TURBO. TURBAN. 
198 
It may also be observed, that this rare species is only 
found in swampy marshes which have a communication 
with the tide at high water, and the adjacent ditches. 
Within the north wail, close to the bathing- house, near 
Dublin, are some acres of them, where neither the T. ru- 
Jis, nor any other species of shell is ever found, and where 
they cover the mud and stones in vast profusion, v. v. 
1 1 .< Turbo crassior, Thick 'Turban , 
Montagu , pi. 20. f. 1. 
Shell thick, strong, conic, opake, pointed, yellowish- 
white, mostly covered with a yellowish-brown wrinkled 
skin : spires live, rounded, distinctly and deeply divided 
obscurely marked with a few spiral lines on the 'larger vo¬ 
lution ; inside white: aperture somewhat orbicular: pillar- 
lip white, sometimes wrinkled, with often a slight ten¬ 
dency to a groove and perforation: length half an inch* 
]3readtli nearly a quarter. 
Its outline is very much like that of the T. vinctus, but it 
is of thicker consistence, wider in proportion to its length 
and wants the pillar-groove and perforation. 
Variety. With a slight spiral line or two on the body vo¬ 
lution, giving it a rather carinated appearance ; the pillar- 
lip smooth ; and the aperture somewhat margined. 
Turbo pall id, us. Donovan, pi. 1J8. f. 4— Walker , f. 34. 
Western coasts, and Dublin bay. v. v. 
12. Turbo petrseus. Rock Turban . 
Dorset Cat. pi. IS. f. 13. 
Helix petrosa. Montagu , p. 403. 
Shell conic, opake, dark-purplish brown with often irre¬ 
gular whitish marks and lines, especially on the outside of 
the pillar : spires five, hardly raised, but well defined bv 
the line of separation, which in the junction of the body 
volution with the next rises in a jagged or wrinkled m?n- 
rrnr, irregularly wrinkled longitudinally, finely sloping to a 
poir*t, the first volution covering two-thirds of the shell • 
aperture exactly oval, or pear-shaped ; the outer-lip thin 
and sharp, and terminating rathpr pointedly at the top • 
;nside dark-chocolatq brovvn. Our Irish specimens are 
nearly 
