SKELETAL MUSCULATURE OF THE KING SALMON. 



45 



the lateralis superficialis forms a similar attachment into the connective tissue over 

 the bases of the first and second long ventral caudal rays. 



THE TERMINAL OR CAUDAL PORTION OF THE MUSCULUS L.-VTERALIS PROFUNDUS. 



The terminal or caudal portion of the profundus is characterized by the excessive 

 proportion of connective tissue of the myocommata. In fact the myocommata are 

 finally reduced to tendons of insertion. 



The epaxial and hypaxial portions are well separated in the region of the caudal 

 peduncle, partly by the greater development of the superficialis which ensheathes the 



Fic. 5. — The superficial muscles of the caudal fin and the caudal peduncle. L. s., lateralis superficialis; D. s., dorsal slip of 

 lateralis superficialis; I', s., ventral slip of lateralis superficialis; D. /., dorsal tendon of lateralis superficialis; V. i., ventral ten- 

 don of lateralis superficialis, L. p., lateralis profundus; /.. terminal tendons of the lateralis profundus; Int. c, interfilamenti 

 caudalis. 



profundus next the septum. The final terminal tendons run straight back under the 

 clavate margin of the tendon of the superficialis to a very strong insertion into the 

 aponurosis which covers the bases of the rays of both the dorsal and the ventral lobes 

 and includes all of the intermediate series (fig. 5). 

 19371°— vol 33—15 1 



