SPECIAL WORK* 
Mamm. 51 
same group as the Plagiaulacidce ( Multituberculata ). Some of these have 
been previously named, while others are new. Several differences from 
the typical Multituberculata (such as a variation in the number of the 
teeth) are pointed out, but these are not considered of sufficient import- 
ance to separate them from the group, which is placed among the 
Diprotodont Marsupials. A general account is given of the typical 
Multituberculata. ( Vide infra.') 
Abderitidju. 
^iDijrilus spegazzinii , n. g. & sp., F. Ameghino, t. c. pp. 153-155, figs. 5 
& 6, Tertiary, Patagonia. Also figured by Trouessart ( vide supra, 
p. I?). 
tgif n. sp., Ameghino, t. c. p. 155, fig. 7, ibid, 
osborni, n. g. & sp., Ameghino, t. c. pp. 155 & 156, Tertiary, 
Argentina. 
t Epanorihus holmbergi, n. sp., Ameghino, t. c. p. 157, fig. 8, ibid. 
& f Tideus trisulcatus , n. g. & sp., Ameghino, t. c. p. 157, ibid. 
HDipilus be 
t Pichipilus 
