The natural history of British shells, including figures and descriptions of all the species hitherto discovered in Great Britain .. . dled. Mactra solid a : testa opaca lasviuscula subantiqua. Gmel. Linn. Syst. Nat. p. 3259. sp. crassa, ex altera parte compressa, ex altera subrotunda. List. II. Ah. Angl. p. 174. tit. 24. tab. 4. fig. 24. —Pectunculus crassiusculus albidus. List. H. Conch, tab. fig. media fasciata crassa Petiv. Gaz,. tab. 94. fig. minor plurimis fasciis. Id. ib. fig. Pectunculus with azurine circular lines interpolated. Leigh. Lancashire,
The natural history of British shells, including figures and descriptions of all the species hitherto discovered in Great Britain .. . dled. Mactra solid a : testa opaca lasviuscula subantiqua. Gmel. Linn. Syst. Nat. p. 3259. sp. crassa, ex altera parte compressa, ex altera subrotunda. List. II. Ah. Angl. p. 174. tit. 24. tab. 4. fig. 24. —Pectunculus crassiusculus albidus. List. H. Conch, tab. fig. media fasciata crassa Petiv. Gaz,. tab. 94. fig. minor plurimis fasciis. Id. ib. fig. Pectunculus with azurine circular lines interpolated. Leigh. Lancashire, tab. 3. fig. white striated Chama. IVallis Northum. p. 395. PLATE LXI. Mactra solida ; strong. Penn. Br. Zool. No. 43. tab. 51. fig. 43. A. et tab. 52. fig. 43.—Chemnitz. Conch. 6. t, 229. crassa transversim fasciata. Zonaria. Da Costa. Br. Conch, tab. 15. fig. 1. 1. This species is found on many of our shores, as Kent, Dorsetshire,Lancashire, Yorkshire, Northumberland, the coast of Wales, &c. The girdles are most prominent in the dead shells; the surface be-tween them appearing much worn. 61.
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