197 
P. Linearis. Turton.— Murex L. Mont. p. 261. ¢. 
t.9.f. 4.—Lin. T.8. p. 148.—D. p. 745.—Fusvus L. 
F, p. 850.—M. Exxecans. Don. t. 179. f. 3.—Subfu- 
siform, turreted ; whorls seven or eight, rounded, light 
brown, with nine or ten ribs crossed by elevated striae or 
ridges, the summits of which are purplish brown and 
form fine spiral thread-like lines (the ridges are rarely 
uniform brown) up to the acute and dark (usually pur- 
ple) apex; aperture oval, terminating in a straight 
canal, outer lip thickened at the back by a rib, inner 
margin crenated. %...8. Devon and Cornwall. 
P. CHorputa. Turton.—Morex C. Turt. D. p. 
350.—Fusus C. F. p. 350.—Conic, brown, a little 
tapering to a rather obtuse point; whorls five; rounded, 
the body occupying more than half the length ; spirally 
striated and adorned with fifteen wire-like contiguous 
ribs which bend in the middle towards the outer lip 5 
aperture narrow oval, ending in a short canal; outer 
lip thickened externally py arib. 0,17...0,06. Drifted 
sand, Dublin Bay. 
P. TReEvELLIANUM. Turton. in Mag. Nat. Hist. 
7. p. 390.—Macg. Aberd. p. 172.--Oval, fusiform, 
yellowish white, with six or seven volutions which are 
very closely striated and flattened at their tops; mouth 
