286 IOWA GEOLOGICAL SURVEY 



ELASMOBRANCHS. 



147. Cladodus formosus Hay. Ouray limestone; Needles 

 Mountain, Colorado. 



148. Diplodus priscus Eastman. Upper Devonian; Elm- 

 hurst, Illinois. 



149. Diplodus striatus Eastman. Upper Devonian; Elm- 

 hurst, Illinois. 



150. Diplodus sp. ind. Upper Devonian; Elmhurst, Illinois. 



151. Ptyctodus calceolus Newb. & W. Upper Devonian; 

 Elmhurst, Illinois. Also State Quarry, Lime Creek and Sweet- 

 land Creek beds, Iowa. 



152. Ptyctodus compressus Eastman. State Quarry beds; 

 Johnson county, Iowa. 



153. Ptyctodus ferox Eastman. State Quarry beds; John- 

 son county, Iowa. 



ARTHRODIRES. 



154. Dinichthys pustulosus Eastman. State Quarry beds; 

 Johnson county, Iowa. 



155. Dinichthys (?) tuberculatus Newberry. State Quarry 

 beds; Johnson county, Iowa. 



156. Arthrodire fragments, mostly of dermal armor. Elbert 

 formation; Devon Point, southwestern Colorado. 



CTENODIPTERINES. 



157. Dipterus costatus Eastman. State Quarry beds; John- 

 son county, Iowa. 



158. Dipterus digitatus Eastman. State Quarry beds ; John- 

 son county, Iowa. 



159. Dipterus mordax Eastman. State Quarry beds; John- 

 son county, Iowa. 



160. Dipterus pectinatus Eastman. State Quarry beds; 

 Johnson county, Iowa. 



160a. Conchodus variabilis Eastman. State Quarry beds; 

 Johnson county, Iowa. 



161. Synthetodus trisulcatus Eastman. State Quarry beds 

 and Sweetland Creek beds; Johnson and Muscatine counties, 

 Iowa. 



