhab. Unknown. 14. Clymenia esthenops. Clymenia esthenops, _Cope_, _Proc. Ac. Nat. Sc. Philad._ 1865, p. 12. Outline from foramen to crest curved; cranium rounded; temporal fossa much longer than the postorbital process; width of the muzzle at notch two and a half times or less in the length. Inhab. Unknown. _Var._ Width of muzzle at notch nearly three times in the length; triangle long. Inhab. Unknown. 5. DELPHINAPTERUS. Delphinapterus, _Gray_, _Cat, Seals & Whales,_ p, 276; _Synops. Whales & Dolph._ p. 6. Beak of skull elongate, depressed. Teeth small, slender. Dorsal fin none. Bladebone very broad, nearly semicircular. 1. Delphinapterus Peronii. Delphinapterus Peronii, _Gray_, _l. c._ p. 276; _Synops. Whales & Dolph._ p. 6, t. 15 (animal). Inhab. South Atlantic, New Guinea. c. _Beak short, thick. Palate flat behind, without any lateral groove._ 6. TURSIO. Tursio, _Gray_, _l. c._ pp. 254, 400; _P. Z. S._ 1866, p. 215; _Synops. Whales & Dolph._ p. 6. _Beak of the skull only rather longer than the brain-case, conical, convex above, rounded. Teeth large. Skull high. The skull large, thick, heavy, with a high swollen brain-cavity._ The beak rather longer than the brain-case, broad, conical, stout, shelving on the sides. Teeth large, 22/22 or 22/25. The blower large. Nasal triangle produced considerably before the notch. [Illustration: Fig. 5. Skull of _Tursio truncatus_ (♂), adult. Fig. 6. Under surface of the upper jaw, showing the worn surface.] Vertebræ 62:—C. 7. D. 13. L. 17. C. 25. Second finger very long; third shorter. Breast-bone formed of three pieces, linear, dilated in front. 1. Tursio truncatus. (Figs. 5 & 6.) B.M. Tursio truncatus, _Gray_, _l. c._ pp. 258, 400. no. 6; _P. Z. S._ 1866, p. 215, 1868, p. 561, figs. 1, 2; _Synops. Whales & Dolph._ p. 6, (D. tursio) t. 10. f. 1. Tursiops tursio, _Gervais_, _Ostéogr. Cét._ tab. 34. figs. 3-9. Inhab. North Sea and Mediterranean. Coast of France and Cette (_Gervais_). 2. Tursio erebennus. Delphinus erebennus, _Cope_, _Proc. Ac. Nat. Sc. Philad._ Delphinus tursio, _Cope_, _l. c._ 1865, p. 199. Teeth. 23/22; premaxillaries forming an elevated rounded ridge. Inhab. Philadelphia. 3. Tursio Metis.