120 AMERICAN JOURNAL 



transverse grooves at base render the ribs granulose, as 

 mentioned by Mr. Reeve. The color and size of the ribs vary 

 at different localities. The Paumotus variety described by Mr. 

 Reeve is sometimes wholly dark brown or black, relieved by a 

 few light spots. M. pisolina, Lam., is probably a variety in 

 color only. M. cavea, Rve, should also be compared, though no 

 mention is made in the description of that species of transverse 

 strise. 



Mitra (Thala) todilla, Migh. 



1845. Pleurotoma todilla, Migh., Proc. Bost. Soc. p. 24. 



Mitra pudica, Pse. 



1860. Proc. Zool. Soc. London, p. 146. 



1860. M. nuxavellana, Dohrn., Proc. Zool. Soc. p. 368. 



TURRICULA BELLA, Pse. 



1860. Proc. Zool. Soc. London, p. 145. 



1860. Mitra Wisemani, Dohrn, Proc. Zool. Soc. p. 367. 



The specimen described by M. Dohrn differs from the type 

 in being more abbreviate in form, resembling M. arenosa, Lam. 

 The color of his specimen was faded. 



Mitra astricta, Rve. 



1844. Conch. Icon. sp. 188. 



I860; ? M. Samuelis, Dohrn, Proc. Zool. Soc. p. 368. 



I mark the above synonymy as doubtful. The only authentic 

 specimens I have (received from Mr. Cuming) is much weathered 

 and worn. Of Hawaiian specimens I have a full series. The 

 shell is covered with a persistent greenish epidermis, as repre- 

 sented in the figure in Con. Icon., or sometimes of a brownish 

 color, as described by Mr. Reeve. When worn off, the color of 

 the shell is whitish, striated transversely, striae colored brown, 

 and is seldom minutely striate longitudinally. 



Mitra Collumbell^eformis, Kien. 



Coq. Viv. p. 47, pi. 15, fig. 46. 

 1839. Mitra striata, Gray, Voy. Blossom, p. 135, pi. 36, fig. 7. 

 1844. " columbellceformis, Rve., Conch. Icon. sp. 138. 



The specimen figured in Voy. Blossom appears to be some- 

 what worn. I have received a number from the same locality 

 (Paumotus) and other species is widely distributed over Polyne- 

 sia. The figure in Conch. Icon, is most characteristic of the 

 species, that by M. Kiener approaches the one in Voy. Blossom. 



