MANGELIA. 455 



Murex chordttla, Turton, Conch. Diction, p. 94 (from type). 

 Fusus rufus, Fleming, Brit. Animals, p. 350. — Brit. Marine Conch, p. 204.— 

 Bkown, llhist. Conch. G. B. p. 7. — Gould, Invert. Massach. 

 p. 290, f. 192.— Dekay, New York Moll. p. 146, pi. 9, f. 189. 

 Fusus chordula, Fleming, Brit. Animals, p. 351. 



„ pkurotomarius, Couthouy, Boston Journ. Nat. Hist. vol. ii. p. 107, 

 pi. 1, f. 9. 

 rieurotoma nigra, Potiez and Mich. Gal. Douai, Moll. p. 446, pi. 35, f. 5, G. 

 Defrancia Vahlii, Beck in Moller Index Moll. Grcenl. p. 13, probably. 

 Fusus fuscus. Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 3, 4. 

 „ Cranchii, Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 5. 

 „ discors. Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 6, 7. 

 „ castaneus. Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 43, 44. 

 „ discrejians. Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 49, 50. 

 „ alius. Brown, Illust. Conch. G. B. p. 7, pi. 5, f. 62 ? 

 „ minimus. Brown, Illust. Conch. G. B. p. 6, pi. 5, f. 35, 36 ? ? 

 Pleurotoma Ulideatia, Thompson, Ann. Nat. Hist. vol. xv. p. 316, pi. 19, f. 2. 

 „ Vahlii, Reeve, Conch. Icon. vol. i. pi. 36, f. 332, probably. 



This species exhibits such diversity in shape (being at 

 times stnnted and broad, at other times narrow and pro- 

 duced), in the size, number, and diffusion of its ribs 

 (which are, as frequently as not, entirely or partially obso- 

 lete on the body-whorl, and are sometimes few coarse and 

 strongly projecting, sometimes finer rounded, or depressed, 

 and more frequent), and in the profundity and conspicuous- 

 ness of the spiral striae, that it has been greatly subdivided 

 by those writers whose opportunities of examining a large 

 number of individuals of each species have been inferior to 

 our own. 



The shell is more or less strong and opaque, and both 

 within and without of an uniform hue of brownish-purple, 

 chocolate, rufous brown, or tawny orange : the former is 

 the usual colour in living examples, but the dark hue 

 gradually fades into reddish brown, even in those indi- 

 viduals which have been captured thus richly painted. 

 Adult individuals are generally of an oblong-subfusiform 

 shape, and composed of from seven to seven and a halt 

 volutions, of which the final one is, on the average, equal 



