330 TROCHID.E. 



It is the T. papiUosus of Da Costa, T. fragilis of 

 Pulteney (but not of Gmelin), and T. tenuis of Montagu. 

 Born^s publication bears the same date (1778) as that 

 of Da Costa ; the name given by the former is generally 

 preferred or best known. 



15. T. zizY'PHiNUS^, Linne. 



T. zizyphinus, Linn. S. N. p. 1231 ; F. & H. ii. p. 491, pi. Ixvii. f. 1-6. 



Body yellowish, tinged with purple or crimson, and streaked 

 or mottled with reddish-brown : mantle plain-edged ; lappets 

 as in T. r/ramdatus, but not scalloped : head large, prominent, 

 and flexible, wrinkled transversely ; veil bilobed, but so smaU 

 as to be almost rudimentary: tentacles sometimes pinkish, 

 more or less distinctly streaked with a brown line down the 

 middle : eyes rather large and prominent, with black pupils ; 

 stalks short, stout, and often white : foot thick and rather 

 broad, slightly cloven in front and angulated at the corners, 

 pointed behind ; sole fleshcolour ; crest fringed : appendages 

 ^ on each side, and in some specimens several short inter- 

 mediate ones ; they are mostly white. 



SuELL regularly pyramidal, with a level outline and a some- 

 what flattened or compressed base, solid, opaque, slightly 

 glossy : sndpture, from six to eight concentric and imbricated 

 ridges, besides as many smaller intermediate ones, on the upper 

 part of the last whorl, and about a dozen grooves or impressed 

 lines on the base ; the preceding whorls have similar ridges, 

 which gradually decrease in number towards the apex ; the 

 ridge which girds the base of each whorl is larger and broader 

 than the rest, and gives the periphery an angulated appear- 

 ance ; the ridges on the upper whorls are granulated ; the 

 entire surface is covered with very minute and close-set, but 

 obscure, oblique longitudinal strite : colour pale yellow with 

 a reddish tint, or fleshcolour (sometimes purple, flecked with 

 white), with longitudinal streaks of reddish-brown, which 

 are mostly interrupted or zigzag, and frequently mark each of 

 the basal ridges with a Hue of spots ; the underside of the 

 shell is not thus decorated, except at the periphery; the apex or 

 point is usually pui^plish : spire more or less raised, and tapering 



* From the resemblance of its colour to that of the jujube. 



