622 ME. p. OHALMEES MITCHELL ON THE [June 16, 



muscle, which spreads anteriorly and posteriorly over the lower 

 surface of the space between the jaws, reaching forwards nearly to 

 the posterior border of the mylohyoid untenor, and meeting its 

 fellow from the other side in the middle line. The anterior or 

 deeper division of the mylohyoid posterior has its origin partly in 



Fig. 2. 



Dissectiou of hyoidean muBclea of Opistkocoinus cristatus. 



1. Geniohyoid, posterior division. 2. Geniohyoid, anterior division. 3. Mylo- 

 hyoid anterior. 4. Mylohyoid posterior, po.sterior division. 5. Mylohyoid 

 posterior, anterior division. 6. Ceratoglossus. 7. Ceralohyoid. 8. Depressor 

 niandibulsB. Gl., Mandibular gland. 



common with the foregoing division, but also extending a consider- 

 able distance over the inner surface of the ramus, a condition that 

 I have not found in any other bird. In the Pheas/ints the origin 

 is normal, a narrow nearly vertical line in front of the depressor 

 mandibulce attachment. 



