DESCRIPTION. 185 



separated above^ expanded^ thickened ; aperture 

 toothed. 



Nondescript, 



Specimen dark brown with a reddisn tinge^ aper- 

 ture white ; upper part of the columella and mar- 

 gin of the outer hp brown. 



Shell smooth, plaits broad, folded towards the 

 aperture ; upper margin of the whorls surrounded 

 with a tumid belt ; lower part of the body trans- 

 versely sulcated • columella 4-toothed, outer lip 

 with nine teeth ; apex pale, diaphanous. 



Habitat unknown. 



For permission to make a drawing of this and of 

 fig. 4, the author begs to acknowledge his obliga- 

 tion to Lady Wilson of Charlton House. 



Fig. 4. Chiton spinosus. 



Shell 8-valved, semi-granulate; margin spinous. 



Nondescript. 



Specimen fuscous, nearly black -, keel of the six 

 middle valves marked with a cordate red spot ; 

 marginal niembrane brown and broad ; spines 

 black, long, solid, subulate and rather bent j late- 

 ral triangles on the valves granulate, remaining 

 areas transversely striate ; posterior valve entirely 

 covered with raised dots, internal surface whitish. 



