lingulidjE. 585 



recent is quite flexible; the species are chiefly from the 

 coast of South America. 



Sj'ecies of Discing- 



Cumingii, Brod. striata, Sou: 



Evansii, Davidson. strigata, Brod. 



lsevis, Sow. tenuis, Soiv. 

 lamellosa, Brod. 



Fam. TJNGULID^. 



Animal with the oral arms elongated, fleshy, sub-spiral, 

 fringed externally with numerous cirrhi, and situated on 

 each side of the mouth. Mantle with rudimentary branchiee. 



Shell nearly equivalve, hingeless, thin, horny, elongate, 

 supported by a thick peduncle which comes out between the 

 diverging beaks. 



These animals are found perforating the mud of shallow 

 bays, or living in sand or sandy mud in harbours. The 

 shells are covered with a horny epidermis. 



Genus LINGULA, Bruguiere. 



Shell thin, depressed, almost equivalve, hingeless, the 

 valves held together by the adductor muscles, covered with 

 an epidermis, and attached by a peduncle which passes be- 

 tween the beaks ; interior with no calcareous supports or 

 appendages. 



Syn. Pharetra, Bolt., not Hubn. Ligula, Cuv., not 

 Leach or Block. 



Ex. L. anatina, Lamarck, pi. 132, tig. 5. Shell, L. 

 anatina, fig. 5, a. 



