No. i8.] 



TRIASSIC FISHES OF CONNECTICUT. 



IS 



Although forming the dominant feature of Silurian verte- 

 brate life, Ostracophores are nevertheless accompanied in the 



J.J/I, 



Fig 2. Outlines of Acanthodian Fishes, illustrating their 

 gradual elongation in shape and loss of intermediate spines during 

 successive periods. A, Climatius scutiger Egerton. Lower Old Red 

 Sandstone; Scotland. B, Mesacanthus mttchelh (Egerton). Ibid. 

 C Acanthodes sulcatus Agassiz. Lower Carboniferous; Edin- 

 burgh D, Acanthodes gracilis. Roemer. Lower Permian; 

 Bohemia a. anal fin; d, dorsal fin; t. sp., intermediate spines; 

 p, pectoral fins. (From Smith Woodward, partly after Traquair 

 and Fritsch.) 



