288 



BuiytETiN 39 



460 



Page 



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



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



size 239 



11. Pitaria Guppyana Gabb, Port Limon, about natural size 237 



PI. ATE 32 (35) 



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



size 235 



2-3. Pitaria Van Wink] ese, 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 Sara Creek, about natural 



size 215 



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



II. Myrtaea limoniana Dall, Red Cliff Creek, height 9.50 mm 221 



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



14. Venericardia scabricostata Guppy, 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. var., Bstrella 



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. Myrtaea limoniana Dall, Port Limon 221 



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



