366 G. H. CHADWICK STRATIGRAPHY OF NEW YORK CLINTON 



pear logical to gradiially eliminate it b}^ substituting a name for each half. 

 It is not expected that this step, or indeed any of the changes herein pro- 

 posed, will be adopted without full discussion (see Science, new series, 

 volume 39, 1914, footnote to page 918) and much further field-work, par- 

 ticularly in the eastern area. The proposals must be considered tentative, 

 opening the way to restudy of the whole problem. 



Paleontologic Summary 



In order to complete the fauna! lists, the following names are applied 

 to some of the "fucoids'^ described without names by Hall (3) : 



Arthraria dicephala, nom nov., for New York Paleontology, volume 2, plate 10, 



figure 6. 

 Conostichusf medusa, nom nov., for New York Paleontology, volume 2, plate 7, 



figure 2. 

 Conostichusf polygonatus, nom nov., for New York Paleontology, volume 2, 



plate 10, figures 9, 10. 

 Conostichusf circulus, nom. nov,, for New York Paleontology, volume 2, plate 



10, figure 4. 

 Dactylophycus pes-avis, nom. nov., for New York Paleontology, volume 2, plate 



10, figure 3. 

 Palceophycus hacterium, nom. nov., for New York Paleontology, volume 2, plate 



9, figure 4. 



Spliyradocerdsf mdlti, sp. nov., is used without description for a new 

 form of considerable beauty from the Clinton drift boulders at Clarendon 

 that have afforded also a handsome new Goldius. The descriptions of 

 these and other new forms obtained from our Silurian strata are deferred 

 to a later publication. 



The follovv^ing combinations believed to be new are used herein : 



Aristophycusf hetcrophyllum (Fucoides heterophyllus Hall). 



Aristophycusf cf. heterophijllum, for New York Paleontology, volume 2, plate 8, 



figure 4. 

 Asterophycusf palmatum {Buthotrcphis palmata Hall, plate 6, figure 1). 

 Atrypa reticularis afflnis {Atrypa affinis Vanuxem, not Sowerby?). 

 Blastophycusf impudicum {Buthotrcphis impudica Hall). 

 Botryocrinus plumosus {Glyptocrinus plumosus Hall). 

 Camarotcechiaf Mdens {Rhynchonella Mdens Hall). 



Camarotoechiaf emacerata {Rhyncho7iella emacerata Hall). / 



Chondrites f ramosus (Buthotrcphis ramosa, Hall). 

 Ccelospira iiitens {Orthis nitens Vanuxem; Atrypa hemispherica Hall, not 



Sowerby?). 

 Cycloceras '■'imhricatunV' {Orthoceras imhricatum Hall, not Wahlenberg). 



Wahlenberg's species is an Actinoceras, according to Foord. 

 Cycloraf suhulata {Murchisonia suhulata Hall pars, figure Ta only). 



