284 Bulletin 39 456 



Page 



2. Area costaricensis, n. sp., co-type, Hill ia,Banana River nat- 



ural size. 



3. Area actinophora Dall, typical form, Mt. Hope, slightly re- 



duced 185 



4. Area MaeDonaldi Dall, Hill No. 3, Banana River, nearly nat- 



ural size, interior vievvf to show 

 high, cardinal area 194 



5. Area MaeDonaldi Dall, exterior of the same specimen. 



6. Area MaeDonaldi Dall, variety subreversa, n. var., Rio Betey 



exterior of left valve. 



7. Area MaeDonaldi Dall, variety subreversa n. var.. Hill No. 3 



Banana River, interior of right 

 valve, to show form and low card- 

 inal area. 



8. Glycymeris Lloydsmithi Pilsbry and Brown, Red Cliff Creek, 



right valve, slightly reduced 181 



9. Glycymeris L,loydsmithi Pilsbry and Brown, same locality 



left valve. 

 10. Glycymeris Ivloydsmithi Pilsbry and Brown, same locality 



right valve. 

 PI.ATE 26 (29) 

 Fig. I. Tellidora cristata Recluz, Hill 3, Banana River, nearly nat- 

 ural size 254 



2. Tellidora cristata Recluz, Hill la, Banana River, nearly nat- 



ural size. 



3. Tellina dariena Conrad, Water Cay, natural size 252 



4. Tellina lepidota Dall, Water Cay, length 24 mm 251 



5. Tellina lepidota Dall, Water Cay, length 21 mm. 



6. Tellina eostarieana, n. sp.. Banana River, about natural size 251 



7. Tellina rovala, n. sp. , Water Cay, slightly enlarged 249 



8. Tellina rovala, n. sp.. Water Cay, (type) slightly enlarged. 



9. Tellina eostarieana, n. sp., Banana River, about natural size 251 



10. Tellina erystallina Wood, Banana River, enlarged nearly 



twice 249 



11. Maeoma panamensis Dall, variety canalis n. var. ,Mt. Hope, 



length 15 mm 257 



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



3>^ times 253 



13. Maeoma gatunensis Toula, Banana River, about natural size 257 



14. Maeoma eostarieana, n. sp. , Rio Betey, about natural size 256 



