318 MURICIDiE. 



Sowerby, and referred to it the Murex variabilis of 

 Cristofori and Jan. The type of Leach's Fusus asper- 

 rimus, in the British Museum, is a specimen of the 

 white variety of T. mwricatus, having the ribs more 

 prickly than usual. 



2. T. Barvicensis"*, Johnston. 



Murex Barvicensis, Johnst. in Edinb. Phil. Journ. xiii. p. 225. T. Bar- 

 vicensis, F. & H. iii. p. 442, pi. cxi. f. 5,6, and (animal) pi. SS. f. 4, as 

 T. Barvicense. 



Body white, and microscopically veined or speckled with 

 chalk- white flakes: mantle thick: pallial tube very short : ten- 

 tacles cylindrical, rather short, widely diverging, with blunt 

 tips ; the upper third part is more slender, and the lower part 

 twice as thick ; they are flattened, as well as narrower, above 

 the eye-stalks : eyes small and black, placed outside the ten- 

 tacles, about two-thirds of the way up, at the top of stalks, 

 which are amalgamated with the tentacles and appear to form 

 part of them : foot extensile, double-edged and nearly square 

 in front, becoming narrower behind, and ending in a rounded 

 or bluntly pointed tail ; the front corners are slightly auricled 

 or angular. 



Shell resembling the last species in many respects ; but 

 this is broader, more delicate and glossy ; the longitudinal 

 ribs are much fewer (about two- thirds of the number), more 

 laminar, prominent, and flounce-like ; they extend to the 

 suture ; the spiral ridges are numerically in the same propor- 

 tion as the ribs ; the top of each whorl is encircled by an 

 elegant coronet of spines : colour pure white : spire distinctly 

 scalariform or turreted : mouth more triangular, and narrower : 

 canal rather straighter : outer lip sometimes upturned at the 

 upper corner of the mouth, which ends in a sharp point : pillar 

 straighter : operculum of a paler colour, thinner, and smoother. 

 L. 0-65. B. 0-25. 



Habitat : Stony ground in the laminarian, coralline, 

 and deep-water zones, on the coasts of Yorkshire, Nor- 

 thumberland, Durham, Berwick, Aberdeenshire, the 

 west of Scotland, the Orkneys, and Shetland; Cork, 



* From the ancient name of Berwick-on-Tweed. 



