184 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



FIG. 6. Inner view of same, X 1. 



7. Outer view of same, X li. 



8. Panopeus, species, Cat. No. 324254, dactylus of right cheliped, upper 



view, X 3. 



9. Outer view of same, X 3. 



10. Parthenope panamensis Rathbun, holotype, merus of left cheliped, outer 



view, X IJ. 



11. Inner view of same, X 1J. 



12. Hepatus, species, Cat. No. 324239, dactylus of left cheliped, outer view. 



X 2. 



13. Euryplax culebrensis Rathbun, holotype, propodus of right cheliped, 



upper view, X 3J. 



14. Outer view of same, X 3$. 



15. Thaumastoplax prima Rathbun, paratype, carapace, X 2. 



16. Impression of same, X 2. 



17. Thaumastoplax prima, holotype, X 2. 



18. Impression of same, X 2. 



