EAST COAST MARINE SHELLS 



umbones. Length 3.5 Inches. 

 PI. 27, Fig. 3 



Cape Hatteras, North Carolina to 

 Central America 



GENUS BARNEA 'Leach' Risso 1826 



BARNEA TRUNCATA Say. Truncated Angel Wings. 

 Shell white, very delicate, oblong; anteri- 

 or portion triangular and pointed; posteri- 

 or end truncate; surface coarse with lines 

 and small ribs; one dorsal accessory shell 

 plate. Length 3 inches. 



Animal dark smokj' color, siphon ta- 

 pering. At New Bedford, Massachusetts, 

 this species was taken in mud at a depth 

 of two feet. 



PI. 25, Fig. 16 



Nahant, Massachusetts, to Florida 



Keys 



BARNEA MARITIMA Orbigny 

 PI. 27, Fig. 4 

 West Florida to Texas 



BARNEA COSTATA Linnfe. Ribbed 

 Shell large, white, covered wi 

 ribs with coarse growth lines 

 tooth-like elevations and corr 

 dentations within shell. 



Animal yellow, tips of 

 stippled with reddish-brown; f 

 and long; extra valve cartilag 

 spear-shaped. Length 6 inches 



This species burrows s 

 below the surface. Single val 

 quent upon the beaches of St. 

 Cape Sable and Marco, Florida. 



PI. 27, Fig. 6 



PI. 54, Fig. 7 



Cape Cod, Massachusett 



Indies 



Length 3b mm. 



Angel Wings, 

 th radiating 

 producing 

 esponding in- 



siphons 

 oot narrow 

 inous and 



everal feet 

 ves are fre- 

 Augustine, 



s to West 



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 Linn6 . 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 Deen taken at 

 Nahant Beach, Massachusetts, and years age it 

 was common in Charleston Harbor, South Carolina. 

 fl. 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; extrerrely 

 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; 



Exirope; Pacific 



Fig. 36 

 Martesia 

 cuneiformis 



Fig. 37 



Martesia 



striata 



