526 



ZOOLOGY 



SECT. 



sternal ends, are ossified, and articulate with the sternum by means 

 of well-developed synovial articulations. In tlie 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 



^Y par 



S.OC 



ea:^.oc 



Fio. 1137. — Skull of Armadillo {Dns:ypus sexcinctus.) Letters as in Figs. 1132 — 1134. In 



addition, peri, periotic. 



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 skidl (Fig. 1137) is broad and flat, the 

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

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

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



par" 



cTr 



S.OC 



CO net \ 

 al.sph ' ejct.atui 



cor 



Fki. 1138. — Skull of Anteater (Mi/rmecophafia), lateral view. al. sph. alispheno'd ; cond. condyle 

 of niaudililc ; cor. coronoid process of niaiidible ; e.r. oc. exoccipital ; e.ct. ihiid. external 

 auditory meatus ; fr. frontal ; ju. jugal ; Icr. laerymal ; max. rnaxilla ; nas. nasal ; occ. road. 

 occiijital condyle ; put. palatine ; par. parietal ; p. max. premaxilla ; s.oc. supraoccipital ; 

 sq. squamosal ; f>/. tympanic. 



develop palatine plates. The mandible has a well-developed 

 ramus with a prominent coronoid process and a well-marked 

 angular process. 



In the American Anteaters (Figs. 1188 and 1139) the skull is 

 extremely long and narrow — the facial region being drawn out into 



