GARRETT: ON POLYNESIAN MITRID^. 65 



Genus CYLINDRA Schim. 



157, Cylindra nucea Gronovius. Reeve, Conch. Icon., pi. 

 xii., fig. 86. 



Excepting the Marquesas, we obtained this somewhat 

 rare species at all the South Sea groups. The habitat " New 

 Zealand" usually assigned to this species is undoubtedly 

 wrong. 



Our examples, which are smaller than Reeve's figure, 

 are white, with or without transverse rows of small brownish 

 dots, and when in good condition are invested with a very 

 thin translucent tawny-yellow epidermis, which is more or less 

 stained with brown-black. 



The animal is diluted white ; the foot and siphon mar- 

 gined with dashes of black and white. 



158. Cylindra dactyl us Linnaeus. Reeve, 1. c, pi. xii., fig. 88. 



Occurs in the same station as the preceding species — 

 that is, in sand or sandy-mud inside the reefs. They were 

 obtained at all the groups except at Cook's Island. It appears 

 to be scarce everywhere. 



Our largest examples, which were found at the Viti 

 Islands, are larger than Mr. Reeve's excellent figure of a 

 Philippine specimen. 

 159- Cylindra crenulata Lamarck. Reeve, 1. c, pi. xxiv., 

 fig. 190a. 



Found in the same station, and is as widely diffused as 

 the preceding species. It is rather a scarce shell at all the 

 groups. 



Our largest Viti example, which is nearly two inches 

 long, is considerably larger than Reeve's figure. 

 160. Cylindra fenestrata Lamarck. Reeve, 1. c, pi. xxiv., 

 fig. 189. 



