330 



TROCHID^:. 



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

 Pulteney (but not of Gmelin), and T. tennis 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. 



Co4tio sterna, 



.l>3- 15. T. ZIZY'PHINUS 



2 1 . 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. granulatus, but not scalloped : head large, prominent, 

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

 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 

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

 mediate ones ; they are mostly white. 



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

 what flattened or compressed base, solid, opaque, slightly 

 glossy : sculpture, 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 striae : 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 line of spots ; the underside of the 

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

 point is usually purplish : spire more or less raised, and tapering 



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



