and highly polished ; terminating above in obtuse points on the 

 second spiral whorl, leaving a narrow ascending channel be- 

 tween ; the inside of the aperture is a fine yellow. 



Inhabits the Indian seas, but is not common. 



By some unaccountable oversight, Mr. Dillvvyn has very well 

 described this shell, but under the name and supposition of its 

 being the S. marginatus of Linnasus ; though a tew pages after 

 he brings all the true synonyms referring to his shell, under a 

 description purporting to be that of S. mimmtis, but \vhich in 

 reaUty is more applicable to our next species. Why this writer 

 should doubt the coriectnessof Gmelin, Chemnitz, &c. respecting 

 the true S. marginalus of Linnffius, does not appear, particularly 

 as he has substituted for it a well known species. 1 have little 

 doubt myself they all mean one and the same shell, which is 

 nothing more than a scarce variety of S. accbictus, now before 

 me, with which Linnseus's original description pretty well agrees. 



S T H O M BUS variabilis. 

 Variable Strornbus — upper Jigure. 



S. testa nodose plkata, spira striis nullis ; lahio interiore sinipUcc, exterimv re- 

 Jlccto, intra lavi, supi'u leviter lubato. 



Shell with nodulous plaits, the spire not striated. Inner lip simple. Outer 

 lip reflected, smooth within, and slightly lobed above. 



Shell two inches and a quarter long, the spire occupying little 

 more than half an inch. The ground colour generally is white 

 with numerous undulated short lines of a darker colour, some- 

 times crossed by four or five obsolete whitish bands : it ap- 

 proaches very near /S. rniiiimus, but is easily distinguished by 

 being in general much larger, by having the inner lip not at all 

 thickened above, the outer lip very slightly lobed, and only ad- 

 vancing on the first volution of the spire : it varies, however, 

 amazingly in colour. There is a small variety, having a brown 

 spot beneath, from India ; and others (labelled from the So. Seas) 

 in the Banksian collection, also small, are purplish-brown, with 

 three or four well-defined bands of white : the aperture is always 

 pure white. 



