98 



EDENTATA 



ORDER V 



in transverse rows. Caudal sheath composed of seven movable rings, and a 

 tube of four fused rings, distal rows in each ring slightly elevated. Pliocene 

 of Texas. 



Propalaeohoplophorus Ameghino. Premaxillaries with vestigial teeth. 



Fig. 121. 

 Glyptodon reticulatxis Owen. Pampas formation, Argentina. 



A, Molars of the upper jaw. 



B, Molars of the lower jaw. 



C, Portion of tail. i/l2- 



D, A tail vertebra with enclosing armour-plates, i/g. 



Anterior premolars simple cylinders. Sacrum composed of seven or eight 

 vertebrae. Pubis small, cross-bar small or absent. Manus and pes with five 

 digits. Head shield plates separate. Carapace small, without marked anterior 

 latei'al prolongation. Plates in transverse rows. Caudal sheath composed of 

 five or six rings and a terminal tube of two rings closed by a single plate. 

 Miocene of Santa Cruz, Patagonia. 



Cochlops Amegh. Skull and teeth similar to Propalaeohoplophorus. Head 

 shield plates separate but smaller, thicker and more numerous than in Pro- 

 'palaeoho'plophonis. Carapace small, plates rough and punctate, with a wide 

 transverse band near the middle, and some over pelvis tuberculate. Miocene 

 of Santa Cruz, Patagonia. 



Eucinepeltus Amegh. Head shield composed of eleven to fifteen plates 

 co-ossified, with suture lines raised and no sculptural pattern. Carapace 

 medium-sized with plates marked as in Propalaeohoplophorus, but with central 

 figure not elevated and border plates nonserrate. Miocene of Santa 

 Cruz, Patagonia. 



Neoihoracophorus Amegh. Anterior premolar of lower jaw small and 

 conical. Carapace medium-sized. Plates small, thick and united by tissue, 

 only the central elevated figure surrounded by plane surface. Caudal sheath 

 composed of rings as in Glyptodon. Pleistocene of Argentina. 



