532 



F. H. EDGEWORTH. 



Lizards, e. g. Hemidactyhis, Gepliyra, Yaranus, some of the 

 fibi'es are inserted into the quadrate (Fiirbringer). 



In ChamEeleon there is no depressor palpebr^ inferioris 

 developed, and the whole of the upper part of the myotome, 

 after a temporary insertion into the pterygoid process, be- 

 comes divided into the pterygo-splienoidalis anterior, pterygo- 

 parietalis,^ and protractor pterygoidei;^ of these the first and 

 third arise from the processus anterior inferior and adjacent 

 parts of the otic capsule; the second from the parietal bone. 



In Tropidonotus there is also no depressor palpebr^e infe- 



dap palp inf 



29. 

 retract oc 



/Jexf. 



OtOSph.pl 



Sfihen.pter quad- / 



/ epipter. 



of /7Jy/o 



/ ptyexC 

 cer hyal c fiyoy/oss."' Bn/. 



gen hyoid 



hyoid. 



Text-fig. 29. — Sagittal section through an emhryo of Sphen- 

 odon, in "stage S" of Howes and Swinnerton. (For exphina- 

 tion of lettering see p. 555.) 



rioris, and the upper part of the myotome, after a temporary 

 insertion into the pterygoid process (text-fig. 37, p. 543), 

 becomes divided into the vomero-sphenoideus, pterygo- 

 sphenoidalis anterior, pterygo-parietalis, and pterygo- 

 sphenoidalis posterior. 



In the Lacertilia vera and Ophidia the quadrate — after 

 separation or atrophy of its pterygoid process — is movable; 



' Of Versluys. Bradley states that these muscles are absent in the adult. 

 The condition in my embryos (one of which is fairly advanced in develop- 

 ment) supports the opinion of Versluys ; they also show that a pterygo- 

 sphenoidalis anterior is present. 



