PLATE V. 



PSEUDODIADEMA EMERSONI Clark (p. 32). 



U. S. Nat. Mus. 30186, type. 



Figure la. Lateral surface of the test. 



lb. Portion of interambulacrum, X 3. 

 lc. Portion of ambulacrum, X 3. 

 Id. Tubercle from the side, X 5. 

 le. The same from above, X 5. 



Stomechinus hyatti Clark (p. 33). 



U. S. Nat. Mus. 30185, type. 



Figure 2a. Lateral surface of the test, slightly distorted. 

 2b. Portion of ambulacrum, X L 

 2c. Portion of interambulacrum, X 4. 

 2d. Tubercle from above, X 8. 

 2e. The same from the side, X 8. 



Holectypus pealei Clark, n. sp. (p. 33). 



U. S. Nat. Mus. 31192, type. 



Figure 3a. Lateral surface of the test. 

 3b. Upper surface of the test. 



Holectypus ckagini Clark, n. sp. (p. 34). 

 U. S. Nat. Mus. 31193, type. 



Figure 4. Upper surface of the test. 

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