PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XXV. 



PAGE 



Fig. i. MYTILUS cf. CHORUS Mol. . . . . . . . . 120 



la. Fragment of cast from Patagonian beds of Upper Rio Chalia. 

 ib. Not quite complete cast from Cape Fairweather beds, Cape 

 Fairweather. 



Fig. 2. MODIOLA AMEGHINQI V. Ih. . . . . . . . . 12 1 



Patagonian beds ; Mount of Observation, upper horizon. 



Left valve. 



Fig. 3. ARCA PATAGONICA v. Ih. 93 



Patagonian beds ; mouth of Santa Cruz River. 



30. Outer view of right valve of a specimen of small size. 



3<J. Cardinal view of the same, showing area. 



Fig. 4. CUCULL^EA ALTA Sow. ....... . 86 



Patagonian beds. 



4. Outer view of left valve of medium size ; Mount of Observa- 

 tion, lower horizon. 

 4<$. Inner view of hinge of the same. 

 ty. Cardinal view of a large individual, showing both valves. 



Mouth of Santa Cruz River. 



Fig. 5. CUCULL^EA (CUCULLARIA) DARWINI (Phil.) .... 90 



Patagonian beds ; mouth of Santa Cruz River. 

 5#. Outer view of left valve. 

 $b. Details of surface sculpture, enlarged. 



Fig. 6. LIMOPSIS INSOLITA (Sow.) . 91 



Patagonian beds ; mouth of Santa Cruz River. 



Inner view of left valve. 



Fig. 7. NUCULA PATAGONICA Phil. . 80 



Patagonian beds ; mouth of Santa Cruz River. 

 7#. Outer view of right valve. 



7& Inner view of right valve of another individual. 



Fig. 8. NUCULA RETICULARIS Ortm. ... 8 2 



Patagonian beds ; mouth of Santa Cruz River. 

 8a. Right valve, natural size. 

 86. The same, 4/1. 



All of the figures, unless otherwise stated, are natural size. 



(VOL. iv) 



