264 TESTACEOUS MOLLUSCA. 



ther solid, lower valve inflated; yellowish clouded and radiated 

 with brown, with larnelliform serrated concentric wrinkles whose 

 points are white and disposed in the form of rays; ears large 

 body large, not oblique, as long at least as the hinge margin : no 

 tail, anterior sinus slight : nacre silvery, often irridescent : inner 

 margin broad and spotted with brown : cardinal and lateral teeth 

 distinct. Var. A. Pallida. Conr. J. Philad. 7. t. 19. /. 6. 

 p. 24.Q. — Subquadrate, not clouded, compressed. 2. Sandwich 

 Isles. l 



MELEAGRINA. 



Somewhat equivalve, rounded, quadrate, scaly on the outside, dorsal 

 margin straight and not winged anteriorly : a sinus at the pos- 

 terior side of the shell for the passage of the byssus, at which place 

 the left valve is notched, and narrow ; hinge linear, and destitute 

 of teeth ; ligamental area marginal, elongated, and nearly ex- 

 ternal, dilated in the centre. 



Margaritifera. Mar Lam. 1.— Mytilus M. Lin. Syst. 1155. 

 —Lin. Mus. Ulr. 538.— D. p. 304.— CA./. 717,8.— E. t. 177. 

 /. 1 to 4.— IV. t. 12. /. 4.— Knorr. 4. t. 18./. I.— List. t. 221,2 

 — Avicula M. Soiv. G. — Reeve Sys. t. 110. Subquadrate, sub- 

 orbicular, solid, compressed, green or olive green with white or 

 pale rays, imbricated by concentric lamellae, which are produced 

 at intervals in flat white tooth-like projections, in regular radi- 

 ating rows : anterior edge subincurved : nacre white, usually green- 

 ish towards the edges. 7. Indian Ocean, §c. 



M. Radiata. — Avicula R. Leach Zool. M. t. 43. — Mytilus 

 R. D.p.302.—Knor. 2. /. 25./. 2, 3,?— M. Margaritifera. 

 Var. Lam. Subquadrate, longer than broad, rather depressed, 

 oblique, thin, pellucid, white with purple stains, girt with raised 

 concentric lamellae, which are fringed with long lanceolate concave 

 lamellae: auricle distinct, moderately large, short, deep, triangu- 

 lar : dorsal angle sharp, anterior edge incurved. 2. W. Indies ? 

 This is probably a young shell but evidently distinct from the previous. 



M. Albina. Lam. 2. — Rumph. t. 47. B1 Whitish, obso- 

 letely scaly, with two constantly distinct ears : within pearly, 



1 Add likewise the A. Egyptiaca. (Mytilus Hirundo. var. 

 Egyptiaca. Chem. II. p. 252. /- 2018.9.— (M. Morio .JV. t. 12. 

 /. 13.) See also M. Tongana and M. Ovata of Quoy. {Astr. 

 voy. t. 77.) whose figures appear rather to be Aviculae than 

 Meleau rinse. 



