Tckritella. MOLLUSCA. PECTINIBRANCHIA. 303 



Length 2§ inches; white, purple, or variegated with brown ; whorls raised, 

 deeply divided by the separating line. Lister seems to have been acquainted 

 with this shell as British; afterwards Da Costa obtained it from the coasts of 

 Lincoln and Lancashire ; Montagu I'eceived it from Kent. 



216. T. duplicata. — Whorls about fourteen, and spirally 

 striated, with two acute spiral ridges. 



Buccinum crassum, List. An. Ang. 100. t. iii. f. 7- Conch, t. Dxci. 59. — 

 Turbo dup. Linn. Syst. i. 1239. Penn. Brit. Zool. iv. 129. t. Lxxxi. f. 

 112. Don. Brit. Shells, t. cxii. Turton, Conch. Diet. 216 — English 

 coast, rare. 

 Length about 2h inches, thick, heavy, of a brownish colour; the two ridges 

 are of unequal size This species was obtained by Lister from the Scar- 

 borough fishermen ; and Dr Turton announces that it was " said to have heen 

 lately discovered on the western coasts by Dr Leach." 



217. T. subtruncata. — Whorls about seven, rounded, and 

 obscurely striated spirally. 



Turbo sub. Mont. Test. Brit. 300. t. x. f. 1. — In sand, rare. 



Length about T %ths of an inch ; white; whorls from five to seven, and (in 

 a specimen in my possession) gradually tapering to an obtuse point ; outer lip 

 rounded ; pillar-lip nearly straight, a little reflected, so as to form a small ca- 

 vity behind. 



- 218. T. clegantissima. — Whorls ajbout ten, flat, with numer- 

 ous regular transverse grooves. 



Turbo turritus novem anfractibus striatis apertura rotunda, Walk. Test. 

 Min. ii. t. ii. f. 39 — Turbo eleg. Mont. Test. Brit. 298. t, x. f. 2 In 



deep water, not common. 



Length about T 3 5 ths of an inch, breadth about |th of its length ; colour of 

 the shell white, glossy ; of the epidermis brown ; ridges and grooves rounded, 

 slightly oblique, separating line distinct ; outer lip slightly rounded ; pillar- 

 lip nearly straight, thick, forming a slight angle anteally. It is a very strong 

 shell in proportion to its size. 



219- T. truncata. — Whorls four or five, flat, decreasing sud- 

 denly ; apex abrupt. 



Turbo trim. Mont. Test. Brit. 300. t. x. f. 7 Common. 



Length about T 2 D ths of an inch ; white, glossy ; whorls nearly six in num- 

 ber, deeply divided by the separating line, and faintly striated transversely ; 

 aperture ovate ; pillar-lip slightly rounded, and a little reflected. 



220. T. unica. — Whorls nine, finely striated spirally, with 

 numerous undulated transverse ridges. 



Turbo turritus septem anfractibus strigatis apertura ovali, Walk. Test. 

 Min, ii. t. ii. f. 40 — Turbo unicus, Mont. Test. Brit. 299. t. xii. f. 2 — 

 Among shell-sand, rare. 



Length about T 2 5 ths of an inch ; white, glossy, slender ; whorls rounded and 

 deeply divided by the separating line ; aperture ovate ; the pillar-lip rounded. 



221. T. simlU'ima. — Whorls eight, with fourteen distant 



ridges parallel with the axis of the shell. 



Laskey, Mont. Test. Brit. Supp. 136. Wern. Mem. i. 406. t. viii. f. 15. 

 — Shores of Jura. 



