PLATE LXXV. 



Laganum archerensis Twitchell, n. sp. (p. 161). 



U. S. Nat. Mus. 164667a, type. 



Figure la. Upper surface of the test, 

 lb. Lower surface of the test, 

 lc. Lateral surface of the test. 

 Id. Posterior surface of the test. 



Laganum johnsoni Twitchell, n. sp. (p. 162). 



U. S. Nat. Mus. 137202, type. 



Figure 2a. Upper surface of the test. 



2b . Lower surface of the test. 



2c. Lateral surface of the test. 



2d. Posterior surface of the test. 



Laganum floridanum Twitchell, n. sp. (p. 163) 



U. S. Nat. Mus. 137884, type. 



Figure 3a. Upper surface of the test. 



3b. Lower surface of the test. 



3c. Lateral surface of the test. 



3d. Posterior surface of the test. 



Laganum dalli Twitchell, n. sp. (p. 164). 



U. S. Nat. Mus. 164667b, type. 



Figure 4a. Upper surface of the test. 

 4b. Lower surface of the test. 

 4c. Lateral surface of the test. 

 4d. Posterior surface of the test. 

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