APPENDIX. 307 



On Cardita (p. 144). C. squamifera of Sowerby proves identical 

 with C. crassicosta (p. 146), and is a native of Australia, not of 

 Senegal; C. squamosa of Sow. (p. 147) has been termed C. Sene- 

 galensis by Reeve, whose Cypric. vellicata (I. Cyp. f. 7) is the mature 

 state of C. laevigata (p. 148). For additional species consult Eeeve's 

 monograph (Conch. Ic.), Proc. Bost. 2, 3, Zeit. Mai. 1847, 1848, 

 Voyage de la Venus, and D'Orbigny's S. Am. and Cuba Shells. 



Cardita megastropha (as Venericardia m. p. 129), t. 18, f. 22 ... 

 C. sulcata, p. 144, t. 18, f. 2 ... C. Ajar, p. 144, t. 18, f. 3 ... 

 C. borealis, p. 145, t. 18, f. 4 ... C. crassa, p. 145, t. 17, f. 58 ... 

 C. Cuvieri, p. 146, t. 17, f. 56 ... C. tumida, p. 146, t. 17, f. 57 ... 

 C. varia, p. 146, t. 18, f. 21 ... C. tricolor, p. 146, t. 17, f. 60, and 

 t. 18, f. 9 ... C. spurca, p. 146, t. 18, f. 16 ... C. muricata, p. 146, 

 t. J 8, f. 17 ... C. crassicosta, p. ]46, t 18, f. 19 ... C. rufescens, 

 p. 147, t. 18, f. 20 ... C. nodulosa, p. 147, t. 18, f. 25 ... C. caly- 

 culata, p. 147, t. 18, f . 7 ... C. aviculina, p. 148, t. 18, f. 24 ... 

 C. sublaviqata, p. 148, t. 18, f. 28 ... C. lithophaga, p. 148, t. 18, 

 f. 26 ... G. radiata, p. 148, t. 18, f. 8 ... C. afjinis, p. 149, t. 18, 

 f. 15 ... C. pectunculus, p. 149, t. 18, f. 13. 



Cardita Australis (t. 17, f. 59). — Venericardia A. Quoy, Ast. 

 t. 78, /. 11, 2. — C. tridentata, Reeve (as of Say, Am. C. t. 40), 

 I. Car. f. 22. Transverse, obovate, very inequilateral, solid, of an 

 uniform dull whitish hue, at most subventricose, covered with 

 radiating crenated ribs (about 22), that are rounded, close together, 

 and not much raised ; the crenae nodulous on the umbones, squamu- 

 lar near the convexly sloping ligamental edge, and obsolete (in the 

 adult) near the subarcuated ventral margin ; costal intervals smooth ; 

 lunule small, profound, cordate; inside white. If... If. N.Zea- 

 land. 



Cardita abyssicola (t. 18, f. 1), Hinds, Sulp. p. 65, t. 19,/. 3. — 

 Reeve, I. Card. f. 37. Squarish-subcordate, very inequilateral, firm, 

 tumid, snow-white, with very numerous square-cut prominent radi- 

 ating ribs, that are most closely crenated with raised scales, and 

 divided by broader intervals ; ligamental edge horizontal, straightish, 

 subparallel with the ventral; anterior edge rounded; posterior 

 extremity narrow: lunule large, rounded-cordate, impressed. 1. 

 Straits of Malacca. 



Cardita canaliculata (not of Reeve, Z. P. 1843, p. 193), t. 18, 

 /. 5. Transversely suborbicular, subcordate, rather oblique, very in- 

 equilateral, rather strong, more or less ventricose, dull, mottled with 

 white and intense flesh-colour, the former chiefly present at the um- 

 bones ; rayed with about 18 prominent ribs, all of them closely 

 noduled with very numerous transverse solid crenae ; their intervals 

 square-cut, and of about equal breadth ; ventral edge arcuated, rising 



