580 
F. H. EDGEWORTH. 
bulae arises from the outer end of the inturned crista parotica 
and is inserted into the outer surface of the mandible. 
The intermandibularis (figs. 34-37) has spread behind the 
jaw as far back as the stylohyale, its anterior fibres — attached 
to tlie inner surface of MeckeTs cartilage in stage 47 — spread 
Fig. 65. 
up towards the outer edge of the (Monotreme) pterygoid bone ; 
the fibres next behind these are attached dorsally to the 
tympanic bone ; the most posterior fibres are not attached to 
the stylohyah The depressor mandibulm anterior is oblique 
in position, its inner end is more posterior than its outer, and 
is attached to dense connective tissue in front of the hyoid; 
the fibres pass outwards and forwards and are attached to the 
inner surface of the mandible. 
In a 4^ mm. embryo of the rabbit the Anlagen of the masti- 
