20 AMERICAN JOURNAL 



NOTES ON THE SYNONYMY AND DISTRIBUTION OF 

 MARINE GASTEROPODA. 



BY W. HARPER PEASE. 



The localities and distributions of the tropical forms of Mol- 

 lusca, are being now accurately determined by the researches of 

 collectors permanently located at several points in the tropics, 

 and the errors- of transient collectors, on whom we have hereto- 

 fore mostly depended, are being corrected and consequently the 

 synonymy of the species. 



As the local catalogues published by such gentlemen are de- 

 serving of the highest credit, it is the more necessary that any 

 errors they may have fallen into as to the identity of species 

 should be corrected. 



The following synonyms of the species inhabiting the Island 

 of Bourbon, have been determined from specimens named by M. 

 Deshayes for the gentlemen from whom I received them. 



They have, in addition, been carefully compared with the 

 published descriptions and figures. 



RlSSOINA ANGASII, Pse. 



Rissoina turricula (Ang. non Pse.) Proc. Zool. Soc, 1867, p. 

 114. 



Name preoccupied for a species inhabiting Polynesia, de- 

 scribed in Proc. Zool. Soc. 1860, p. 488. 



Terebra contigua, Pse. 



Terebra assimilis (Pse. non Ang.) Am. Jour. Conch., 1869. 



Name preoccupied by Mr. Angas for an Australian species, 

 described in Proc. Zool. Soc. 1867. 



Tritonidea assimilis, Rve. 



Buccinum assimile, Rve., Con. Icon., Sp. 90. 



The above species is credited to Australia by Mr. Angas in 

 his catalogue, Proc. Zool. Soc, 1867, p. 187. 



It is closely related to D' Orbygnii, Payr, inhabiting the Medi- 



