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A discussion of the systematic position of the conodonts formed the basis of the senior author's first paper published in 1878^At various times since that date, and during the past 20 years in association with the junior author, lie has made quite extensive collections and studies of these difficult toothlike organisms. In his first paper, the senior author accepted somewhat reluctantly the prevailing opinion that the conodonts, like the more unquestionable annelid jaws, were the booklets of species of annelids. In the subsequent comparison the true conodonts were early discriminated from the annelid jaws by him but until the present time no opportunity has been afforded to prepare and publish the results of these studies.The main intention of the present publication is to make these

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PROCEEDINGS OF THE NATIONAL MUSEUM vol.76 graph he described another new and very different species {T. salteri)^from the Balclatchie group of Scotland. Except Barrande none of the mentioned authors even discussed the generic relations of Telephus. The first to give us anything like a true estimate of these relations was Hadding/ who, in a paper specially devoted to the species of Telej^hus known in 1913, supplied much desired information concerning the palpebral lobes, eyes, and free cheeks. On the basis of these new data he endeavored to show the previously unsuspected relations of the genus to the Aeglinidae, on the one hand, and the Remopleuridae, on the other. Still, he found sufficient differences to convince him that Telephu

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