250 SOLENID.E. 



S. Kxsis, Linnaeus. 



Resembling ^S". sillqua, but arcuated, and generally more slender. 



Plate XIV. fig. 2. 



Solen ensis, Linn. Syst. Nat. p. 1114. — Penn. Brit. Zool. ed. 4, vol. iv. p. 84, 

 pi. 45, f. 22. — Da Costa, Brit. Conch, p. 237. — Pulteney, 

 Dorset, p. 28.— DoNov. Brit. Shells, vol. ii. pi. 50.— Mont. Tes 

 tac. Brit. p. 48. — Linn. Trans, vol. viii. p 44. — Turt. Conch. Die 

 tion. p. 1 60, f. Gl ; Dithyra Brit. p. 82.— Flem. Brit. Anim. p. 459 

 — Macgill. ]\Io11. Aberd. p. 282.— Brit. Marine Conch, p. 35.— 

 Brown, 111. Conch. G. B. p. 113, pi. 47, f. 10.— Chemn. Conch 

 Cab. vol. vi. p. 47, pi. 4, f. 30 and C— Poli, Test. Sicil, pi. 11 

 f. 14. —Wood, General Conch, p. 122, pi. 28, f. 1, 2.— Dillw 

 Recent Shells, vol. i. p. 59. — La.^iarck, Anim. s. Vert. (ed. Desh.) 

 vol. vi. p. 55. — Index Test. pi. 3, Solen, f. 6. — BtrRROWS. Conch 

 pi. 4, f. 3, 4. — Philippi, Moll. Sicil. vol. i. p. 4, and vol. ii. p. 5 

 — Sowerby, Conch. Manual, f. 60. — Hanl. Recent Shells, p 

 11.— Desh. Exp. Scien. Alger. Moll. p. 184, pi. XI. f. 1, 4 

 (animal). 



Solen Sabre, Chenu, Traite Elem. p. 41, f. 126, and pi. 1, f. 1. 

 Encycl. Method. Vers, pi. 223, f. 2. 



The description of slliqua is so nearly applicable to the 

 present species, that it is only necessary to particularize 

 those few points of difference by which they may be dis- 

 tinguished from each other. 



Of these, the most readily perceptible is the decided 

 arcuation of the valves in ensis, which typically, likewise, 

 is far more slender in jiroportion, the length of ordinary 

 individuals being eight times their breadth. The anterior 

 extremity, moreover, is not truncated but rounded, whereas 

 in characteristic examples of the preceding species, the 

 convexity of the front margin is so trifling as scarcely to be 

 noticeable. The posterior side is likewise a little tapering 

 near its termination. The colouring matter is perhaps of a 

 browner tint, and the epidermis, which, as in slliqua, is 

 transparent and colourless upon the diagonally-partcd-ofF 



