288 Bulletin 39 460 



Page 



9. Pitaria cireinata Born, Saury Creek, about natural size 236 



10. Pitaria boucaryensis, n. sp. , Boucary Creek, about natural 



size 239 



ir. Pitaria Guppyana Gabb, Port L,imon, about natural size 237 



PLATE 32 (35) 



Fig. I. Callocardia gatunensis Dall, Banana River, about natural 



size 235 



2-3. Pitaria VanWinklese, n. sp.. Banana River, about natural 



size 238 



4. Chione costaricensis, n. sp., Banana River, length 34 mm 245 



5. Phacoides costaricensis, n. sp. , Middle Creek, length 11.50 



mm 222 



6. Phacoides bocasensis, n. sp., Bocas del Toro, length 10.00 



mm 223 



7. Chione hotelensis, n. sp.. Hotel Creek, slightly reduced 247 



8. Cardita matima, n. sp. , Old Man Sam Creek, about natural 



size 215 



9-10. Chione chiriquiensis, n. sp. , Water Cay, length 13.75 mm.. 248 



11. Myrt^a limoniana Dall, Red Cliff Creek, height 9.50 mm 221 



12-13. Venericardia Terryi, n. sp., Quitana Creek, natural size. ... 216 



14. Venericardia scabricostata Gupp}^ East Grape Point Creek, 



about natural size 216 



15. Diplodonta collina, n. sp., Middle Creek, height 6.75 mm 220 



16. Phacoides radians Conrad, variety medioamericanus, n. sp.. 



Middle Creek, height 9 mm 221 



17. Venericardia scabricostata Guppy, Comadre Creek, about nat- 



ural size 216 



18. Gafrarium limonense, n. sp.. Port Ivimon, length 4. 75 mm 233 



19. Gafrarium altum Dall, variety costaricense, n. van, Estrella 



River, enlarged about 3 times 234 



20. Divaricella quadrisulcata d'Orbigny, Middle Creek, height 



14 mm 224 



21. Diplodonta insula, n. sp.. Water Cay, height 6.5 mm 220 



22. Gafrarium altum Dall, variety costaricense, n. sp., Middle 



Creek, height 4.75 mm 234 



23. My rtsea limoniana Dall, Port Limon 221 



24. Phacoides actinus Dall, Bocas del Toro, height 4.50 mm 224 



