THE MYOLOGY OF AMIURUS CATUS. 351 



As regards the trapezius, I cannot state positively whether it 

 should come in the first or second column of the table, and with 

 regard to how far the muscles on the dorsal region immediately 

 behind the skull correspond to the supracarinales and muscles of the 

 dorsal fin, I am equally uncertain. It is probable that the muscles 

 corresponding to these portions have, in the anterior spinal region, 

 completely disappeared, in consequence of the specialization of the 

 anterior vertebrae. The fact that the erector of the second spine of 

 the dorsal fin is attached to the base of the fourth spinous process, 

 and this on its part is united with the posterior wall of the skull 

 closing in above the other vertebrae, seems to favour this view. 



Gcelph, June 3rd, 188-L 



