150 ANIMALS OF THE SEASHORE 



Modiolus modiolus Linne (Bearded Mussel) 



PLATE XIX. Fig. 11 



In this genus the beak is not ai the tip of the 

 shell but a little to one side. The shell is large (up 

 to 5 inches) and is covered with a dark brown epider- 

 mis and a tough growth of hair. Common from New 

 England to the Arctic; known from deep water off 

 Long Island, New Jersey and North Carolina; a few 

 shells have been found on the beach at Point 

 Pleasant, N. J., Wildwood, N. J., and Cape May, N. J. 



Modiolus demissus Dillwyn (Horse Mussel) 



(M. pUcatula Lamarck) 



PLATE XIX. Fig. 10 



Beak similar to the above but the shell has 

 numerous radiating ribs; the epidermis is very thin 

 and of pale brown color; length up to 4 inches. Very 

 common in New Jersey on tidal mud flats and estu- 

 aries, extending into brackish and almost fresh 

 water; found between the tides and above high water 

 mark. Known from the Gulf of St. Lawrence to 

 Florida; not edible, frequently poisonous. 



Pandora gouldiana Dall (Pandora) 



(P. trilineata Gould; P. trilineata Say (?) ) 



PLATE XIV. Fig. 13 



An extremely flat white shell about 1 inch long. 

 The shell is shiny, rounded anteriorly and extended 



