﻿Fucoids of the Cincinnati Group. 



165 



First, inorganic causes, including Aristophycus ramosum and var. germ- 

 anum; Chloephycus plumosum, and, as a synonym, Buthotrephis filciformis; 

 Trichophycus venosum, T, sulcatum; Arthraria antiquata, including A. 

 biclavata ; Discophycus typicalis; Cyathophycus subsphericus ; Dystacto- 

 phycus mammillanum ; Heliophycus stelliforme. 



Second, to trails and burrows, as follows: Trichophycus lanosum, includ- 

 ing, as a synonym, Blastophycus diademata; Palceophycus radiata, includ- 

 ing Dactylophycus tridigitatum and D. quadripartitum ; Palceophycus 

 virgatus; P. rugosum ; P. tubular e; Buthotrephis succulosa ; B. ramulosa; 

 Saccophycus intortum; Cruziana subangulata, including species as before 

 mentioned (see ante, p. 156); G. aspera; C. pudica; G. bilobata; G.carleyi. 



Third, and last, to the Hydrozoa, viz.: Dendrograptus gracillimum, to 

 include Buthotrephis gracilis and its varieties (see ante, p. 160) and Psilophy- 

 gracillimum ; Locheia siliquaria; Inocaulis (JLicrophycus) flabellum. 



Conclusion. 



In this paper there has been no attempt to rename any of those species 

 which have attached to them the suffix "phycus," to indicate their plant- 

 like nature. It seems a mere piling up of unwarrantable names and a 

 complication of the synonymy to do so. Those whose nature has been 

 shown to be inorganic, should be allowed to sink into oblivion. Those 

 representing trails or burrows are, perhaps, convenient as a matter of ref- 

 erence, but they should no longer be attached to the Algae ; while those 

 here referred to the Hydrozoa should take their places in the class to which 

 ton they belong. 



Since these investigations were undertaken, and after the major part of 

 this paper was written, I find that Mr. S. A. Miller, in the " Supplement 

 to his Catalogue of Palaeozoic Fossils," acknowledges that Aristophycus and 

 Chloephycus are "probably inorganic." All the others remain in their 

 original places in the class Algae. I am also informed by Professor 

 Lesquereux, that several years ago the late Mr. Dyer sent him a large box 

 of these fossils, with the request that he describe them. This he declined 

 to do, returning them with the remark that they were too fragmentary 

 and too ill-defined to be of scientific value. Afterward many of these 

 were described as fucoids by Miller and Dyer in the Contributions to Palae- 

 ontology, so often referred to in this paper. 



Professor Lesquereux has been kind enough to forward to me a French 

 translation of a memoir written in Swedish by Professor Nathorst. In 

 this memoir are given the results made by Professor Nathorst in endeavor- 

 ing to produce, artificially, marks found fossil. He succeeded admirably, 



