TURBO. TURBAN. 213 



49. Turbo marginatus. Margined Turban* 



Laskey, Wern. Soc. i. pi. 8. f. 13. 



Shell somewhat cylindrical, very strong, white, obtuse : 

 spires six, with numerous longitudinal ribs which are con- 

 tinued over the separating line, and finely striate circularly : 

 aperture oval ; the outer-lip extremely thick, and rounded 

 by a rib at the back : length three-eighths of an inch ; 

 breadth a fourth of its length. 



It differs from T. reticulatus, in its size and much more 

 slender shape, and in the longitudinal ribs crossing the line 

 of junction. 



At Guernsey : very rare. 



50. Turbo striatus. Striated Turban. 



Linn. Tram. iii. pi. 13. f. 25, 26 mMer, f. 49. 



Shell cylindrical, slender, often elongated and curved, 

 moderately pointed, transparent, glossy- white, with often 

 pale ferruginous marks, sometimes entirely of a pale rust 

 color, covered when fresh with a brown skin : spires six, 

 rounded and well defined by the separating line, covered 

 with numerous extremely fine transverse striae, which are 

 sometimes worn down so as to give the shell a polished ap- 

 pearance, and faintly ribbed longitudinally on the upper 

 part of some or all the volutions, which often form a slight 

 bead- work round the line of junction : aperture roundish- 

 oval, margined ; the outer-lip thin ; inner-lip not reflected : 

 length above the tenth of an inch ; breadth a third of its 

 length. 



On sea weed, and in drifted sand. v. v. 



51. Turbo coniferus. Conic Turban. 



Montagu, pi. 15. f. 2 Dorset Cat. pi. 19. f. 6. 



Shell white, strong, taper, rather obtuse at the point : 

 spires six, fiat but well defined by the separating line, with 

 about twelve strong undulate longitudinal ribs, which at 

 the junctions of the volutions have small cavities between 

 them, giving the line of separation a denticulate or slightly 

 beaded appearance, and continuing circularly round them ; 

 the ribs crossed by very fine transverse striae : aperture 

 oblique, oval, strongly margined, not reflected at the pil 



lar ; 



