64* DAVENPORT ACADEMY OF NATURAL SCIENCES. 



Venus flexuosa L. Common at Terraciea Island, many shells beau- 

 tifully marked with zigzag lines. 



Venus flexuosa. var. A dark brown-colored variety was found with 

 the above. 



Venus mortoni Con. The common edible clam of Florida, some- 

 times growing to an immense size, and having very heavy shells. It is 

 usually found in shallow muddy bays, and is obtained by "treading out," 

 though it is sometimes washed up from outer beaches. I have a pair 

 of shells which weigh five pounds. 



Venus mortoni, var. fulgurans Tryon. The shell thus named is 

 only a young form of the preceding, marked with chevron-shaped brown 

 lines, and sometimes very beautiful. 



Venus cane ellata Chem. West coast. In some places, notably at 

 Mullet Key, the worn valves of this species are thrown on shore by the 

 ton, yet it is rather rare as a living shell. I have never obtained it by 

 dredging in the open gulf, and have rarely seen normal pairs thrown up 

 on outer beaches. 



Venus interpurpurea Con. Egmont Key; rare. Odd valves of 

 what seems to be this species were found on the mainland, east coast 

 of Honduras. 



Venus pygmcea Lam. Tortugas; dredged in Tampa Bay. 



Venus pygmcea Lam., var. incequivalvis D'Orb. Tampa Bay; dredged 

 living in eight fathoms. Picked up dead and worn at Egmont Key and 

 the Tortugas. 



Venus beaui Reel. Tortugas. 



* Venus paphia L. Odd valves were obtained by William Bahrt on 

 the south-east Keys. 



Venus listeri Cray. Valves were found at Key West. A half-dozen 

 fine pairs were obtained on sandy flats at the Marquesas Keys. 

 Venus granulata Gm. Valves, Tortugas. 



Cytherea gigantea Gm. West coast; very common. A large and 

 beautiful shell. 



Cytherea maculata L. West coast; rather rare. A very handsome 

 species. 



Cytherea convexa Say. A New England species, of which single 

 valves were picked up at Long Key. 



Cytherea dione L. Young, Tortugas. 



Cytherea conradina Dall. Long Key, Sarasota Bay. This shell 

 varies a good deal, some forms being pure white, quite solid, and in- 

 flated, others with purple interior and zigzag markings on the outer sur- 

 face. Another form is somewhat flattened and drawn out, after the 

 manner of Venus flexuosa. 



Cytherea circinata Born. A single young pair was found at Tortugas. 



Cytherea hebrcea Lam. Tortugas. 



