PROEUTATUS 



199 



The genus is distinguished by thick, relatively long and 

 narrow, movable plates, each overlapped by about a third 

 of its length. The plates of the pelvic buckler are shorter 

 and thicker, the exposed surface of each being ornamented 

 by a figure compared by Ameghino to a flask (see fig. 131), 

 which figure is more distinct on the rear, fading away 

 toward the front. On the plates of the pelvic buckler 

 this figure is more accentuated, and from it, on either side, 

 radiate two furrows dividing the surface into several (4 to 

 5) areas. The entire surface of each plate is irregularly 

 punctate. 



Proeutatus lagenaformis Ameghino 



P. sp? Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 660. 



P. lagenaformis Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 507. 



On the Chico del Chubut River, west of Puerto Visser, 

 we found nine specimens of this species, all fragmentary, 

 though one consists of over fifty 

 more or less broken plates, mostly 

 from the pelvic buckler. This is 

 the only species of the genus from 

 the Deseado, and corresponds to 

 the description above. A movable _P 



plate generally measures about 28 F i g . 131. A , movable P iate ; Band 



II i * i C, plates from pelvic buckler nat- 



mm. long by 10 mm. wide, and has urai T size. 



four large piliferous pits on the posterior margin. A plate 



of the pelvic buckler varies greatly in size, but is always 



thick and has two to eight piliferous holes on the posterior 



margin. A typical plate measures 20 mm. long by 10 mm. 



wide. 



Prozaedius Ameghino 



Zaedius Amegh., in part, 1889, Act. Acad. Nac. Cordoba, t. 5, p. 867. 

 Prozaedius Amegh., 1891, Revista Argen. Hist. Nat., t. I, p. 327. 

 Dasypus Lydekker, in part, 1894, Anal. Mus. La Plata, t. 3, p. 55. 

 Prozaedius Scott, 1903-5, Reports Princeton Patagonian Exp., vol. 5, p. 69. 



Of this little genus, which is so strikingly like the living 

 Zaedius , we found a carapace with ten rows of movable 



f 



