104 TESTACEOUS MOLLUSCA. 



subcordate, rather thick, solid, smooth, pale brown, with unequal 

 white rays ; anterior slope punetulate : lunule lanceolate, purple 

 brown ; inside white, the margin purplish : posterior lateral tooth 

 short, conical, close. 2\. 



C. Apicalis. — Chione A. Gray in Analyst, 1 838. Oblong, 

 subcordate, rather thick, solid, smooth, yellowish white, with a few 

 arrow-shaped pale brown spots above. Umbones reddish brown: 

 inside white. 



C. Bicolor. — TrigonaB. Gray in Analyst, 1838. Triangu- 

 lar, equilateral, rather compressed, whitish or pale fawn-coloured, 

 pellucid : slopes flattened, the interior stained internally with 

 purple, ventral edge scarcely arcuated ; lunule large, well-defined, lan- 

 ceolate ; inside flesh-coloured teeth as in Planulata. J . . 1 . — Africa. 



C. Pulchra. Gray in TV. S.t.2.f. 16. Ovate heart-shaped, 

 moderately convex, thickish, posteriorly grooved ; polished, variable 

 in colouring, usually pale buff with livid fawn-coloured rays and 

 marblings : anterior slope with dark chestnut transverse waved 

 lines : lunule elongated heart-shaped : inside stained with purple, 

 margin entire. 1 . 1^. — S. Seas. 



C. Lubrica Brad. Z. P. 1835. Rounded heart-shaped, 

 glossy, rather violet, anteriorly with obtusely concentric sub-elevated 

 lines, which are small and close at the umbones, but wider and 

 more distant as they recede* inside white. 1J- . . 1 t 7 q. — C. 

 America. 



C. Rosea. Brod. and Sow. Z. J. 4. — Beechey. Zool. t. 43. f. 

 7. Obliquely cordate, subcompressed, purplish-rosy, concentrically 

 grooved, posteriorly with distant lamellae, anteriorly with very short 

 broadish spines ; inside white. l T 3 y . . l T 7 jj. — Pacific. — Bears 

 much resemblance to a spineless Dione ; usually with a white ray 

 on each slope. 



C. Tortuosa. Brod. Z. P. 1835. Obliquely heart-shaped, 

 anteriorly somewhat lobed, white slightly tinged with chestnut 

 towards the umbones, with numerous blunt and coarse anteriorly 

 irregular concentric lines. i£ . . 1J-. — Panama. — Variety. Ele- 

 gantly and sub-radiatingly painted with rufous and rose-colour. 



C. Squalida. Sow. Z. P. 1835. Ovate subcordate, thickish, 

 smooth, pale brown, with sometimes irregular darker spots ; epi- 

 dermis brown : anterior side the longer and subacuminated near 

 the ventral portion. — Variety. With two rays. (Biradiata. Sow. 

 in B.echey. Z t. 43./. 5.) 2 . . 2-^.— W. Columbia.— Not 

 unlike Macidosa. 



C. Hieroglyphica. Conr. Jour. A. N. S. Phil. 7. p. 253. 

 t. 19../'. 22. Sub -triangular, with concentric striae distinct only 

 at the margins ; (white, often with brown triangular spots ^an- 

 teriorly longer, sub-cuneiform and rounded at the extremity : lunule 

 cordate, defined by an impressed line. 1J.— • Sandwich Isles. 



