457 Costa Rica Miocene — Olsson 285 



Page 



15. Tellina umbra Dall, East Grape Point Creek, enlarged about 



T,}4 times 253 



16. Macoma costaricana, n. sp., Banana River, about natural size 256 



17. Tellina nasua, n. sp., Red Cliff Creek, about natural size 250 



18. Strigilla musanica, n. sp. , Banana River, length 13 mm 255 



19-20. Venericardia Conradiana Gabb, variety limonensis, n. var. , 



Port Limon, length 7 mm 217 



21. Chione grus Holmes, variety, Red Cliff Creek, enlarged about 



4 times 248 



22. Cardita caribbeanensis, n sp., Banana River, length 18 mm.. 214 

 23-24. Limopsis monilis, n. sp,. Old Man Sam Creek, length 1.75 



mm 177 



PI.ATE 27 (30) 



Fig. I, Cardium spinosum Meuschen, var. Turtoni Dall, Port Limon 



about natural size 228 



2. Cardium dominicense Gabb, East Grape Point Creek, slight- 



ly reduced 225 



3. Cardium costaricauum, n.sp.. East Grape Point Creek height 



24 mm 226 



4-5. Cardium stiriatum Brown and Pilsbry, Banana River, slight- 

 ly reduced 225 



6. Cardium medium Linne, Port Limon, about natural size 226 



7. Protocardia gurabica Maury, Gatun, length 29 mm 229 



8. Protocardica gurabica Maury, Water Cay, length 25 mm. 



9. Protocardia gurabica Maury, Water Cay, diameter 19 mm. 



10. Cardium heredium, n. sp. , Rio Betey, length 11.50 mm 227 



11-12. Cardium serratum Linne, Middle Creek, natural size 228 



13. Protocardia costaricensis, n. sp. , Comadre Creek, length 21 



mm 229 



PLATE 28 (31) 



Fig. I 

 2 



3 

 4 



Mactra estrellana, n. sp , Estrella River, length 50 mm 263 



Mactra exoleta Gray, Boucary Creek, about natural size 262 



Mactra alata Spengler, Banana River, about natural size 263 



Mactra sincola, n. sp.. Saury Creek, length 36 mm 264 



Echinochama yaquensis Maury, Old Harbor 219 



