PLATE XIX. 



PsEUDODIADEMA DIATKETUM (Morton) (p. 56). 

 Acad. Nat. Sci. Philadelphia 1471, type. 



Figure la. Lower surface of the test, 

 lb. Lateral view of the test. 

 lc. Two interambulacral plates, X 5. 

 Id. Three ambulacral plates, X 8. 

 le. Same, X 8. 

 If. Tubercle, X 8. 



Cyphosoma hilli Clark (p. 59). 

 U. S. Nat. Mus. 8311, type. 



Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Lateral surface of the test. 

 2d. Upper portion of an ambulacrum, X 5. 

 2e. Three plates of the same, X 8. 

 2f. Three interambulacral plates, X 4. 

 2°;. Tubercle. 



Coptosoma speciosum Clark (p. 61). 

 Acad. Nat. Sci. Philadelphia 14GS, type. 



Figure 3a. Upper surface of the test. 

 3b. Lower surface of the test. 

 3c. Lateral surface of the test. 

 3d. Upper portion of an interambulacrum, X 4. 

 3e. Three plates of the same, X 5. 

 3f. Three plates of ambulacrum, X 4. 

 3g. Same, X 4. 

 3h. Tubercle, X 10. 

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