282 IOWA GEOLOGICAL SURVEY 



90. Dinichthys sp. Naples shale (Portage) ; Eighteen Mile 

 creek, New York. 



91. Dinomylostoma beecheri Eastman. Portage beds; Mt. 

 Morris, Livingston county, New York. Fragmentary remains, 

 doubtfully pertaining to the same genus, are known also from 

 the New Albany ( = Genesee) Black Shale near Louisville, 

 Kentucky. 



92. Glyptaspis abbreviata Eastman. Genesee shale of Eight- 

 een Mile creek, New York, and New Albany ( = Genesee) Black 

 Shale of Louisville, Kentucky. 



93. Aspidichthys sp. New Albany ( = Genesee) Black Shale; 

 Louisville, Kentucky. 



94. Callognathus serratus Newberry. Naples shale (Port- 

 age) ; Eighteen Mile creek, New York. Also typically in the 

 Huron and Cleveland shales of Ohio. 



CTENODIPTERINES. 



95. Dipterus ithacensis Williams. Ithaca beds (Portage) ; 

 Ithaca, New York. 



ACTINOPTERYGIANS. 



96. Rhadinichthys devonicus (Clarke). Genesee shale ; North 

 Evans, New York, and said to occur also in the corresponding 

 formation of Kentucky. Similar scales also obtained by J. M. 

 Clarke from the Naples shale (Portage) of Sparta, New York. 



97. Rhadinichthys antiquus Williams. Naples shale (Port- 

 age) ; Eighteen Mile creek, New York. 



98. Rhadinichthys reticidatus Williams. Naples shale (Port- 

 age) ; Eighteen Mile creek, New York. 



Ohio Shale (Huron, Erie and Cleveland shales) ; Ohio and 



Kentucky. 



ELASMOBRANCHS. 



99. Phcebodus politus Newberry. Cleveland shale; Lorain 

 county, Ohio. 



100. Cladodus claypolei Hay. Cleveland shale; Rocky river, 

 Ohio. 



