EAST COAST MARINE SHELLS 



67 



CORBULA BARRATTIANA Orblgny. Barratt's 

 Little Basket. Posterior end broadly 

 truncated, posterior slope well defined; 

 wide and undulating concentric ribs; nvuner- 

 ous distinct radial lines, especially upon 

 slope; umbones close together and of moder- 

 ate size. Length 8.9 mm. 



Dredged by the writer off Tiger 

 Key, west Florida, In shallow water. Depth 

 range 2-287 fathoms. 



PI. 61, Figs, 7a, b, c 



Cape Hatteras, North Carolina to 



Jamaica 



CORBULA CHITTYANA C. B. Adams. Resembles 

 C. barrattiana but thick and solid, very 

 wide; two periods of growth like C. 

 dletziana. Length 8.5 mm. Range 4-5 fath- 

 oms, rare. Included for comparison. 



PI. 61, Figs. 6a, 6d 



Kingston Harbor, Jamaica 



CORBDLA CONTRACTA Say. Squeezed Basket. 

 Shell white, covered with many concentric 

 raised lines or ribs; anterior end rounded; 

 somewhat pointed behind; basal margin con- 

 tracted in middle; hinge tooth slender, 

 erect. Length 5-12 mm. Range 3-63 fath- 

 oms. 



Abundant about Rhode Island and 

 Martha's Vineyard. It also is plentiful 

 upon the Florida east coast. 



PI. 8, Fig. 9 



PI. 60, Figs. 6a, 6b 



Cape Cod, Massachusetts to Jamaica, 



British West Indies 



Length 12.7 mm. 



CORBULA CUBANIANA Orblgny 



A deep-water shell. 



PI. 60, Figs. 3a, b, c 

 Florida Strait to Jamaica 



CORBULA CYMELLA Dall . A rare shell which 

 has only been taken in 68-75 fathoms at 

 one station. Length 13.5 mm. 

 PI. 60, Figs. 7, 7a 

 Gordon Key, Florida Keys 



CORBULA DIETZIANA C. B. Adams. Length 

 10.7 mm. Range 14-100 fathoms. Off west 

 Florida it has been taken in 30 fathoms. 

 PI. 60, Figs. 5a, b 

 North Carolina to West Indies 



CORBULA DISPARILIS Orblgny. A species va- 

 riable in its proportions sind sculpture. 



The smaller valve is often pink, or pinkish 

 brown. Length 8 mm. Range 5-805 fathoms. 

 PI. 60, Figs. 4a, b 

 North Carolina to West Indies 



CORBULA KJOERIANA C. B. Adams. Differs 

 from C. swlftiana in being less rostrated, 

 also more elongated behind; both valves 

 sculptured alike. Length 12 mm. Range 

 4-5 fathoms. Introduced for comparison. 



PI. 60, Figs. 6, 6a, 6b 



St. Thomas; Jamaica 



CORBULA KREBSIANA C. B. Adams. Shell tri- 

 gonal, very inequlvalve, inequilateral; 

 large valve rostrated; white, often tinged 

 with pink; large valve closely and finely 

 furrowed; umbones very convex; teeth small. 

 Length 6.1 mm.; alt. 5.1 mm. Range 8-85 

 fathoms. 



PI. 60, Figs, la, b 

 Florida to the West Indies 



CORBULA NASUTA Bowerby. Length 8.5 mm. 



Range 4-63 fathoms. 



PI. 61, Figs. 6a, b, c, d 



North Carolina to the West Indies 



CORBULA SWIFTIANA C. B. Adams. Swift's 

 Basket. Shell triangular, inequlvalve; 

 posterior ridge sharp and distinct in both 

 valves, terminating in sharp beak at base; 

 surface of Juvenile specimens almost smooth; 

 concentric lines becoming stronger with 

 age and showing feeble radial ribs; color 

 whitish. Length 9 mm. 



The most plentiful Corbula in Flor- 

 ida waters. It may easily be procured in 

 Tarpon Bay, Sanibel. Range 0-450 fathoms. 



PI. 57, Fig. 9 



PI. 61, Figs. 5a, b, c 



Cape Hatteras, North Carolina to 



Venezuela 



GENUS BASTEROTIA 



BASTEROTIA QUADRATA GRANATINA Dall. Length 

 10 mm. Range 6-640 fathoms. 



PI. 60, Figs. 2a, b 



North Carolina to Texas; West Indies 



Family Saxicavidae 



Shell slightly gaping at each end, 

 elongate, irregular; hinge toothless or 

 with a rudimentary tooth in each valve; 



