PLANAXIS 



brown horny epidermis; and sometimes the grooves do 

 not extend far behind the outer lip^ so that the back and 

 smaller volutions have the appearance of being worn ; and 

 we cannot positively decide whether they are worn, or 

 whether there never have been any striae on those parts. 



Three species are figured in our plate : 



Fig. 1. Planaxis sulcatus, Lam. Buccinum sulcatum, Born. 



2. mollis, testa elongato-conica, Isevi ; anfractibus planulatis. 



Obs,^ — ^We have reason to believe this to be an English 

 species, because it has been engraved for " Leach's Bri- 

 tish Shells/' but we do not know its locality; it is the 

 only species of which we have seen the operc\ilum or the 

 epidermis. 



3. Plana.vU semisulcatus, testa oblonga, subventricosa, sulcis plurimis 

 transversis, dorso obsoletis ; labio externo crenulato. 



OZ>^.— Since this sheet was sent to press, we have met 

 with several specimens of this shell with their epidermis 

 and operculum, which plainly prove that there never were 

 any striae on the back: the operculum is corneous. 



We have never seen any fossil species of this Geaus.^ 



