386 Notes on Shells. 



base in any variety of Arabica, nor, so far as I can find, is it 

 ever found in that species. Indeed the two shells are totally 

 unlike, and the C. Maculata is as distinct as any other species 

 whatever. It is never reticulated ; but in its adult state the 

 back is gibbous, and the shell triangular, like C. Mauritiana, 

 or C. Caput serpentis. In this state the brown in part covers 

 the white spots, producing a mottled appearance like the C. 

 Mauritiana. In very old specimens, the enamel from the base 

 extends more than halt-way up the sides, and covers two-thirds 

 of the back. It more resembles C. Mauritiana than any other 

 species, but differs from this in having the base and sides 

 somewhat flesh-colored, with numerous black or dark brown 

 spots. It cannot be confounded with any other species by 

 those who have once examined it, and observed it in the 

 various stages of its growth. 



The small shells figured on plate ix. were described, but 

 the description withheld, for want of a reference to some of 

 the latter plates of the Encyc. Meth., to which Lamarck 

 makes constant reference, but which, on examination, were 

 not found in any of our copies. 



