84 Geological Survey of Alabama. 



smooth on the umbonial part, covered with rounded concentric ribs on 

 the ventral part. 



Locality. Jackson, Miss., rare. 



VENERICARDIA INFLATIOR, Meyer. PI. 1, fig. 26. Am. Jour. Set., 

 XXIX., 1885, p. 460. 



Small ; cordate ; ventricose ; subsequilateral ; margin subcircular ; beak 

 elevated and large, turned anteriorly ; surface covered with about twenty 

 ribs ; they are smooth at the umbo, slightly crenulated toward the ven- 

 tral margin ; the interstices are about of the same size as the ribs ; margin 

 crenulated. 



Locality. Claiborne, Ala. 



Differs from Venericardia parva, Lea., from the same locality, princi- 

 pally in being smaller, more ventricose and rounded, and having a much 

 larger beak. 



VENUS RETISCULPTA, n. sp. PI. 1, figs. 27, 27a. 



Rhombically circular ; convex ; covered wrth broad, flat, and somewhat 

 irregular concentric lines, crossed by similar radiating ones ; the sculpture 

 indistinct near the umbo ; an impressed line separates a long limule ; pal- 

 lial sinus large ; margin entire. 



Locality. Claiborne, Ala. 



The sculpture makes the surface appear as if reticulated with small 

 rounded holes, especially in worn shells ; the figured specimen shows the 

 complete hinge, otherwise it is not the largest or best sculptured one. 



ALVEINUS MINUTUS, Conrad. PL 1, fig. 19. 



Alveinus parva, Con., Am. Jour. Conch., 1865, p. 10. List name. 

 Alveinus minuta, Con., Am. Jour. Conch., 1865, p. 138. PL 10, fig. 2. 

 Alveinus parvus, Con., Check List of Tertiary invertebr., 1866, p. 24. 

 Alveinus minutus, Con., Proc. Acad. Nat. Sci., Phila., 1872, p. 53. 

 PL 1, fig. 6. 



Alveinus minutus, Con., Am. Jour. Sci., XXIX., 1885, p. 467. 



Small, nearly circular ; inequilateral ; surface with concentric lines of 

 growth, otherwise smooth and somewhat shining ; beaks small, turned 

 anteriorly ; hinge divided by a minute trigonal pit ; right valve with a 

 pyramidal tooth on the anterior side ; left valve with two compressed 

 ones ; muscular impressions subqtiadrangular, of about equal size ; mar- 

 gin microscopically channeled within ; pallial line simple. 



