XI.] 



AKTIODACTYI.A. 



193 



sagittal suture. The frontals (Fr) are large, and usually 

 (except in some domestic races) develop from their outer 

 surface conical, curved, bony processes, cancellous within, 



* 



FIG. 62 Longitudinal and vertical section of skull of a Sheep (Otn's artts), i. 

 I'Mt premaxilla ; MT roaxillo-turbinal ; Na nasal; E'J' ethmolurbinal ; ME 

 mcsethinoid ; hr frontal ; OS orbitosphenoid : AS alisphenoid ; t'a parietal : 

 SO supraoccipital ; Per periotic ; ExO exoccipital ; BO basioccipital ; fp par- 

 occipital process ; Ty styhform process of tympanic; US basisphenoid ; PS pre- 

 sphenoid ; Pt pter>'goid ; /'/ palatine ; Vo vomer ; MX maxilla ; cp coronoid 

 process ; rd condyle ; s symphysis of mandible ; sA stylohyal ; eh epihyal ck 

 ccratohyal ; M basihyal; th thyrohyal. 



which are called the " horn cores," as they form the internal 

 support of the true horns. The nasals (Na) are long and 

 pointed in front. The premaxillse (PMx) are slender, with 



