PLATE XIII. 



Salenia ttjmidula Clark (p. 50) 

 Acad. Nat. Sci. Philadelphia 1448, type. 



Figure la. Upper surface of the test, X 2. 

 lb. Under surface of the test, X 2. 

 lc. Lateral surface of the test, X 2. 

 Id. Interarnbulacrum, X 5. 

 le. Single plate of same, X 8. 

 If. Portion of ambulacrum, X 10. 

 lg. Apical system, X H- 

 lh. Genital plate of same, X 6. 

 li. Peristome, X 3. 

 lj. Tubercle, X 10. 



Salenia bellula Clark (p. 51). 

 Acad. Nat. Sci. Philadelphia 1446, type. 



Figure 2a. Upper surface of the test, X 2. 

 2b. Under surface of the test, X 2. 

 2c. Lateral surface of the test, X 2. 

 2d. Three interambulacral plates, X 6. 

 2e. Three ambulacral plates. X 10. 

 2f. Apical disk enlarged. 

 2g. Tubercle, X 10. 

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