TRIBE CONCHACEA. 103 



cealed, and the markings consisting of waved ferruginous lines 

 lj..lf. — Indian Ocean. 



C. Dispar. Desk. — Venus D. D. p. 199. Oval not con- 

 vex, with the anterior extremity more or less obliquely ribbed, and 

 the space not thus occupied transversely striated : lunule more or 

 less lanceolate and brown. 1^. — Variety. A. (Muscaria. Lam. 

 59. — Ch. f. 1981, 2.) Whitish with scattered rufous spots, and 

 the anterior slope lettered. 1 — Variety. B. (Pulicaris. Lam. 60. 

 Del. t.9.f.5.) With scattered rufous spots, or white mottled 

 with purple and chesnut. — Variety. C. (Mixta. Lam. 61. — E. 

 t. 271. f. 2.) Bluish white, with chesnut spots. 



C. Abbreviata. Lam. 62. — Del. t. 9. f. 1. Obovate and 

 retuse at the anterior end, on a whitish ground covered with red 

 linear forked markings, some of which are barred transversely so 

 as to resemble letters, with numerous transverse striae, and a few 

 oblique longitudinal ones, which diverge anteriorly within, with a 

 dark brown spot under the beaks. 1. — Indian Ocean. 



C. Histrio. Gray Ann. Phil. 25. — Venus H. Gmel. 3287. 

 — D. p. 197.— W. t. S.f. m. — Ch.f. 407.— E. t. 280./. 1. 

 Suborbicular, with raised acute transverse slightly reflected striae, 

 white mottled and rayed with brown, and striped with chesnut on 

 the anterior slope, of which the depression is obsolete : lunule 

 cordiform, impressed and ferruginous. 1^. — E. Indies. 



C. Excisa.— Venus. E. Chem.f. 400, l.—D.p. 195.— W. t. 

 8. f. 82. Suborbicular, longer than broad, inequilateral, very con- 

 vex, pure white, with crowded raised transverse rib-like striae ; liga- 

 mental edge very sloping, ligament sunken ; beaks much 

 incurved ; lunule large, indistinct, and ovate-cordiform : inside 

 white, the margin entire.— If .. 1^. — Tranquebar. 



C, Sulcata. — Circe S. Gray in Analyst, 1838. Cordate, 

 trigonal, rather compressed, solid, yellowish brown, with two or 

 three brown rays not reaching the umbo, finely radiately striated, 

 and with close blunt regular concentric ridges, crossed by some ob- 

 scure curved grooves on the ends ; lunule lanceolate, lineated with 

 brown ; inside rosy white. Somewhat like Scripta, bid rather 

 more convex, striated, and the umbo regular and not flattened. 



C. Crocea. — Circe C. Gray in Analyst, 1838. Cordate, 

 roundish, rather convex, slightly concentrically grooved, yellow, 

 with obscure brown lines on the anterior side ;- inside yellow, no 

 syphonal inflection. 



C. Planata. — Circe P. Gray in Analyst, 1838. Oblong, 

 sub-quadrate, rather narrower posteriorly, browner and more 

 rounded anteriorly. Compressed, thin, pellucid white, smoothish, 

 very finely and closely striated concentrically : inside white ; no 

 syphonal inflection. 



C. Lamarkii. — Chione L. Gray in Analyst, 1838. Oblong, 



