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 S29 o5) 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 Fi ue P 
plate generally measures about 28 Fig. 131. A, movable plate; B and 
mm. long by 10 mm. wide, and has tralaze "PY" aa es 
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 
