108 AMERICAN JOURNAL 



1854. Nassa graphitera, Beck., Voy. au Pol. Sud. p. 80, pi. 21, 

 fig. 28, 29. 

 We mark the last synonym as doubtful. The description 

 corresponds precisely with the type, and with specimens from 

 North Australia and Samoas. 



Nassa albescens, Dkr. 



1849. Buccinum albescens, Dkr., Abbild. und Besch., p. 68, pi. 



2, fig. 15. 

 1854. Nassa bicolor, Horn, and Jacq., Voy. au Pol. Sud., p. 84, 



pi. 21, fig. 41, 42. 

 Dr. Dunker informs me that the locality given for this species, 

 " West Indies," was probably incorrect, having received it 

 from the East Indies. It was collected by Rom. and Jacq., 

 at the Tongas, and my specimens are from the Caroline Islands. 

 Acinosa, Gld., Am. Ex. Ex., may also prove to be synonymous. 

 It appears to be also closely related to N. Isabella, D'Orb., 

 which though described as from Central America, we have re- 

 ceived from the Red Sea. It was connected with marginulata 

 by Mr. Reeve, from which M. Deshayes separates it, in his 

 work on Bourbon shells, under the name of Kieneri. 



The Polynesian species may prove to be a variety of that in- 

 habiting Bourbon and the Red Sea. 



Nassa obliqua, Horn, and Jacq. 



1854. Voy. au Pol. Sud., vol. 5, p. 84, pi. 21, fig. 43, 44. 

 1863. Nassa onerata, Desh., Conch, de Bourbon, p. 130, pi. 12, 



fig. 24, 25. 

 1868. Nassa obliqua, Pse., Am. Jour, of Conch. 



The above is of a peculiar form, quite distinct from any de- 

 scribed heretofore. The description by M. Deshayes corres- 

 ponds to the figure in Voy. au Pol. Sud., more nearly than the 

 original description. The specimen in my collection is from 

 Western Polynesia, and is an exact copy of the figure of onerata. 



The species appears to be very rare, as but one specimen only 

 has been collected at each of the localities where it has been 

 found. 



Nassa costellifera, A. Ad. 



1851. Proc Zool. Soc. London, p. 112. 



1853. JSassa costellifera, Rve., Conch. Icon., sp. 58. 



1854. " Quoyii, Horn, and Jacq., Voy. au Pol. Sud., p. 79, 

 pi. 21, fig. 20—22. 



The above ranges throughout Southern and Western Polynesia. 

 It approaches, in some of its varieties, N. margaritifera, Dkr. 



