PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
EXPLANATION OF PLATE XXIV. 
Fig. i. Pecten actinodes Sow. . . . . . . . ' . 
Cape Fairweather beds ; Cape Fairweather. 
la. Right valve. 
ib. Left valve of another individual. 
Fig. 2. Perna quadrisulcata v. Ih. 
Patagonian beds. 
2 a. Hinge of right valve. Mouth of Santa Cruz River. 
2 b. Cast of an almost complete specimen. Lake Pueyrredon, 
base. 
Fig. 3. Mytilus magellanicus Chemn. . ...... 
Patagonian beds ; Oven Point, San Julian. 
Inner and outer casts, imbedded in matrix. 
Fig. 4. Modiola andina Ortm. ........ 
Patagonian beds ; Lake Pueyrredon, 400' above base. 
Cast. 
All the figures are natural size. 
PAGE 
II 9 
97 
1 2 1 
122 
(VOL. IV) 
