MORPHOLOGY OF CEANIAL MUSCLES IX SOME VERTEBRATES. 265 



from the second branchial pharyngeal constrictor; this con- 

 firms the opinion of Fiirbringer. 



The phaiyuo'eal musculature extends forwards into the 

 mandibular segment in 13 mm. embryos (Text-fig. 94) ; in 

 14 mm. embryos the anterior end becomes separated, forming 

 the tensor palati, and in 16 mm. embryos the next succeeding 

 portion forms the levator palati. 



Text-fig. 73. 



1 VL - r<^*-^. 



Vvi^jjoK- jIj.' 



73. 



According to Futamura, as stated above, the Anlage of the 

 palatal muscles of man is at first one with that of the tensor 

 tympanij and is derived from the platysma faciei. I have 

 failed in verifying this in the rabbit; the platysma faciei in 

 that animal remains superficial, and the Anlage of the 

 palatal muscles when first visible was quite distinct from 

 that of the tensor tympani, which is cut off from the inner 

 limb of mandibular myotome. 



