422 MURICID^. 



aiitl is both encircled tlirougliout with narrow prominent 

 cord-hke costella?, and traversed lengthways by very closely 

 disposed and somewhat slanting raised wrinkles. The 

 former, of which there are generally six on each of the 

 principal turns of the spire, and which are very numerous 

 on the body- whorl, on whose lower half they become 

 less elevated (elsewhere they are about equal in pro- 

 jection), are separated from each other by broad intervals, 

 with, for the most part, on the larger turns, an inter- 

 vening spiral thread or raised stria ; both cords antl threads 

 are crossed and geniculated by the ridge-like wrinkles. 

 Four-sevenths of the dorsal length is occupied by a spire, 

 composed of eight ventricose whorls, which, although 

 merely separated by a fine suture (of moderate obliquity), 

 are very distinctly defined, being more rounded belo\v, 

 more flatly shelving and taper above ; they are of mo- 

 derate height, and of rather quick longitudinal increase ; 

 the apical coil is blunt, regularly spiral, and very de- 

 pressed. The body is somewhat pear-shaped ; it is occa- 

 sionally, if not always, a little retuse near the suture, 

 is ventricose posteriorly, and rather abruptly attenuates, 

 with a moderate and convex basal declination, to a gently 

 recurved somewhat tapering slightly twisted shortish beak, 

 that fills the anterior fourth of that volution. The mouth, 

 which is of a reversed flask-shape, being oval above, and 

 produced below into a moderately long and very broad 

 canal, occupies half, or rather more than half, of the 

 entire length ; it is destitute of any peculiar sculpture, 

 is of a pinkish flesh-colour, and is more than twice as 

 long as it is broad. The more or less ex])anded outer 

 lip is usually somewhat thickened, but is neither marginatcd 

 nor ribbed behind ; for more than two-thirds of its sweep 

 it is prominently arcuated, and then at the commence- 



