EAST COAST MARINE SHELLS 



47 



cancellate ornamentation by the intersec- 

 tion of the concentric lamellae and weaker 

 radial threads. The posterior slope is 

 weakly depressed in front of the margin. 

 Length 4-6 mm. Depth range 2-124 fathoms. 



PI. 23, Fig. 14 



Cape Henry, Virginia to Cuba 



SECTION BELLUCINA Dall 1901 



LUCINA AMIANTUS Dall. Shell small, solid, 

 white; about twelve strong low ribs which 

 are crossed by strap-like threads; inner 

 margin finely crenulate. Length 6 mm. 

 Depth range 2-640 fathoms. 



'This is an extremely elegant lit- 

 tle shell and can hardly be confused with 

 any other. First found on the west coast 

 of Florida it has since turned up in scat- 

 tered localities. 



PI. 15, Fig. 5 



Cape Lookout, North Carolina to 



West Indies 



GENUS DI VARICELLA V. Martens 1880 



Somewhat rounded semi-glossy shells 

 with peculiar sculpture. 



DIVARICELLA DENTATA Wood. La 

 quadrisulcata, also distingui 

 toothed dorsal margin and the 

 teeth inside the shell. Ther 

 cy in old individuals toward 

 of these, particularly the la 

 The small and deep lunule is 

 ages. Diam. 1.5 inches. It 

 50 fathoms but single valves 

 found on the beaches. 

 PI. 16, Fig. 4 

 PI. 73, Fig. 6 

 North Carolina to Wes 



rger than D. 

 shed by the 



lateral 

 e is a tenden- 

 obsolescence 

 teral teeth, 

 present in all 

 lives in 10- 

 sometimes are 



t Indies 



DIVARICELLA QUADRISULCATA Orblgny. Shell 

 white, surface glossy, sculptured with 

 grooves bent obliquely downward at both 

 sides; lateral teeth obsolete; margin of 

 shell toothed, hinge margin almost straight; 

 one very small tooth in right valve, two 

 small diverging ones in left; ligament al- 

 most concealed. Length 1 inch. 



Found on every Atlantic shore and 

 remarkable for its wide dispersion; also 

 frequent in fossil form. Range 10-50 fath- 

 oms. Much commoner upon beaches than the 

 preceding species. 



PI. 16, Fig. 5 

 Massachusetts to Brazil 



GENUS CODAKIA Scopoli 1777 



Shell large and heavy with more or 

 less reticvilate surface sculpture; exteri- 

 or white; color, when present, chiefly up- 

 on interior and near margins. 



CODAKIA ORBICULARIS Linn§. Shell large, 

 rather solid, narrow sharp umbones; numer- 

 ous radiating ribs or narrow furrows which 

 cut the surface into ridges of varying 

 widths; growth lines elevated making sur- 

 face cancellated; color whitish or yellow- 

 ish, often touched with purple on border, 

 chiefly above. Length 80 mm. 



Very abundant on sandy bottom at 

 depth of a foot or so, or among algae in 

 the Florida Keys. A very fine species. 



PI. 19, Fig. 5 



Florida; Gulf of Mexico; West 



Indies 



SUBGENUS JAGONIA Recluz 1869 



CODAKIA ORBICULATA Montagu. Shell of mod- 

 erate size, covered with rather broad ra- 

 diating ribs, concentric lines not so strong, 

 often with several growth and rest lines; 

 umbones nearest anterior end; shape oblique, 

 moderately impressed; hinge inconspicuous; 

 lunule large and wedge shaped; two pointed 

 lateral teeth in each valve. Length 13 mm. 



Dredged in shallow water of Barnes 

 Sound, Florida. 



PI. ,15, Fig. 6 



PI. 14, Fig. 8 



North Carolina; Florida; West 



Indies 



CODAKIA COSTATA Orblgny (L. antillara Rve.). 

 Large and small radial ribs alternating or 

 in pairs; concentric sculpture least promi- 

 nent; lunule well impressed, narrow, almost 

 heart-shaped; muscle scar not deep, palllal 

 line narrow. Length 13 mm. Depth range 

 13-85 fathoms. 



PI. 15, Fig. 9 



North Carolina to Brazil 



GENUS LORIPINUS Monterosato 1883 



LORIPINUS CHKYSOSTOMA Philippl. Shell 

 large and recognizable by its "mellow 



