488 CONID.E. 



The animal of vav. costaia is bluish- white (Mr. Clark 

 describes an example as " azure, shot Avith brilliant snow- 

 white streams"). The tentacula arc of moderate length, set 

 well apart at their origins, thickened to the prominent eye- 

 bulgings, which are at nearly or quite half their lengths, 

 thinner but clavate at their tips. The foot is truncate, 

 with obtuse angles in front, attenuated and lanceolate, but 

 rather obtuse behind. There is no trace of an operculum. 

 The animal of var. coarctata is opaque-white and rather 

 more obtuse caudally ; in all other respects identical. 



In one or other of its forms, this species is generally 

 distributed around the British coasts, and in many localities 

 is very plentiful. It ranges from five, or less, to fifty 

 fathoms, inhabiting stony and sandy grounds. As a general 

 rule, the form costata is commonest in the south, coarctata 

 in the north. It ranges from Sweden to the Mediterranean. 

 Its ancient history is not as yet very clear. 



M. ATTENUATA, MoutagU. 



Narrow fusiform, spirally lineated with brown, with about 

 nine longitudinal ribs on the principal turns, otherwise smooth, 

 and shining ; mouth filling about half the length ; canal elon- 

 gated ; labial sinus slight. 



Plate CXIII. fig. C, 9, and (Animal) Plato R. R. fig. 5. 



Murex attenuaius, Mont. Test. Brit. p. 2GG, pi. ,0, f. G. — Maton and Rack. 

 Trans. Linn. Soc. vol. viii. p. 143. — Turt. Conch. Diction, 

 p. 91. — DiLLw. Recent Shells, vol. ii. p. 742. — Wood, 

 Index Testaceol. pi. 27, f. 128. — Clark, Ann. Nat. Hist. 

 2nd Series, vol. vii. p. 125. 

 „ aciculatus, Lam. Anim. s. Vert. (ed. Desh.) vol. x. p. 610. 

 Fusus attenuaius, Fleming, Brit. Anim. p. 350. — Brit. Marine Conch, p. 203, 



f. 94.— Brown, Illust. Conch. G. B. p. 7, pi. 5, f. 37, 3){. 

 Pleuroloma Villiersi, Michaud, Bullet. Linn. Soc. Bordeaux, vol. iii. (1829), 

 p. 262, f. 4, 5 (teste Phil.).— Kiener, Coq. Vivant. 

 Plcurot. p. 80, pi. 27, f. 1. 



