GARRETT: ON POLYNESIAN MITRID^. 69 



nearly the same color), and more distantly allied in shape to 

 Stroinbus terebellatiis, has induced our most eminent autho- 

 rities on classification to assign it a position intermediate 

 between the above two genera. 



It is surprising when Mr. Pease published his genus 

 MUroidea, he should have failed to allude to its very near 

 relationship to Dibophiis. The only difference between the 

 two genera consists in the former having several small 

 columellar plaits, whilst in the latter the anterior half of the 

 columella is simply roughened by a continuation of the small 

 elevated transverse ridges which mark the external surface 

 of the shell. ^ 



That portion of the pillar-lip immediately above the 

 prolonged ridges, is, as in all Miindce, perfectly smooth, so 

 that they may be considered rudimentary plaits. In every 

 other particular, as regards detail of structure, the two genera 

 are precisely alike, with the exception of Mitroidea having a 

 more produced spire and a smooth shell. 



The animal as stated in my paper on Mitridce., published 

 in the Pro. Zool. Society for 1872, has the external structure 

 of a Cylindra^ which is widely different from that of a Conns 

 or Strombus. 

 167. Dibaphus Philippii Crosse. 



Conohelix edentula^ Swain son, MS. 



Conus edentuh/s, Reeve. Conch. Icon., Mitra, pi. xi., 

 fig. 80. 



Dibaphus edejitulus, Philippi, Arch. Weig., 1847,- P- 61, 

 pi. iii., fig. I — 3. — Chenu, Man. Conch., vol. i, fig. 1569. — 

 Garr. P. Z. S., 1872, p. 843. 



Dibaphus Philippii, Crosse, Rev.' Zool., 1858, p. 4, pi. 

 iii., fig. I. — Pease, Jour. Conch., 1871, p. 98. 



This singular shell, which appears to be rare, was ob- 

 tained at all the groups south of the Equator, except the 



