SHELLS. 445 



PLATE XL. Figs. 5, 6. 



MELANIA GYLINDEOIDES, Baird. 



Shell rather small, of an olive colour, smooth, finely longitudi- 

 nally striated ; apex corroded, remaining whorls only 3 in number, 

 very ventricose and rounded, last whorl longer than the two pre- 

 ceding ; mouth oval, inside of a bluish colour ; columella pecu- 

 liarly twisted, somewhat callous at upper part. 



Length nearly 9 lines. 



Breadth 4^ lines. 



Hab. Niue or Savasfe Island. 



PLATE XL. Fio. 7. 

 CHITON (ONITHOOHITON) AMIGOBUM, Baird. 



Shell oval, nearly equal at each extremity ; mantle margin 

 covered with numerous chaffy-looking scales ; first valve larger than 

 any of the others, marked with numerous granular lines ; centre 

 valves strongly striated, lateral areas with 2 or 3 granular lines ; 

 last valve small and striated. A line of a red coloiir runs along 

 the top of all the valves, whilst one or two others run along the 

 lateral areas. 



Length 8 lines. 



Breadth 5^ lines. 



Hab. Niue or Savage Island. 



