43 



ANATINA. 



sol en an at in \js f —Linnceus. 

 Chem.6, t. 6,/ 46, 48. 



The Anatinae are very distinct from the Myae, or the 

 Solenes, with both of which they have been blended 

 by former writers. Shell thin, extremely fragile, semi- 

 transparent, subequi valve, gaping at one or both sides, 

 much inflated at one end, resembling a duck's bill; a 

 spoon-shaped tooth on each valve projecting internally, 

 beneath which is placed a curved rib running towards 

 the interior of the shell ; sometimes a closed fissure or 

 suture extends from the apex, giving the appearance 

 of a second rib. These shells appear to connect the 

 Myae and Mactrae, and form a transition to the G. 

 Lutraria. 



Anatina laterna 



truncata 



subrostrata 



longirostris 



globulosa 



Anatina trapezoides 



rugosa 



imperfecta 



myalis 



rupicola. 



