500 PROCEEDINGS OF THE ACADEMY OF [July, 



Leda vulgaris var. obliterata n. v. 



A form closely related to L. vulgaris was collected by Mr. Clarence 

 B. Moore in Indian Pass, Appalachicola Bay, Calhoun Co., Fla. It 

 differs by having the valve smooth until it reaches an altitude of 

 about 4 mm., after which it is concentrically grooved as in vulgaris. 

 There are about 16 teeth before, 18 behind the beaks. 



Length 10.7, alt. 6, semidiameter 2.2 mm. 



Seventeen detached valves but no complete shells were taken. 

 Cotypes No. 109,049 A. N. S. P. 



