459 



Costa Rica Miocene — Olsson 287 



Page 



5. Sanguinolaria alouatta, n. sp., Banana River, right valve, 



length 60 mm 260 



6. Sanguinolaria alouatta, n. sp., Banana River, left valve, 



length 54 mm, 



7. Psammosolen gatunensis Toula, variety costaricensis, n. var. 



Rio Betey, length 63 mm 260 



8. Semele Sayi Toula, Sousi Creek, slightly enlarged 258 



9. Tagelus cebus, n. sp, , Rio Betey, length 36 mm 261 



10. Abra triangulata Dall, Bocas del Toro, length 7.25 mm 259 



11. Crassatellites midiensis, n. sp.. Middle Creek, length 3.25 



mm , 213 



12. Crassatellites bowdenensis Dall, variety costaricensis, n, var, 



length 3.50 mm 213 



PI.ATE 30. ( 33 ) 



Fig. I, Antigona multicostata Sowerby, Water Cay 239 



< 2. Chione Rowleei, n. sp,, Banana River, length 42 mm 244 



3. Antigona Harrisiana, n. sp.. Port Limon, length 21,5 mm ... 241 



4. Antigona rugosa Gmelin, Port Limon, about ^ natural size 240 



5. Antigona Blandiana Guppy, Comadre Creek, length 30 mm.. 241 



6. Antigona Blandiana Guppy, Port Lomon, length 24 mm. 



7. Chione mactropsisfConrad, Gatun, length 30 mm 245 



8. Chione mactropsis Conrad, Sousi Creek, length 51 mm, 



9. Chione holocyma Brown and Pilsbry, Gatun, length 36.5 



mm 247 



10. Antigona tarquina Dall, Saury Creek, about natural size 240 



PIRATE 31 (34) 



Fig. I, Dosinia acetabulum Conrad, Rio Betey, somewhat reduced... 231 



2. Cyclinella beteyesis, n. sp. , Rio Betey, height 39 mm 242 



3. Pitaria circinata Born, Saury Creek, about natural size 236 



4. dementia dariena Conrad, Sousi Creek, height 60 mm 232 



5. Pitaria Hillii Dall, variety musanica, n. var,. Banana River, 



length 42 mm 237 



6-7, Macrocallista maculata Linnseus, Middle Creek, about nat- 

 ural size 234 



8. Cyclinella subquadrata Hanley, variety quitana, n. var., 



Ouitana Creek, height 28 mm 243 



