298 JOURNAL or CONCHOLOGY, VOL. I3, NO. 10, APRIL, I912. 



Monterosato's note, " the British form is different."^ The large one 

 is well figured by Sowerby and by Forbes and Hanley ; Brown 

 describes the small one as Fusus boothii^ and his figure can mean 

 anything ; while Jeffreys describes the Hebridean form, but figures 

 the minor or southern one, and incorrectly depicts the aperture as 

 furrowed or grooved ; it should be plain. The small form resembles, 

 especially in the sculpture, some specimens of C. linearis var. 

 ifitermedia, and it also includes another form known as var. coiicinna 

 Scacc, in which the spirals are much fewer and wider apart; but in 

 all the variations of C. leiifroyi the spire is shorter, the whorls more 

 tumid and rapidly enlarging, than in C. linearis, the longitudinal ribs 

 are usually more curved, and it never has the aperture denticulated. 

 A specimen from Barra has only half the usual number of ribs, and a 

 dwarf from Scilly, with a more slender spire, does not exceed a 

 quarter of an inch. Although Gwyn Jeffreys says that C. linearis is 

 "very much smaller than C. leufroyi," specimens will be met with 

 quite the reverse of this. 



C. linearis Mont. — Under stones, as well as in weeds of rock- 

 pools, at very low water on our Southern and Irish coasts. The 

 sculpture of this species is muricated or prickly, and the shell is 

 coloured more or less with purple streaks and stains, the topmost 

 whorls being usually purple, but sometimes yellowish ; ground colour 

 flesh-pink or yellowish-brown. The lip is furrowed inside with a 

 dozen ridges, the bottom one being strong and prominent, and the 

 upper one developing at maturity into a still more prominent tubercle. 

 L. o-35in., b. 015. 



Var. intermedia F. and H. — Yellowish-white to yellowish-brown, 

 with rounded ribs and spiral brown lines, apex never purple. L. 

 o"4in., b. o'ly. Dredged in the coralline zone nearly everywhere. 



Var. pallida F. and H. = var. cequalis Jeff. — Smaller, thinner, 

 finely and more equably sculptured, colourless or with the spiral 

 lines pale brown. L. o'3oin., b. o'l. Dredged on fine sandy ground, 

 not common. This is considered a northern variety, but is also found 

 south, and in comparative plenty at the Scilly Islands. It is usually 

 more oblong than the type, in consequence of the last whorl being 

 little wider than the penultimate ; but it has as many gradations in 

 shape and sculpture as the type form. Occasionally the longitudinal 

 ribs are obsolete, especially on the body-whorl, and spirals are the 

 rule. This variety has some of the features of C. gibbera Jeff., but 

 the embryonic whorls are essentially different. 



Var. alba MdLr?,\\.,/ourn. of Conch., 1893, vol.vii., p. 262. — Guernsey, 

 Scilly, Land's End, Aberdeenshire, Toch Boisdale 3of. This is 



I, Nomen. Gen. e Sp., p. 134. .' . ' ' . 



