ORDER II 



MAESUPIALIA 



27 



Family 1. Oaenolestidae Trouessart. 



(Paucituberculata Anieghino.) 



Small or moderate-sized marsupials with three to four small vertical upper I and 

 a large, lower I, horizontally placed. Behind are three to four simple, pointed teeth, 

 of ivhich one in the upper jaw often becomes a strong C. Upper F^ and P^ small, 

 F^ larger and with cutting edge, as are also the two lower P. M quadricuspidate, 

 decreasing in size backwards. Lotoer M-^ frequently enlarged, with five cusps and 

 functioning, together with F^, as a pair of scissois. The remaining M are quadri- 

 tubercular and lophodont. Upper M with weak, secondary inner cusp. P'eet not 

 syndactylous. Recent and fossil in South America. 



Subfamily 1. Caenolestinae. 

 No F or M developed as cutting teeth. 

 P and M very like those of Didelphys. 

 Caenolestes Thomas. Living in Ecuador. 



4.I.3.4. 

 1.0.4-5.4. 



sectorial tooth. 



Lower M is a tubercido- 



Garzonia {Fig. 39, A) and Hahnarhiphus Ameghino from the Miocene of Santa 

 Cruz ; the former genus with 

 tritubercular upper M. 



Stilotherium (Fig. 39 _B) and 

 Cladoclinus Ameghino (Pithecidites, 

 Clenialites Ameghino). Miocene 



or r^^tficyomfl 



O ■ _ A, Garzonia typica Amegliino. Miocene of Santa Cruz. 



ZyqolesteS Ame^'hinO. Plio- Upper M., inferior and rear aspect, '^jo. B, Stilotherium 

 T. 1 1 * !■ A • dissimile Ameghino. Same locality. Lower jaw, i/j. (After 



cene. rarana beds oi Argentina. Ameghino.) 



Subfamily 2. Palaeothentikae. 



n.3.4. 



. Upjm- P"^ and lower M^ together form scissors. In the lower jaw 



behind I are three to four small intermediate teeth. Skull, more especially the 



occiput, is very broad. Zygomatic arch very prominent. 



Falaeothentes Moreno 

 (Fig. 40). Epanorthus, 

 Metaepanorthus *(Fig. 41), 



Fig. 40. 



A, PalrMoihentes intermedins Ame- 

 ghino. Upper molars. B,P.'ininutus 

 Am. Lower molars. Upper Miocene 

 of Santa Cruz. s/o. (After Sinclair.) 



.^^^^3^1:^0^ 



Fig. 41. 



Metc.wpanorthus holmhergi 

 Ameghino. ^, Exterior aspect 

 of upper tooth row. B, In- 

 ferior aspect of same, 2/j. 

 Upper Miocene of Santa Cruz, 

 Patagonia. 



Fig. 42. 



Paraepanorthus minutus Ameghino. 

 Exterior aspect of skull and lower 

 jaw. i/i. Upper Miocene of Santa 

 Cruz, Patagonia. 



Paraepanorthus (Fig. 42) Ameghino. All M nearly uniform in size. P robust. 

 Callomenus (Fig. 43), Decastis, Acdestis Ameghino. Miocene of Patagonia. 31 of 



