453 



Costa Rica Miocene — Olsson 



281 



6-7 



8. 



9. 

 10. 

 II. 

 12. 



13- 



14. 



15. 

 16. 



17. 

 18. 



19- 

 20. 



21-2 

 25- 



Fig. I. 



3-4 

 5- 



6-7- 



Page 



Glycymeris canalis Brown and Pilsbry, Banana River, about 



natural size 177 



Glycymeris canalis Brown and Pilsbry, variety, East Grape 



Point Creek , 177 



Glycymeris canalis Brown and Pilsbry, variety. East Grape 



Point Creek 177 



• Glycymeris canalis Brown and Pilsbry, Banana River 177 



Pecten costaricensis.n. sp.. Red Cliff Creek, right valve 201 



Pecten costaricensis, n. sp., Red Cliff Creek, left valve. 

 Pecten costaricensis, n. sp.. Red Cliff Creek, right valve. 

 Pecten costaricensis, n. sp.. Red Cliff Creek, left valve. 



Leda ensinoides, n. sp.. Banana River, length 54 mm 174 



Glycymeris castaneus Lamarck, Banana River, length 30 mm. 180 

 Glycj^meris castaneus lyamarck. Banana River, length 23 mm. 



Leda Balboee Brown and Pilsbry, Banana River, enlarged 173 



Pecten almirantensis, n. sp., Bocasdel Toro,heigth 4.75 mm. 203 



Pecten aotus, n. sp.. Port Limon, height 4.50 mim 204 



Pecten aotus, n. sp., Port Limon, 4.75 mm. 



Leda quitanensis, n. sp., Quitana Creek, length 26 mm 174 



Leda Davilse, n. sp. , Bocas del Toro, length 5.75 mm 173 



2-23-24. Nucula cahuitensis, n. sp., Saury, length 3.50 mm 171 



Nucula tenuisculpta f^abb, Red Cliff Creek, length 4.00 mm. 172 



PLATE 19 (22) 



Glycymeris carbasina Brown and Pilsbr)-, East Grape Point 



Creek, about natural size 179 



Glycymeris carbasina Brown and Pilsbry, same locality, 



about natural size 179 



. Glj-cymeris jamaicensis, Red Cliff Creek, about natural size 178 



Glycymeris carbasina Brown and Pilsbry, East Grape Point 

 Creek, small shell about natural 

 size 179 



Glycymeris decussatus Lamarck, Old Man Sam Creek, nat- 

 ural size .. 180 



PLA'IE 20 (23) 



Fig. I. Spondylus chiriquiensis, n. sp.. Water Cay, height 151 mm... 206 



2. Spondylus chiriquiensis, n. sp., young shell to show the small 



foliaceous attachment area. 



3. Thracia Tristani, n. sp., Rio Betey, length 42 mm 211 



