329 



T. with a ftrong, fmooth, fub-pellucld, fub-conlc 

 fhell, with four vohitions ; the firfl very large, occupy- 

 ing more than half the fhcll : colourwhite, ufually mark- 

 ed with four faint brown bands on the body, and fome- 

 times two on the fecond fpire ; others have the band^ 

 united, and form two very broad ones on the firfl: fpire i 

 apex rather obtufe : aperture .fub-orbicular, thickened 

 within, but floped to a fliarp edge on' the outer hp ; pil- 

 lar lip broad, with a fmall groove ending in an umbilicus. 

 Length rarely a quarter of an inch ; breadth one eighth. 



A variety is quite white ; but thofe are old and worn 

 fhells ; many appear plain white until carefully examin- 

 ed, when the faint bands may be traced. Live (hells are 

 darkeft, and fometimes tinged with green. This fpecies 

 has fomewhat the habit of T. canalis, but is at once dif- 

 tinguifhed by the thick outer lip; it never grows to half 

 the fize, is much flronger, more opaque, and at the bafe 

 of the lower volution this has always an angulated ap- 

 pearance, or is fub-carinated ; whereas the other is per- 

 feftly rounded at that part. 



We found this fhell plentiful at Falmouth, amongR 

 fand from the harbour : and alfo on the fouth coaft of 

 Devon, particularly on the fhore of Salcomb bay at low- 

 water, inhabiting algce. 



Turbo interruptus. Lin, Trans, v. p. 3.1.1. f. 16.17. f^4.7.//A'j-^IxTrRRui>TUs, 

 Turt, Lin. iv. p. 500. 



V V T. witli 



