PLATE XVII. 
Fig. V>l " P 
1. Tetragomopterus avus, A. 8. Woodw. ; right lateral aspect. 
— Tertiary Lignite ; Taubate, San Paulo, Brazil. 
[P. 9222.] 298 
2. Tetragonopterus ligniticus, A. S. Woodw. : right lateral 
aspect.— Ibid. ' [P. 9012.] 2" 
3. Ditto: left lateral aspect. — Ibid. [P.9226.] — 
4. Arias ihervngi, A. S. Woodw. ; skull, superior aspect. — 
Ibid. [P. 9220.] 334 
5. Perdehthys antiquus, A. S. Woodw.; dorsal portion of 
trunk, right lateral aspect.— Ibid. [P. 9011.] 514 
