"250 TESTACEOUS MOLLUSCA. 



*M. Edulis. Lin. Sys. \\57.—Fab. Faun. Gr.~D. p. 309. — 

 Lam. 29.— Tart. Die. p. 109.— Dor. Cat. t. 12. /. 5.— Da. Cost. t. 

 15./. 5, (left hand figure)— Ch. /. 750.— Knorr. 4. t. 15. /. 1.— 

 E t. 218./. 2—Macg. Ab. p. 234.— W. t. 12. /. 22. (not good)— 

 Don. t. 128. / 1. Oblong, convex, nearly smooth, dark blue 

 (sometimes with paler rays) hinge margin short, convex, forming 

 a rounded oflfbut evident angle with the anterior, which is but little 

 arcuated, and subparallei to the posterior, the latter being nearly 

 straight and slightly tumid towards the rather acute beaks ; the 

 base (or anterior ventral edge very obtuse): hinge with a few 

 denticles. 



Variety ? M. Pellucidus. Pen. 4. t. 63. / 73. (tolerable) — 

 D. p. 310.— Don. t. 81.— Ch,f. 755. (tolerable)— W. t. 12. f. 22. 

 — Mont. p. 166. Tawny, with blue rays, pellucid, the dorsal angle 

 more distinct. 



Far. M. Incurvatus. Pen. 4. t. 64./. 74. — Lam. 33. — W. t. 

 12. / 48. — Lin. Tr. 8. t. 3. f. 7. So distorted that the back is 

 greatly arched, the posterior edge strongly incurved and the base 

 dilated. 2. The common mussel. N. IV. Europe. l 



M. Hesperianus. Lam. 32. — List. t. 302. / 202? — Payr. 

 Cat. p. 68. t. 2. /. 5. Narrow, oblong, the sides nearly equal, 

 rounded at the margin, dark blue with the beaks white, acute and 

 somewhat curved : hinge with the teeth obsolete. 1|-. — Spain. 

 I believe this is only a variety of Edulis. 



M. Conftjsus. Ch. f. 753!— M. Lineattjs Gmel. 3359.— TV. t. 

 12. / 27.— D. p. 212.— E. t. 218. / 4. Oblong- triangular, 

 dilating from the apex, of a dirty yellowish green with oblique 

 impressed lineoles decussating the transverse striae : pearly within 

 and the hinge with two teeth. ^. — Adriatic near Venice. 



M. Lactjnatus. Lam. 35. Incurved, dilated at the opposite 

 extremity to the beaks which are acute : the middle of the posterior 

 side indented with a hollow, f. — Australia. 



M. Minimus Poll. 2. t. 32. /. 1. — Desk, in Lam. 7. p. 49. — 

 Payr. p. 69. — Phil. p. 73. Small, elongated, narrow, arched in 

 the middle, gibbous on the back, obliquely subcarinated, brown or 

 violet blue, and finely striated concentrically ; umbones minute 

 and not quite terminal. Mediterranean. According to M. Chant' 

 eraux is a diseased Edulis. 



M. Polymorphus Pallas.—Gmel. 3363.— W. S. t. 2. / 6.— 

 Reeve, t. 102. / 4. — Sow. G. f. 4. — Dreissena. P. Gray. Turt. 

 p. 301. — (Ch.j. 2028.) Triangular, inflated, smooth, carinated : the 

 posterior face flat, concave, with a cleft for the byssus in the centre; 

 yellowish olive with transverse ziczac stripes : within white and not 



1 M. Deshayes states that the M. Abbreviatus. and Retusus 

 (Del. t. 14./. 1.) Lam. 30, 31. are varieties of this species. 



