SOLECTJETID^. 51 



is closed only in the middle. Through the front open- 

 ing protrudes a very thick and large pointed foot ; and 

 through the hinder gap are jutted out the thick^ uneven, 

 unequal, divided siphons with fringed openings. The 

 British species are — 



S. coarctatus: animal white; shell covered with a dark 

 green epidermis, and slightly strictured in the middle. 



8. candidus : shell similar in shape, but marked with ob- 

 lique striae. Animal of bright orange-colour, and very 

 large, compared with the shell. 



