796 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



DIPLODONTA (FELANIELLA) OBLIQUA Philippi, 1846. 



Cape St. Luc'tts to Cxuayaquil. 



This is Diplodonta ohliqua Philippi, 1846, but not Lucina obliqua 

 Philippi, 1850 (April), nor of Reeve (June), 1850, Defranee, 1823. nor 

 Goldfuss, 18-11. Luc'ina ealcnlus Reeve, 1850, is synonymous. 



DIPLODONTA INCONSPICUA Philippi, 1842. 



Island of Chiloe, on the southern coast of Chile. 



This is D. inco7ispicua Philippi^ and Huppe." It is a rude species, 

 with a coarse periostracum, the aiialogue in the Southern Hemisphere 

 of 1). T(n'cin var. aJeuficil Dall in the northern Pacific. 



DIPLODONTA (FELANIELLA) SERICATA Reeve, 1850 



Lower California to Panama. 



This species varies slightly in outline and convexity, according- to its 

 state of growth, and has been described inthelconica under the names 

 of Lucina cornea, L. niteuH^ and L. serlcata Reeve. Carpenter called 

 it Felaniaserricata {sic), by which name it is best known. He labeled 

 some rather convex specimens in the U. S. National Museum Z. teUl- 

 noldes Reeve, but from the best information I can obtain the true 

 L. teUinoides is a Pseddomiltha, as elsewhere indicated. 



DIPLODONTA (PHLYCTIDERMA) C^ELATA Reeve, 1850. 



Bay of Guayaquil, Cuming. 



This species belongs to the same group as D. sevnirugom Dall, but 

 diti'ers by its almost internal ligament, larger size, and coarser sculpture. 



DIPLODONTA (PHLYCTIDERMA) SEMIRUGOSA Dall, 1899. 



Gidf of California to Panama, 



This is DqtJodonta ,'<c//u'asjje/'a of Carpenter, 1S57, but not of Philippi, 

 1836, which is the West Indian form. The Japanese species which has 

 been called bv the same name is now known as D.jaj?onica Pilsljry. 



NOTES. 



Lucina {Diplodonta?) capax Carpenter, 1863, page 69, from Pan- 

 ama, appears to be a nomen nudum . Lucina obliqua Philippi, 1850, 

 is an uncertain species, both as to habitat and characters. It is not the 

 Diplodonta ohllqua Philippi, 1816. The Lucina punctata mentioned 

 by Carpenter and others as inhabiting Panama is not the Diplodonta 

 punctata Say or the Codakia punctata Linnaeus. It was probably 

 intended for the latter, which is not found on the west American coast, 



' Wiegmann's Archiv., 1842, p. 74. 



'Gay's Chile, VIII, 1854, p. 357, atlas, pi. viii, tig. 4. 



f 



