No. 601] SHOBTEB ARTICLES AND DISCUSSION 63 



and of Pterothrissus. His 0. divaricatus is wholly distinct from 

 the scale described by Geinitz under that name, and has not the 

 Albulid characters. The Beryx ornatus scales are printed up- 

 side down, and the artist has added ctenoid structures (small 

 teeth) above, on what is really the basal margin. In 1874 T. C. 

 Winkler published a paper^ in which he described two species 

 from the scales. His Osmeroides helgicus appears to be con- 

 generic with the Osmeroides lewesiensis as understood by Fritsch. 

 His Cycloides incisits, supposed new genus and species, of which 

 he says that he knows no fish, living or fossil, with such scales, is 

 apparently worthless. It may not be a fish-scale. In America 

 the fossil scales of Teleosts have received very little attention, 

 but a large collection accumulated by the U. S. Geological Survey 

 is now under review, and will undoubtedly yield much of value 

 for the understanding of Mesozoic fishes, and at the same time 

 throw light on the ancestry and relationships of modern families. 



T. D. A. COCKERELL 



Univebsity of Colorado, Boulder, 

 July 8, 1916 



Mus. Teyler., lY. ^ ^ ^ ' ° ^ ^jsteme heersien. 



