mei,o. 273 



9. mucronatus (f. 34) should be Georgin.e, Gray. I give a 

 more mature specimen to complete the representation with f. 23, 

 28. 



10. umbilicatus (f. 33). Mr. Reeve considers this to be V. 

 ducalis of Lamarck, but the description in the Ann. S. Vert, 

 does not identify it. The chief characteristic of V. ducalis is the 

 shortness of the spines and the invariable protuberance of the spire 

 beyond them ; while in M. itmbilicatus the spines are, except in a 

 young state, loug, and the shoulder on which they rest is high 

 above the apex, leaving it in a hole or umbilicus. The reticulated 

 markings are a matter of minor importance. The mature specimen, 

 f. 32, completes the representation with f. 18, 29, 30. 



11. regius (f. 31), Sclireb. el Wagn. — Mr. Reeve has com- 

 pared this with Cymbium JEthiopicum, showing the dilferences. 

 There are specimens of M. diadema figured in the ' Iconica ' 

 which more nearly resemble it. It is, however, a more rounded 

 shell, with a less oblicpae columella. 



