28 BULI<ETIN 3 (no) 



Explanation of Plate 2. 



(8) 



Fig. I, a, b. Rangia cuneatus, var, galvestonensis , Page. 



nov. var. ; long. 16 mm 11,93. 



2, a, b, c. Rangia quadricentennialis , n. sp. ; 



long. 13 mm II, 93. 



3, a, b. Mactra quadricentennialis, n. sp. ; 



long. 9 mm II, 93. 



4, a. Corbula galvestonensis, n. sp. ; long. 5.5 mm.. 12, 94. 



5, a. Corbula {Potamomya) priscopsis , n. sp. ; 



long. 13 mm 12, 94. 



6, Corbula swiftianaf AAra. ; long. 15 mm 12,94. 



