214 NEW-YORK FAUNA — MOLLUSCA. 



GENUS LUCINA. Bruguieres. 



Animal with the edges of its mantle delicately fringed. Tubes short and united, entering into 

 a fold of the mantle. Foot cylindrical, elongated. Shell rounded ; beaks small. Two 

 diverging cardinal teeth, one of which is bifid ; occasionally two distinct lateral teeth in 

 each valve. Palleal impression without a sinus. Ligament posterior and elongate. 



L/UCINA DIVARICATA. 



PLATE XXVI. FIG. 273. 



(STATE COLLECTION.) 



Tellina divaricate Lin, Syst. Nat. p. 1120. 



Strigilla id. Ttjrt. Test. Brit. p. 119. 



Lucina id. Lam. Am. sans vert. p. 575. Gould, Invertebrata of Mass. p. 70. 



Description. Shell thin, orbicular, equilateral : beaks small, prominent, inclined forwards ; 

 basal margin regularly rounded and crenate. Surface with well marked concentric lines, 

 crossed by deep oblique lines passing towards both ends, and giving a beautiful reticulated 

 appearance. Cardinal teeth minute ; one in the right valve very small, and two small di- 

 verging ones in the left : lateral teeth often wanting. 



Color. Dingy white, occasionally with a reddish tinge. 



Vertical axis, 1*0; transverse ditto, 0'7. Diameter, - 5. 



This shell occurs throughout the whole seacoast of the United States. It is a remarkable 

 distinct species, and occurs also on the shores of Europe. 



(EXTRA-LIM1TAL.) 



L. radula, Montagu. (Couthouy, Bost. Jour. Vol. 2. p. 153. Pl. 26, fig. 274 of this book.) Shell 

 thick, convex, with concentric lamellated striae; on each side of the hinge, a superficial furrow : 

 beaks small, distinct, incurved : no lateral teeth : lumule depressed, lanceolate. Color : epidermis 

 whitish brown ; beneath opake white. Length, 1 -0 — 1-5. Northern Coast. 



L. contractu. (Say, Ac. Sc. Vol. 4, p. 145, pL 10, fig. 8. Pl. 27, fig. 275 of this book.) Shell 

 moderately thin, with concentric striss and intermediate raised lines. Anterior submargin with a 

 very slightly impressed line. Cardinal teeth, one in the left valve and two in the right, of which 

 the posterior is sub-bifid, radiate, striate within towards the margin. Color, whitish. Length 

 and breadth, 1 -0 - 2-0. Col. Totten found this alive on the coast of Rhode-Island. 



L. flexuosa, Mont. (Gould, 1. c. fig. 52.) Shell very minute, globose, triangular : a deep fold 

 along the margin, rendering the base sinuous : a single rudimentary tooth in each valve ; within 

 with radiating lines. Color, white. Length and width, • 3 ; diameter, 0*1. An juv. prssced. ? 

 Stomachs of fishes. Northern Coast. 



