576 ALLIS. [Vor. XII. 
illae superioris of selachians (No. 125, p. 484). He finds the 
muscle, in Acipenser, innervated by a branch of the r. maxil- 
laris inferior trigemini arising from the still undivided trunk of 
the nerve (No. 125, p. 474). Stannius gives the same innerva- 
tion, but adds that the muscle contracts when the second root 
of the trigeminus is irritated, thus indicating that the nerve is 
a branch of the superior maxillary. In the one specimen that 
I examined the nerve arose from the upper surface of the 
truncus or ganglion of the trigeminus, and as there was no 
branch to other muscles or tissues, the muscle it innervated 
may correspond either to the first and second divisions of the 
levator maxillae superioris of Amia, or to the levator arcus 
palatini. The third and fourth divisions of the former muscle 
were represented by a tendinous, fatty, and degenerate muscle 
tissue extending from the cartilage below and in front of the 
eye to the under surface of the skin near the lower end of 
the hyomandibular. The r. maxillaris superior trigemini and 
the r. buccalis facialis of van Wijhe ran forward across the 
upper end of this tissue; the r. palatinus anterior facialis 
internal to it. 
In teleosts the levator arcus palatini and dilatator operculi 
do not differ greatly from the corresponding muscles in Amia. 
The levator maxillae superioris, on the contrary, has undergone 
great changes. In most teleosts all four divisions of it have 
been largely absorbed by the adductor mandibulae, but in 
being absorbed they have determined in many ways the 
arrangement and disposition of that muscle. In Esox part 
of the levator muscle is undoubtedly represented in the 
aberrant bundle A438, of Vetter. The tendon of another part 
has undoubtedly determined in Esox, and in Perca, Cyprinus, 
and Barbus as well, the insertion of A; at the hind end of 
Meckel’s cartilage, and in Perca another tendon persists as 
tendon Azt of Vetter. 
In Amiurus there are two tentacle muscles, the adductor 
and the abductor tentaculi (No. 75, p. 314). The adductor is 
either simply the first and second divisions of the levator max- 
illae superioris of Amia, or some or all of the divisions of that 
muscle and the muscle 43 combined. The abductor is described 
