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Show 1883.] PROF. FLOWER ON THE DELPHINID^. 497 and unique specimen, but they appear to have exceeded 40 in number on each side of each jaw; whereas in C. obscura they do not appear to be ever more numerous than 33. Perhaps Delphinus leucorhamphus of Peron, or Leucorhamphus peronii, Lilljeborg, belongs to this group. It is a Dolphin from the South Seas, remarkable for the absence of a dorsal fin. It is not represented in the British-Museum collection; but a skull in the Museum of the College of Surgeons, which I believe to belong to this species (as it agrees with one so called in the Paris Museum), is not unlike that of Clymenia obscura, having a rostrum broad at the base, and gradually tapering and much depressed. It is of larger size, and the teeth are very small and numerous. Without a knowledge of its skeleton, it is difficult to assign its exact position, or decide whether the absence of dorsal fin entitles it to generic distinction. B. Another distinct form of Clymenia is represented by three skulls in the British Museum. Of these two are marked " Delphinus euphrosyne, 'Erebus ' and * Terror,' " = " Clymenia. euphrosynoides, Supp. Cat. Seals and Whales, p. 71 ; " the other, " Clymenia dorides, Supp. Cat. Seals and Whales, p. 71." " Styx" is also written upon the label of the latter. Upon these specimens, one in the Norwich Museum, and another in the United-Service Museum, the following four species in Gray's ' Synopsis ' and ' Supplement' are founded :- Clymenia (Micropia) euphrosyne. Clymenia (Micropia) styx. Clymenia (Clymenia) euphrosynoides. Clymenia (Clymenia) dorides. In all these the teeth vary from 40 to 46 on each side of each jaw. The anterior nares are very small, with a large flat space in front. I am not able to detect any difference of specific importance between them, and am inclined also to include with them Delphinus marginatum, Duvernoy (in Pucheran, Revue et Mag. de Zoologie, 1854, p. 547), described from two individuals taken at Dieppe, and of which the external and osteological characters are well known, one of the skeletons being mounted in the Paris Museum. It is described by Fischer1, and parts of it figured in Gervais's 'Osteographie.' The skeleton is very like that of D. delphis. The vertebral formula is C. 7, D. 15, L. 22, C. 32, total 76. It belongs to a quite adult animal. The skull is 460 millim. in length, and has il teeth, the antero-posterior diameter of the largest of which is 3 millim. The animal was 2*090 metres in length. After describing the skeleton, Fischer remarks, " Le Delphinus euphrosyne, Gray, de la mer du Nord, est peut-etre identique avec le C. marginata." The single skull from the Mediterranean upon which Gervais founded D. tethyos, now in the Paris Museum, is so similar that I should be disposed to include it also, at all events until some distinc- 1 " Cetaces du Sud-Ouest de la France " (Actes de la Soc. Linn, de Bordeaux, xxxv. p. 150, 1881). |