64 Marine Shells of the Western Coast of Florida 



long slender foot well adapted for digging in sand and for moving 

 from place to place. 



Shells of the Lucinidae are round or lentiform, compressed, equi- 

 valve and subequilateral. The umbos are small but definite and point 

 forward; the lunule is small and clear-cut. The ligament is internal 

 or semi-internal; hinge teeth are variable and the shell of some 

 genera is edentulous. The interior of each valve shows two muscular 

 impressions and a pallial line. 



Genus LUCINA Bruguiere, 1797 



Subgenus PSEUDOMILTHA P. Fischer, 1887 



Lucina floridana Conrad PI. 11, fig. 66 



Alt., 36; length, 34 mm. Shell white, porcelanous, with thin, 

 brownish, papery periostracum; orbicular, compressed, equivalve, 

 subequilateral; umbos small, pointed; lunule oval; sculpture of in- 

 equidistant concentric growth lines; hinge margin thick, edentulous; 

 interior white; muscle scars and pallial line typical; wide, finely 

 crenate border. 



Common in shallow water. 



Subgenus LUCINISCA Dall, 1901 

 Lucina iiassula*'^ Conrad PI. 11, fig. 65 



Alt., 9.5; length, 10 mm. Shell small, white, rounded, almost 

 equilateral; umbos small; lunule impressed; elegant reticulate sculp- 

 tures of radiating ribs and about 20 concentric, lamellate ridges; 

 cardinal and lateral teeth present; interior white, margins finely 

 serrate. 



Common in shallow water. 



Genus LINGA de Gregorio, 1885 



Subgenus PAIIVILUCINA Dall, 1901 



Linga^^ multiliiieatu (Tuomey and Holmes) PI. 40, fig. 291 



Alt. 5.5; length, 5 mm. Shell small, round, solid, white, valves 

 thick, thin epidermis; about 12 broad radiating ribs crossed by 

 promment concentric ridges; lunule impressed, not ribbed; umbos 

 small; small cardinal and lateral teeth in right and left valves; inner 

 margin finely crenate. 



^•' Lat., nassa, a basket for catching fish. 



^^ Lat., multus, mr.ny ; lineare, to reduce to a straight line. 



