^ 



GARRETT: ON POLYNESIAN MITRID^. II 



genus, I think its position should be in the subgenus 

 Nebida^ia. 



6. Mitra ancillides Swainson. Reeve, I.e., pi. xxxviii., fig. 319. 



An exceedingly rare species of which I found two dead 

 but perfect examples washed up on the outer beach at Anaa, 



one of the Pa^^motu Islands. 



Mr. Swainson's type specimens were collected by Cuming 

 in the same locality. My largest example is 20 mill, in 

 length, and both are creamy-white with a very faint luteous 

 tinge. The upper whorls are granulated and the columella 

 six-plaited. 

 Mitra aurora Dohrn. Proc. Zool. Soc. 1861, p. 205, 

 pi. xxvi., fig. 3. 



This rare and beautiful species occurred to our notice at 

 the Sandwich, Society, Cook's and Paijmotu Islands, where 

 they were all found washed up from deep water on the outer 

 reefs. All my examples are in the condition of more or less 

 perfect dead shells. 



The colour, which varies from light orange to orange-red, 

 is undoubtedly darker in the living shells, and is more or less 

 frecked and striped with white. 



The late Mr. Pease considered it a large variety of Jf/Zra 

 coronata. It appears to me, however, sufficiently distinct to 

 rank as a separate species. 



My largest examples which were found at Anaa, Pa>5motu uul 

 Islands, are 45 mill, in length, which is nearly twice the size 

 of Polynesian specimens of coronata. As compared with the 

 latter, the whorls are not spirally ridged, the incised lines are 

 finer, the punctures smaller, more crowded, and the colu- 

 mella has one more plait. 



Polynesian examples of coronata are dark brown with a 

 tawny-yellow subsutural band, and the whorls are encircled 



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