PLATE XV. 



Rhynchopygua caribaearum, I-4. 



1. Section showing actinostome and lower jjart of test from interior, 4/^ in diam. 



2. Satne, test denuded, from above, ij-s in diam. 



3. Same, actinal side, sliowing bare pitted median band, 4^'i in diam. 



4. Section showing abactinal part of test from the interior, i^. in diam. 



Echinolampas Hellei, 5-11. 



5. Seen ti-om above, nat. size. 



C. Actinostome of same, enlarged, showing bourrelets and phyllodes, slightly inclined. 



7. Anal system of same, enlarged. 



8. Actinostome of same, somewhat less magnified than fig. G. 



9. Actinostome, seen from interior of test, enlarged. 



10. Abactinal system, seen from interior of test, enlarged. 



11. Abactinal system, seen from above, enlarged. 



