HELICIDJE. 129 



bular, with the mouth a little longer than wide, the 

 edge of which is slightly reflected ; of a dull olive 

 colour, with generally four interrupted brown bands, 

 one and rarely two of them penetrating the mouth. 

 It varies much in colours and markings, but is readily 

 known by its wrinkled coat. 



1. It varies in colour. — Sometimes they are pale yel- 

 lowish, without bands, but generally banded, sometimes 

 the bands are all separate, but generally the second 

 and third bands are united into one ; sometimes all the 

 bands are united together, which makes the shell ap- 

 pear darker, and marked with transverse pale lines. 



2. It varies greatly in size according to the quan- 

 tity of food, and the temperature of the place in 

 which it lives. 



Monstrosities sometimes occur : — 



1. Reversed, or with the whorls turned in a con- 

 trary direction. 



2. With the spire elongated, and conical when 

 the whorls are rounded. 



3. With the whorls produced, and separated from 

 one another * : the latter has been called — 



Cornucopia Born, Mus. 262. 



Serpula Cornucopia Gmelin. 



Serpula helicina Solander. 



Cornucopia helicina Shaw, Nat. Misc. xiv. 568. 



Cornucopia monstrosa Chemn. 



The internal spicula or darts, which this species 

 ejects in the spring of the year, are about a quarter 



* A figure of this monstrosity ornaments the covers of this 

 work. 



G 5 



