472 CONIDiK. 



measured from tlie posterior edge of the outer lip, occupies 

 about three-sevenths of the total length, and is of a sub- 

 oval form, that is produced below in a somewhat curved 

 and not very short canal : its size is narrowed in adult ex- 

 amples by the thickening of the outer lip, which latter is 

 much arcuated, the swell ceasing abruptly in front at 

 the commencement of the beak. The labial sinus is small 

 and only perceptible in mature individuals ; it is not 

 usually so conspicuous or profound in our native as in 

 Mediterranean examples. The mouth is sometimes white, 

 but more frequently is stained with purple, either wholly 

 or partially. The throat is guarded by some tubercular 

 crense (occasionally produced in short lyraj), but these are 

 often indistinct ; when perceptible, there seems a group of 

 about seven small approximate ones, and a larger solitary 

 one just below the posterior sinus. The pillar is more or 

 less rounded, straightish, and somewhat elongated. No 

 violet or purple adorns the mouth or apex of the variety 

 intermedia ; where the sculpture is not so rugged, the ribs 

 being more delicate and rounded (usually, too, more 

 numerous), and the threads, which are almost uninter- 

 ruptedly brown, rather closer and finer. The whorls are 

 still more rounded, hence the general shape is somewhat 

 abbreviated : the mouth broader, and the canal shorter. 

 The variety imllida is essentially northern : it is more 

 or less devoid of colouring, has still finer closer and less 

 elevated sculpture, and is even more produced in shape 

 than the richly tinted and prickly southern variety. 



The larger examples measure five lines and a half long, 

 and two lines and a half broad. 



The animal is entirely white. The tentacula are sub- 

 ulate, linear, and obtuse : the eyes are placed on their 

 thickened portions, at rather more than a third of their 



