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 vertebre. 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 vertebre, seems to favour this view. 
GUELPH, June 3rd, 1884. 
