284 



Bulletin 39 



456 



Page 



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



ural size. 



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



duced 185 



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



ural size, interior view to show 

 high, cardinal area T94 



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



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



exterior of left valve. 



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



Banana River, interior of right 

 valve, to show form and low card- 

 inal area. 



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



right valve, slightly reduced 181 



9. Glyeymeris Lloydsmithi Pilsbry and Brown, same locality 



left valve. 



10. Glyeymeris Lloydsmithi Pilsbry and Brown, same locality 



right valve. 

 PIRATE 26 (29) 



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



ural size .....254 



2. Tellidora cristata Reeluz, 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 costarieana, 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 costarieana, n. sp.. Banana River, about natural size 251 



10. Tellina crystallina Wood, Banana River, enlarged nearly 



twice 249 



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



length 15 mm 257 



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



2,}4 times 253 



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



14. Macoma costarieana, n. sp. , Rio Betey, about natural size 256 



