432 MURICID.^. 



below, where a distinet siphoiial fold crowns the rndinien- 

 tary beak. The aperture is slightly surpassed in length by 

 the spire, is devoid of sculpture, and of a more or less oval 

 shape, that is angulated above, and not much attenuated 

 below, where it terminates in a rather open canal. The 

 less exposed portion of the throat is of a reddish-brown in 

 the young, and changes to purplish-brown in the more 

 aged examples : towards the outer lip, however, it is, as is 

 likewise the not much spread enamel of the inner lip, of a 

 pure white. The outer lip, which does not recede much 

 anteriorly, and usually juts out from the body at nearly a 

 right angle to the left lip, is thickened, expanded, and 

 prominent : it runs at first in a straightish or sub-retuse 

 line, is somewhat perpendicular and convex in the middle, 

 and slants towards the axis below with but little convexity 

 and hardly apparent rostral sinuation. The course of the 

 inner lip is peculiar, being but little concave in the middle, 

 and slanting to the right anteriorly. The columella is 

 solid, much twisted, somewhat rounded, and provided with 

 a distinctly reflected pillar lip. The operculum is large 

 and pyriform (King). An eight whorled specimen that 

 was five inches in length, measured two inches and three- 

 eighths in breadth ; another of nearly five inches and 

 a-half in length, measured only two inches and a-sixth at 

 the broadest part. 



Mr. Howse has drawn up the following account of the 

 ova-capsules, from three examples fished up on the Nor- 

 thumbrian coast : — " They differ completely from those 

 of F. Norvegicus in shape, in being double, in number of 

 embryos, and in mode of attachment ; but agree with them 

 in being solitary. They are ovate, compressed, lentiform, 

 and are supported on a short flattened peduncle. This 

 peduncle is a production of part of the margin of the 



