GARRETT: ON POLYNESIAN MITRID^. 



with convex ridges. They also inhabit different stations and 

 belong to different subgenera. 

 Mitra anthraclna Reeve, Conch, Icon., pi. xviii., fig. 137. 



This is also a very rare species of which I found two 

 examples under stones, in the middle region of the litteral 

 zone, at Taviuni, Viti Islands. 



Our shells are a little smaller and the spire is more robust 

 than represented in Reeve's figure. 

 Mitra alba Pease, Thala alba, Pease, Amer, Jour. Conch., 

 1867, p. 215, pi. XV., fig. 8. 



A few examples of this small rare species were found in 

 beach sand at the Pa^motu and Society Islands. 



Its small sixe, (8 mill.) uniform glossy white color and 

 fine spiral impressed stricE will readily distinguish it. 



Mr. Pease referred it to the genus Thala. ' It should I 

 think be embraced in the subgenus Mutyca. 

 . Mitra assimilis Pease, 1. c, 1867, p. 211, pi. xv., fig. i. 



Three dead specimens found beneath stones in the 

 lower region of the litteral zone at the Marquesas group. 



They agree in every particular with Mr. Pease's descrip- 

 tion and figure, except in being a little smaller and the pale 

 subsutural band not so distinctly defined. 

 . Mitra abbatis Chemnitz. Reeve, Conch. Icon., pi. xiii. 

 fig. 91. 



This, which is one of our rarest South Sea Mitres, has 

 occurred to us only in the condition of beach shells, at 

 Huahine, Society Islands. 



Reeve's figure which represents a Philippine example, 

 though one third larger than Polynesian, agrees in every other 

 particular with our shells. 



!. Mitra brumalis Reeve, 1. c, pi. xxxiv., fig. 280. 



Occurs beneath dead coral on reefs, and, excepting the 



