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TERTIARY FAUNA OF FLORIDA 



Section Eurytellina Fischer, 1887 (Peronaoderma Morch, 1853, non 



Poli, 1795). Type T. punicea Born. 



Valves compressed, flexure obsolete or absent, the surface feebly con- 

 centrically sculptured, a radial rib behind the anterior adductor scars, the 

 left posterior lateral lamina obsolete or absent, the anterior laterals adjacent, 

 the pallial sinus close to or touching the anterior adductor scar and (in the 

 type) wholly coalescent below with the pallial line. Tropical and warm 

 temperate seas. 



Section Scrobiculina Dall, 1900. Type Scrobicularia viridotincta Car- 

 penter. 



Valves thin, flexuous behind, feebly sculptured; hinge with the anterior 

 right lateral subapproximate, the other laterals feebly developed ; resilium 

 short, deep, internal on the excavated hinge-plate; radii feeble or 'absent, the 

 sinus moderate, confluent below. 



Differs from Metis by its regular Tellinoid shape and better developed 

 hinge. 



Section Quadrans Berlin, 1878. Type T. gargadia Linne. 

 Valves as in Eurytellina, but bluntly truncate behind, externally sculp- 

 tured with oblique grooving; sinus as in Eurytellina, hinge with the left 

 laterals both obsolete. Recent warmer seas. 



Section Tellinides Lamarck, 1818. Type T. iimorensis Lamarck. 



Shell compressed, equivalve, with no flexure or sharp truncation, a single 

 approximate anterior lateral, no internal thickened radii, the sinus coalescent 

 below, the external sculpture feeble. 



This group was proposed with generic rank by Lamarck owing to his 

 misinterpreting the adjacent small lateral as a third cardinal tooth. It differs 

 from Quadrans by the absence of the posterior right lateral and of the ex- 

 ternal oblique grooving. Recent warm seas. 



Subgenus Phylloda Schumacher, 1817. Type Tellina foliacea Linne. 



Shell large, compressed, with a very long ligament, the nepionic valves 

 undulate, the adults delicately, chiefly concentrically, sculptured ; posterior 

 dorsal margin convex and more or less dentate ; hinge with the laterals very 

 small or obsolete ; a minute right anterior and usually a feeble left anterior 

 may be traced close to the cardinals ; sinus, more than half free from the 

 pallial line below, linked by a lineal scar to the anterior adductor scar. 

 Tropical. 



