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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