Costa Rica Miocene — Olsson 



287 



9- 

 10. 

 ir. 



Fig. 



Page 



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



length 60 mm 260 



vSanguinolaria alouatta, n. sp.. Banana River, left valve, 



length 54 mm. 

 Psammosolen gatunensis Toula, variety costaricensis, n. var. 



Rio Betey, length 63 mm 260 



Semele Sayi Toula, Sousi Creek, slightly enlarged 258 



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



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



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



mm 213 



Crassatellites bowdenensis Dall, variety costaricensis, n. var. 



length 3.50 mm 213 



PLATE 30. (33) 



Antigona multicostata Sovverby, Water Cay 239 



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



Antigona Harrisiana, n. sp.. Port Limon, length 21.5 mm ... 241 

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

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

 Antigona Blandiana Guppy, Port IvOmon, length 24 mm. 



Chione niactropsis ^Conrad, Gatun, length 30 mm 245 



Chione mactropsis Conrad, Sousi Creek, length 51 mm. 

 Chione holocj^ma Brown and Pilsbry, Gatun, length 36.5 



mm 247 



Antigona tarquina Dall, Saury Creek, about natural size 240 



PLATE 31 (34) 



Fig. J. 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 



dementia dariena Conrad, Sousi Creek, height 60 mm 232 



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



length 42 mm 237 



6-7. Macrocallista maculata Linnaeus, Middle Creek, about nat- 

 ural size '. 234 



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



Ouitana Creek, height 28 mm 243 



