1,98 TURBO, TURBAN. 



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. 

 Witln'n the north wall, close to the bathing house, near 

 Dublin, are some acres of them, where neither the T. ru- 

 dis, 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 five, rounded, distinctly and deeply divided, 

 obscurely marked with a few spiral lines on the larger vo- 

 }ution ; 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 $ 

 breadth 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 i^ a gather carinated appearance ; the pillar- 

 lip smooth ; and the aperture somewhat margined. 



Trbo pallidus. Donovan, pi. 178. f. 4 Walker, f. 34. 



Western coasts, and Dublin bay. v. v. 



12. Turbo petrqeus, Rock Turban. 



Dorset Cat. pi. 18.f. 13, 



Helix petraea. 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 denned by 

 the line of separation, which in the junction of the body 

 volution with the next rises in a jagged or wrinkled man- 

 ner, irregularly wrinkled longitudinally, finely sloping to a 

 point, the first volution covering two-thirds of the shell j 

 aperture exactly oval, or pear-shaped ; the outer-lip thin 

 and sharp, and terminating rather pointedly at the top j 

 inside dark-chocolate brown. Our Irish specimens are 



nearly 



