OF CONCHOLOGY. 107 



Triton gemmatus, Rve. 



1844. Conch. Icon, species 60. 



1849. Triton mundum, Gld., Proc. Boston Soc, p. 143. 

 1856. « " " Rep .Am. Ex. Ex., fig. (only) 297. 



Ranella pusilla, Brod. 



1832. Proc. Zool. Soc. London, p. 194. 



1844. Ranella pusilla, Rve. Conch. Icon. sp. 44. 



1845. Triton laciniatum, Migh., Proc. Boston Soc. p. 24. 



Ranella affinis, Brod. 



1832. Proc. Zool. Soc. London, p. 179. 

 1844. Ranella affinis, Rve., Conch. Icon. sp. 19. 

 " " livida, Rve., " " sp. 28. 



I have not been able to separate the above two species by any 

 constant character, after examining a large number from nu- 

 merous localities in Polynesia. 



All their characters, as regards size, sculpture and color, pass 

 from one to the other. The apex of affinis is not always pink, 

 and specimens are met with banded with white, as on the R. 

 granifera. They cannot, however, be confounded with the latter 

 species, which is of lighter growth, granules smaller, and finely 

 striated transversely. The whorls of affinis are not always 

 angulate. On the variety named livida the tubercles are 

 rather more prominent, less in number, and the shell generally 

 smaller. 



Nassa gaudiosa, Hinds. 



1844. Moll. Voy. Sulphur, pi. 9, fig. 16, 17. 



1853, Nassa gaudiosa, Rve., Conch. Icon. sp. 48. 



1852. " lilacina, Gld., Am. Ex. Ex. p. 265, fig. 336. 



The above species varies greatly in shape and color. 



It is often more slender than the type, and occurs of an abbre- 

 viate form, approaching N. picta, Dkr. The color is disposed in 

 blotches or in longitudinal llammules, as well as in transverse 

 bands. It is wholly yellowish or lilac. It is also finely and 

 distantly striate transversely, the striae colored reddish brown. 

 We have received specimens from all parts of Polynesia. 



Nassa lurida, Gld. 



1850. Proc. Boston Soc. p. 153. 



1851. Nassa ? dispar, A. Ad., P. Z. S. London, p. 96. 



1852. Am. Ex. Ex. p. 257, fig. 325. 



1853. Nassa dispar, Rve., Conch. Icon. sp. 45. 



