216 



F. H. EDGEWORTH. 



the liinder part gaius an attacliment to the first branchial 

 bar.i 



Scliultze described the hyoid muscles of the larvae of 

 Pelobates fuscus as consisting of an orbito-hyoideus, sus- 

 pensorio-hyoideus, cerato- hyo-angularis, quadrato-angularis, 



Text-fig. 44 



Text-figs. 44 and 45. — Ceratodus, embryo stage 46 ; longitudinal 

 horizontal section.s. Text-fig. 44 is the more dorsal ; the left 

 side of the sections is slightly dorsal to the right side. 



and suspensorio-angularis. In Raua the myotome of the 

 hyoid segment separates from the interhyoideus in 6 nnn. 

 embryos. It divides in 7 mm. embryos into an upper and lower 

 poi'tion (Text-fig. 58) ; the former develops into the orbito- 

 hyoideus, which passes from the processus muscularis of the 



' First interhranchial of Drilner. 



