442 MURICIDiE. 



T. Barvicensis, Johnston. 



Snow-white, with about twelve longitudinal lamellfc that are 

 fimbriated by inconspicuous spiral costella^ ; whorls abruptly 

 scalar. 



Plate CXI. fig. .5, G, and (Animal) Plate S. S. fig. 4. 



Fiisus Barvicensis, Johnston, Edinb. Phil. .loum. vol. xiii. p. 221 ; Berwick. 



Club, vol. i. p. 235.— Fleming, Brit. Anim. p. 351. — Brit. 



Marine Conch, p. 20G, f. 2. — Reeve, Conch. Iconica, vol. iv. 



pi. 21,f. 8G. 

 Tritonium Darvieensc, Loven, Index Moll. Scandin. p. 12. 



Thi-s very beantifnl shell most closely approaches the 

 preceding species. It is always, however, both within and 

 without, of a pure snow-white, and in place of a nodose 

 decussation of more or less close and numerous longitu- 

 dinal .sublamellar ribs, by equally prominent revolving 

 costellre, is armed lengthways with highly elevated and 

 rather distant reflected lamella (rarely above twelve in 

 number on any of the volutions), which are fimbriated by 

 comparatively obsolete and somewhat remote spiral cos- 

 tellre, and are usually raised posteriorly in a curved lance- 

 olate prickle, so as to coronate, as it were, the angulatcd 

 edge of the abruptly scalar volutions, which from this 

 circumstance, perchance, appear broader there than at 

 their lower suture. The body and tail (on which latter 

 the lamella) are scarcely developed) seem slightly shorter 

 in proportion to the spire than in muricatus, to which, 

 both in size and other respects, there is the strongest 

 resemblance. 



The animal is entirely white. The form of its head and 

 tentacula much more closely resembles that of claiJiratus 

 than of muricatus. The tentacula are rather short, thick, 

 and obtuse. The foot is short behind, and not much pro- 



