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Show 1868.] DR. J. E. GRAY ON A NEW DOLPHIN. 147 ferent names, and to give a short diagnostic description of them, and also to figure the differences, and thus draw attention to the tact, leaving it to be verified by future observers under more favourable circumstances; and I have briefly described the skull of the very young specimen, which I believe belongs to one of these species, to show the variation that exists between the skulls of the young and adult animals. Fig. 2. Pterygoid bones and binder nasal opening of skull. Fig. 1. Clymene obscura. Fig. 2. Clymene similis. 1. CLYMENE OBSCURA, Gray, P.Z. S. 1866, p. 215. Tursio obscurus, Gray, Zool. Ereb. & Ter. t. 16. Black. Teeth jj|, very slender, rather far apart, five in an inch. The palate in front of the pterygoid bones broad, flat. The pterygoid bones bluntly keeled, with a comparatively shallow broad angular concavity between the ridges. Hab. Cape of Good Hope. 2. C L Y M E N E SIMILIS, n. sp. Black, white beneath. Teeth ||, straight, tapering, rather close together, five in an inch. Palate much contracted in front of the base of the pterygoid bones. Pterygoid bones rather sharply keeled, with a deep angular narrow concavity between the ridges. Hab. Cape of Good Hope (Layard). This species is chiefly known from the preceding by the larger |