494 



ZOOLOGY 



SECT. 



of well-developed synovial articulations. In the American Ant- 

 eaters there are similar synovial joints, and the sternal ends of the 

 sternal ribs are completely bifid. In the Sloths the sternum is 

 long and narrow, and there are no synovial joints. In front the 

 sternal ribs are ossified and completely united with the vertebral 

 ribs, but behind they are separated from the latter by intermediate 

 ribs which are less perfectly ossified. 



In the Armadillos the skull (Fig. 1068) is broad and flat, the 

 facial region triangular. The tympanic (ty.} is in some developed 



par 



nets 



s.oc 



oc 



FIG. 1068. Skull of Armadillo (Dasypus sexcinctus). Letters as in Fig. 1063. In addition 

 peri, periotic ; ty. tympanic. 



into a bulla. The bony auditory meatus is in some cases elongated. 

 The zygoma is complete. The pterygoids are small, and do not 

 develop palatine plates. The mandible has a well-developed 

 ramus with a prominent coronoid process and a well-marked 

 angular process. 



In the Anteaters (Figs. 1069 and 1070) the skull is extremely 

 long and narrow the facial region being drawn out into a long 



pai 



occ.concL 



pal I al.sph ' 



FIG.' 1069. Skull of Anteater (Mynnecoplmga), lateral view, al.sph, alisphenoid ; cond. condyle 

 of mandible ; cor. coronoid process of mandible ; ex. oc. ex-occipital ; ext. and. external 

 auditory meatus ; jr. frontal -; ju. jugal ; Icr. lacrymal ; max. maxilla ; nas. nasal ; occ. cowl. 

 occipital condyle ; pal. palatine ; par. parietal ; p.max. pre-maxilla ; s.oc. supra-occipital ; 

 sq. squamosal ; ty. tympanic. 



narrow rostrum, with the external nares at its extremity. The 

 olfactory fossae are greatly developed. The rostrum is composed 



