PLATE XXII. 



Coptosoma mortoni (De Loriol) (p. 62). 

 Collection P. de Loriol, type. 

 Figure la. Upper surface of the test. 

 lb. Lateral surface of the test, 

 lc. Three ambulacral plates, X 8. 

 Id. Interarabulacrum, X 3. 

 le. Three interambulacral plates, X 6. 



PSAMMECHINUS CINGITLATUS Clark (p. 63). 



Acad. Nat. Sci. Philadelphia 1467, type. 

 Figure 2a. Upper surface of the test. 

 2b. Lower surface of the test. 

 2c. Lateral view of the test. 

 2d. Interambulacrum, X 5. 

 2e. Three plates of the same X 8. 

 2f. Ambulacrum, X 5. 

 2g. Four plates of the same, X 8. 

 2h. Peristome, X 2. 

 2i. Tubercle, X 20. 



