EAST COAST MARINE SHELLS 



69 



umbones. Length 3.5 Inches. 

 PI. 87, Fig. 3 



Cape Hatteras, North Carolina to 

 Central America 



GENUS BARNEA 'Leach' Rlsso 1826 



BARNEA TRUNCATA Say. Truncated Angel Wings. 

 Shell white, very delicate, oblong; anteri- 

 or portion triangular and pointed; posteri- 

 or end trimcate; surface coarse with lines 

 and small ribs; one dorsal accessory shell 

 plate. Length 3 inches. 



Animal dark smoky color, siphon ta- 

 pering. At New Bedford, Massachusetts, 

 this species was taken in mud at a depth 

 of two feet. 



PI. 85, Fig. 16 



Nahant, Massachusetts, to Florida 



Keys 



BARNEA MARITIMA Orbigny. Length 3b mm. 

 PI. 27, Fig. 4 

 West Florida to Texas 



BARNEA COSTATA Linne. Ribbed Angel Wings. 

 Shell large, white, covered with radiating 

 ribs with coarse growth lines producing 

 tooth-like elevations and corresponding in- 

 dentations within shell. 



Animal yellow, tips of siphons 

 stippled with reddish-brown; foot narrow 

 and long; extra valve cartilaginous and 

 spear-shaped. Length 6 inches. 



This species burrows several feet 

 below the surface. Single valves are fre- 

 quent upon the beaches of St. Augustine, 

 Cape Sable and Marco, Florida. 



PI. 27, Fig. 6 



PI. 54, Fig. 7 



Cape Cod, Massachusetts to West 



Indies 



GENUS ZIRFAEA 'Leach' Gray 1847 



Valves of shell divided into two 

 areas by a radial sulcus; accessory shell 

 plates lacking or rudimentary; gape in 

 front large. 



ZIRFAEA CRISPATA Llnn6. Shell widely gap- 

 ing at the ends but touching at center of 

 the base; radiating toothed ribs present 

 in front of a furrow which extends from the 

 umbones across the center of valves; exte- 

 rior with many coarse concentric ridges. 

 Length 2 inches. 



Fine specimens have been taken at 

 Nahant Beach, Massachusetts, and years ago it 

 was coimnon in Charleston Harbor, South Carolina. 

 rl. 27, Figs. 5, 7 

 Labrador to South Carolina 



GENUS MARTESIA Leach 1825 



Valves lengthened behind; when 

 adult characterized by a plain border; um- 

 bonal valves one or two in number; margins 

 often with narrow accessory valves. 



MARTESIA CUNEIFORMIS Say. Shell small, 

 closed, divided obliquely by a serrated 

 canal; marginal shields three, not uniform 

 in size. Length 14-18 mm. 



This form bores in soft rock or 

 wood. 



Fig. 36 



Connecticut to Trinidad 



MARTESIA STRIATA Linn6. Shell closed, 

 obliquely divided in middle; extremely 

 produced; one ventral shield, two dorsal 

 ones. Length 18-23 mm. 



It burrows in hard, often floating 

 timber which accounts for its wide dis- 

 tribution. Specimens varying greatly in 

 size were collected at Oceanus, Florida. 

 It is frequently found at Sanibel. 



Fig. 37 



South Carolina to West Indies; 



Europe; Pacific 



Fig. 36 

 Martesia 

 cuneiformis 



Fig. 37 



Martesia 



striata 



