256 



WR. Cr. P. MUDGE ON THE MYOLOGY 



In Prionittinis (icxt-fifj:. 3 6, p. 2('>{)) the styloliyoiduus {,iL/i.} is tendinous at its 

 insertion, and it is inserted in common with a branch of the sternohyoideus, with 

 whicli it becomes confluent just before its insertion. In Strinf/ops (PL XXVII. 

 fig. 18) the stylohyoideus divides into two some distance before reaching its insertion ; 

 the posterior branch is inserted at the usual position on the parahyal process, while the 

 anterior one passes towards the middle line and becomes confluent with the internal 



twig {ih.g}) of the thyroglossus. 



Text-figure 14. 



Lorius Jlavo-palliaius. — Ventral view. On the left the serpihyoideus has been removed, to show the cerato- 

 hyoideus {cJi.) and sternohyoideus (sJi.) and the course of the geniohyoideus {yh.a. and gh.p.). Other 

 letters as before. (Twice nat. size.) 



In Prioniturus, Chrysotis, BoUorhyndms, and Calopsiftacus the uro-hypobranchial 

 tendon arises directly from the sheath investing the urohyal, as the nodule (N.) that 

 articulates with the ventral surface of that in other Parrots is absent. 



A general review of the facts concerning this muscle (posterior mylohyoideus) 

 indicates that its two constituent portions have arisen from a common muscle, since in 

 some Parrots the stylo- and serpihyoideus are confluent along the greater portion of 

 their course, and a gradual separation of the two can be traced. The stylohyoideus 



