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The Delphinus Gangeticus is described by the late Dr. Roxburgh, in the seventh volume of the Asiatick Researches, published in 1781; but no farther account is given of its teeth, than that the number is 120, 30 in each jaw, nor have I met with any description of them in other publications. Dr. Shaw published his second volume of General Zoology, in which the whale tribe is mentioned, in 1801. He says, a narrow snouted dolphin is supposed to inhabit the Indian seas; but it is only known to us from specimens of the head and jaws. The jaws are extremely narrow, the teeth small, not numerous, distant, and shaped somewhat like the molares of quadrupeds. This description corresponds so ill with the teeth of the Delphinus Gangeticus, that it would almost induce us to believe that it is meant for those of another animal. A specimen of the upper and lower jaw of the Delphinus Gangeticus was given to me, 17 years ago, by Sir Joseph Banks, and has been deposited ever since in the Hunterian Collection; but it was only the other day that an accidental reference to the Asiatick Researches led us to discover the animal to which they belong. The singularity of the teeth made it always a remarkable object, and now the animal is known, a description of them may not be undeserving the attention of this Society.

XXI. A description of the teeth of the Delphinus Gangeticus