PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
EXPLANATION OF PLATE XXV. 
Fig. i. Mytilus cf. chorus Mol. ........ 
i a. Fragment of cast from Patagonian beds of Upper Rio Chalia. 
ib. Not quite complete cast from Cape Fairweather beds, Cape 
Fairweather. 
Fig. 2. Modiola ameghinoi v. Ih. 
Patagonian beds ; Mount of Observation, upper horizon. 
Left valve. 
Fig- 3 - Arca patagonica v. Ih. 
Patagonian beds ; mouth of Santa Cruz River. 
3«. Outer view of right valve of a specimen of small size. 
3b. Cardinal view of the same, showing area. 
Fig. 4. CUCULLEA ALTA Sow. ......... 
Patagonian beds. 
4 a. Outer view of left valve of medium size ; Mount of Observa- 
tion, lower horizon. 
4 b. Inner view of hinge of the same. 
4 c. Cardinal view of a large individual, showing both valves. 
Mouth of Santa Cruz River. 
Fig. 5. Cucullzea (Cucullaria) darwini (Phil.) 
Patagonian beds ; mouth of Santa Cruz River. 
5 a. Outer view of left valve. 
5^. Details of surface sculpture, enlarged. 
Fig. 6. Limopsis insolita (Sow.) 
Patagonian beds ; mouth of Santa Cruz River. 
Inner view of left valve. 
Fig. 7. Nucula patagonica Phil. 
Patagonian beds ; mouth of Santa Cruz River. 
7«. Outer view of right valve. 
7b. Inner view of right valve of another individual. 
Fig. 8. Nucula reticularis Ortm. . 
Patagonian beds ; mouth of Santa Cruz River. 
8 a. Right valve, natural size. 
8 b. The same, 4/1. 
All of the figures, unless otherwise stated, are natural size. 
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