116 



TRANSACTIONS 1.1 VERPOOL BIOLOGICAL SOCIETY. 



feelers and a wonderful row of gleaming eyes. No 2 is 

 also a bivalve (Mactra truncata), but is one which burrows 

 in sand by means of the long blade-like " foot " seen to 

 the right of the figure (the animal's anterior end), while 

 at the opposite (posterior) end is seen a double barrelled 

 tubular arrangement by means of which supplies of water 

 are drawn into the body and ejected. The razor-fish 



Fig. XXI., Mollusca (a little reduced). 



(Solen sUifjua) is another bivalve which is abundant in the 

 sand exposed at low water of spring tides in Port Erin 

 Ofay. It lives in a burrow which traverses the sand in a 

 slightly oblique direction to a depth of two feet or more, 

 and its rapid movements up and down this are effected by 

 the powerfully muscular foot, a long cylindrical organ 



