PLEIOCBNE FOSSILS 93 



SINODESMIA.— Reclus. 



The genus Sinodesmia commenced its existence in 'the Meiocene seas. 

 SINODESMIA OAEINATA— d'Orb. 

 Plate XXIII. Fig. 2. 



Amphidesma carinata, Con., Foss. Ter. For., p. 37, pi. 19, fig. 7. 



Amphidesma carinata, Con., Jour. Acad. Nat. Sci., Vol. 6, p. 229, pi. 9, fig. 23. 



Sinodesmia carinata, d'Orb., Prod, de Paleontologie, Vol. 3, p. 101, No. 1890. 



S. testa ovali compressa, striis tenuissimis confertis, et sulcis profundioribus remotisque 

 impressa; umbonibus post medium positis; margine obtuse undulata. 



Description. Shell ovate-oval, compressed, with regular concentric strise fine and 

 crowded and others more profound and remote; beaks rather posterior to the middle, 

 slightly prominent; submargin with an obtuse undulation. 



Plate XXIII. Fig. 2, Natural size. 



Locality. Waccamaw. Museum, College of Charleston. 



AMPHIDESMA.— Lam. 



The genus Amphidesma commenced its existence in the seas of the Meiocene period. 



A MP HIDES MA EQUALIS. — Co rf. 



Plate XXIII. Fig. 3. 



Amphidesma" v equalis, Con., Jour. Acad. Nat. Sci., Vol. 2, p. 30$. 9, / ! 

 Amphidesma equalis, Con., Foss. Ter. For., p. 76, pi. 43,fig. 9. 

 Amphidesma equalis, Say, Amu. Conch., p. 28. 

 Amphidesma equalis, d'Orb., Prod, de Paleontologie, Vol. 3, p. 101, No. 1886. 



A. testa sub-orbiculari, ventricosa, Icevi; umbonibus extremitatem analem propioribus; 

 declivitate umbonali, submarginali, subcarinata; latere anali leviter inflexo. 



