oe 
J. 5.—Obliquely heart-shaped, thick, ponderous, white, 
under a coarse brown rather glossy cuticle, aud striated 
irregularly and concentrically; beaks povinted, no 
lunule; inside dull white, margin very entire. 4. 
Open Coasts. 
* C. Trianeuraris. Turt. B. p. 136. ¢. 11. f. 19, 
20.—F’. p. 444.—Venvus T. Mont. p. 577. t.17. f. 3. 
—Iin. T.8.p 83.—Pen. 4. p. 205.—D. p. 173.— 
Turt. C. D.: p. 238.—Somewhat triangular, being 
roundish, with a triangular outline towards the beaks 
which are produced and equally sloping on both sides, 
smooth, strong; lunule lanceolate; two teeth and a 
curved lateral in one valve, three and a lateral in the 
other. 3. W. Coasts and Dublin Bay. 
C. Minima. Turt. B. p. 137.—F. p. 444.—VENvs 
M. Mont. p. 121. ¢.3.-f. 3.—Lin. T. 8. p. 81.—Pen 
4. p. 203.—D. p. 166.—Turt. C. D. p. 236.—-Rounded 
heart-shaped, a little compressed, with broad smooth 
transverse rather obscure ribs, whitish or flesh color, with 
four red spots, two near the hinge, two at the margin, 
and generally two white lines connecting the two upper 
Penne 
* This and the succeeding species are but provisionally 
considered as of this Genus. 
