6 APLUSTRID.E. 



columella, and in Itieria, another extinct form, the outer 

 lip is internally plicate. 



Species of Buccinulus. 



aflinis, A. Adams. punctatus, Mart. 



coccinatus, Reeve. pusillus, A. Adams. 



glaber, Reeve. solidulus, Linn. 



iusculptus, Reeve. suturalis, A. Adams. 



nitidulus, Lam. tessellatus, Reeve. 



Fam. APLUSTRIDyE. 



Teeth, central none; lateral numerous, uniform. Head 

 with the frontal disk produced into large ear-like, tenta- 

 cular lobes folded over the back of the shell, and fur- 

 nished with bifid labial appendages ; eyes sessile at the 

 inner bases of the tentacular lobes. Mantle with the 

 inner margin thin and membranous, the outer forming a 

 thick, fleshy lobe, curving round the spire of the shell ; 

 branchial plume long and single. Foot large and mem- 

 branous, auriculate in front, rounded behind. 



Operculum none. 



Shell external, involute, ornamented with coloured 

 bands or markings ; aperture more or less channelled at 

 the fore part. 



Genus APLUSTRUM, Schumacher. 



Shell globosely ovate, axis imperforate, solid, smooth, 

 banded, covered with a thin epidermis ; spire obtuse ; 

 aperture oblong, with a short, wide canal at the fore part; 

 inner lip thin, membranous, adnate posteriorly to the 

 body-whorl, free and forming a spiral lamina anteriorly ; 



