SAXICAVA. 141 



1. S. ARCTicA, Linnseus. 



Anterior extremity attenuated and cuneiform, witli a lunule- 

 like excavation in front of the prominent beaks ; posterior extre- 

 mity always the broader; ligamental edge ahnost always incurved; 

 linear ridges spinous except in very aged individuals ; hinge 

 toothed. 



Plate VI. figures 4, 5, 6. 



Mya ardica, Linn. Syst. Nat. p. 1113. — 0. Fabr. Fauna GrEenl. p. 407. — 



TuKT. Conch. Diction, p. 104. — Wood, General Conch, p. 95. 

 Solen minidus, Linn. Syst. Nat. p. 1114. — Mont. Test. Brit. p. 53, pi. 1, f. 4. — 

 Spengl. Skrivt. Naturh. Selskab. vol. iii. part 2, p. 1 13. — Linn. 

 Trans, vol. viii. p. 47- — Turt. Conch. Diction, p. 161. — Chemn. 

 Conch. Cab. vol. vi. p. 67, pi. 6, f. 51, 52.— Wood, General 

 Conch, p. 139, pi. 34, f. 5, 6. — Dillw. Recent Shells, vol. i. p. 

 69. — Lam. Anim. s. Vert. ed. 2, vol. vi. p. 57. — Index Testa- 

 ceol. pi. 3, f. 33. 

 Donaoc rUomluules, PoLi, Test. Sicil. pi. 15, f. 12, 15. 

 i1/^;i7?<sjO)wc/s«s, Mont. Test. Brit. p. 165. — Linn. Trans, vol. viii. p. 112. — • 



DiLLW. Recent Shells, p. 305. 

 Hiatdla ardica. Lam. Anim. s. Vert. ed. 2, vol. vi. p. 443. — Flem. Brit. Anim. 

 p. 461. — Brit. Marine Conch, p. 59. — Bowdich, Conchology, 

 Biv. f. 40. — Crouch, Introd. Conch, pi. 8, f. 6. — Hanl. 

 Recent Shells, p. 150. — Cuvier, R. Anim. (ed. Croch.) pi. 

 110, f. 1. 

 Anatina Ardica, Turt. Dithyra Brit. p. 49, pi. 4, f. 7, 8.— Brit. Mar. Conch, p. 42. 

 Affina piirjmi-ea, Turt. Dithyra Brit. p. 54, pi. 4, f. 9. — Brit. Marine Conch, p. 60. 

 Solen purpureas, Flem. Brit. Anim. p. 459. 

 Saxicava rhomboidcs, Desh. in Lam. ed. 2, vol. vi. p. 153. 



Saxieava arctica, Desh. Elem. Conch, pi. 12, f. 8, 9. — Phil. Moll. Sicil. vol. i. p. 

 20, pi. 3, f. 3, and vol. ii. p. 19.— Macgill. Moll. Aber. p. 

 285. — LovEN, Ind. Moll. Suecire, p. 40. 

 Hiatdla minutu, Turt. Dithyra Brit. p. 24, pi. 2, f. 12. — Brown, 111. Conch. G. 



B. p. 103, pi. 47. f. 1, 16. 

 Saxicava purpurea. Brown, 111. Conch. G. B. pi. 42, f. 30, 31. 

 Saxicava rubra, Desh. Exp. Alg^rie, Moll. pi. 66, f, 18, 19 (shell and animal). 

 Hialelle, Chenu, Trait6 Element, p. 58, f. 206. 



Nothing but the most searching scrutiny will distinguish 

 this closely allied Saxicava from its congener rugosa, the 

 young of which is often confused in cabinets with that of 



