1 



794 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxih.' 



DIPLODONTA PORTEZIANA d'Orbigny, 1846. 



Rio de Janeiro, Brazil, and adjacent region. This is probably the 

 same as Lucina leucophceata Reeve, 1850. 



DIPLODONTA PATAGONICA d'Orbigny, 1842. 



Near Rio de Janeiro, Brazil, in 59 fathoms, south to San Bias Bay. 



DIPLODONTA ( FELANIELLA) CANDEANA d'Orbigny, 1846. 



Belize to Brazil, in 2 to 25 fathoms. 



DIPLODONTA (FELANIELLA) VILARDIBOANA d'Orbigny, 1846. 

 Coast of Argentina, in 11 fathoms. 



DIPLODONTA ( PHLYCTIDERMA ) SOROR C. B. Adams, 1852. 



Texas coast to Jamaica. Pleistocene in South Carolina. 

 D. kiawahensis Holmes, 1858, is s^'nonymous. 



DIPLODONTA (PHLYCTIDERMA) NOTATA Dall and Simpson, 1901. 



Marco, Florida, to Porto Rico. 



Like TJ. candeana^ but profusely' punctate. 



DIPLODONTA (PHLYCTIDERMA) SEMIASPERA Philippi, 1836. 



Cape Hatteras, North Carolina, to Cape San Roque, Brazil, in 11 to 

 20 fathoms. 



Luelna granulosa C. B. Adams, 1845, and Dunker, 1853; L. soiri- 

 reticulata (part) d'Orbigny, 1846, are synonymous. 



DIPLODONTA (PHLYCTIDERMA) SEMIRETICULATA d'Orbigny, 1846. 



San Sebastian, Brazil, and southward to the coast of Uruguay and 

 Argentina in 11 fathoms. 



D. semireflecta Krebs, 1864 {lapsus) and D. platensls Dall, 1899, are 

 synonymous. D'Orbigny confused this and the last species under one 

 name, though noting the difterences (in 1853) between the Argentine 

 and Antillean forms; but the ligure given in the original publication 

 is of the Argentine type, and I have therefore restored his name. 

 The Antillean shell is more glo}>ular, smaller, and usually with the 

 sculpture in separate granules or pustules, while that of the Argentine 

 form is more like the reticulations of a stretched net. 



DIPLODONTA (PHLYCTIDERMA) PUNCTURELLA Dall, 1899. 



Jamaica, Porto Rico, St. Thomas, and receding to the Oligocene. 



T 



