PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XXVIII. 



PAGE 



Fig. I. VENUS DIFFICILIS Ortm. 135 



Magellanian beds ; Punta Arenas. 



i a. Left valve (of double shell), interior view, showing hinge. 



Lower Magellanian beds. 



\b. Cardinal view of both valves of the same individual. 

 ic. Outer view of a left valve. Upper Magellanian beds. 

 Fig. 2. VENUS ARENOSA Ortm. ........ .136 



Upper Magellanian beds ; Punta Arenas. 

 za. Outer view of right valve. 

 26. Hinge of the same. 

 Fig. 3. VENUS VOLCKMANNI Phil. . . . . . . . . 139 



Patagonian beds ; mouth of Santa Cruz River. 



3#. Outer view of a left valve of a double individual. 

 T,b. Cardinal view of both valves of the same. 

 Fig. 4. VENUS DARWINI Phil. ......... 140 



Patagonian beds ; mouth of Santa Cruz River. 



Outer view. 

 Fig. 5. MERETRIX IHERINGI Cossm. . . . . . . . 142 



Patagonian beds ; Punta Arenas. 



5#. Outer view of fragment of left valve. 

 b. Hinge of the same. 

 Fig. 6. MERETRIX ROSTRATA (Kch.). . . . . . . . 143 



Cape Fairweather beds ; Cape Fairweather. 



Cast of left valve, with fragments of shell remaining. 

 Fig. 7. DOSINIA L^VIUSCULA (Phil.). . . . . . . . 147 



Patagonian beds ; mouth of Santa Cruz River. 



Outer view of left valve. 

 Fig. 8. TELLINA JEGUAENSIS v. Ih. . . . . . . . . 148 



Patagonian beds ; Arroyo Gio. 

 Cast of left valve. 



All the figures are natural size. 



(VOL. iv) 



