TURBO. TURBAN. 215 



gitudinal ribs running rather obliquely, each of which has 

 a groove down the middle, giving them an appearance of 

 being doubled, and very finely striate transversely, chiefly 

 between the ribs : aperture nearly orbicular; the'outer-lip 

 a little dilated, bordered by a strong prominent rim which 

 has a groove in the middle of it ; and at the inner angle 

 of the aperture, near the junction of the first and second 

 volutions, is a ridge running transversely backwards, and 

 turning downwards, till it joins the margin of the lip be- 

 hind ; this ridge is bordered by a fine depressed line at the 

 end where the longitudinal ribs terminate ; length the 

 eighth of an inch ; breadth a third of its length. 

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



55. Turbo parvus. Small Turban. 

 Walker, f. 43 Dorset Cat. pi. 1.9. f. 4. 



Turbo subluteus. Linn. Trans. \\i. pi. 13. f. 15, 16. 



Turbo aereus. Linn. Trans, iii. pi. 13. f. 2.9, 30. 



Turbo lacteus. Donovan, pi. 90. 



Shell strong, conic, opake, white, ches nut-brown, or pale 

 rufous, sometimes spotted, or dark brown with white ribs: 

 spires six or seven, rounded and well defined, with about 

 twelve strong obtuse equidistant ribs, which sometimes run 

 the whole length of the shell, sometimes down one or two 

 of the larger volutions, and frequently along the lesser vo- 

 lutions only, and have occasionally the appearance of beino- 

 grooved down their middle ; the "interstices between them 

 quite smooth : aperture roundish ; the outer-lip thickened 

 by a rib ; inner-lip a little reflected, but not perforated be- 

 hind the middle : length the eighth of an inch breadth 

 not half its length. 



On the leaves, and among the roots of Fuci. v. v. 



56. Turbo indistinctus. Indistinct Turban. 

 Montagu, Suppl. p. 121). 



Shell somewhat cylindrical, obtuse, glossy-white : spires 

 five or six, nearly flat, but well defined by the separating 

 line, finely striate longitudinally, and punctured in the In- 

 terstices, observable only when much magnified, but not 

 crossing the longitudinal ridges: aperture inclining to 

 oval ; pillar-lip smooth and a little spread : length the 

 tenth of an inch 3 breadth a third of its length. 



It 



