l66 DISCOVERY REPORTS 



I am also grateful to Dr V. Fretter for a great deal of helpful discussion on reproduction in the 

 Gastropoda, and to Dr H. E. Bargmann and Mr T. J. Evans for their careful and kindly criticism of 

 the manuscript. The greater part of this paper was completed while I was the holder of the University 

 of London Table at the Plymouth Laboratory of the Marine Biological Association, and I have to 

 acknowledge the kindness throughout of Mr F. S. Russell, F.R.S., and others of the laboratory 

 scientific staff. 



Table i . Positions and hydrological data of stations yielding Mollusca* 



* See Discovery Reports, supr. cit. 



I. SYSTEMATIC 



Class GASTROPODA 



Subclass Prosobranchia 



Order MESOGASTROPODA 



Superfamily Ptenoglossa 



Family Ianthinidae 



Ianthina ianthina (Linnaeus) 



1767 Helix ianthina Linn., Syst. Nat. ed. 12, 1246. 



1798 Ianthina violacea Bolten, Mus. Bolt. 75. 



1815 Ianthina fragilis Lmk., Anim. sans Vertebr. (earlier ed.). 



1835 Ianthina communis Lmk., Anim. sans Vertebr. (ed. Desch.), 9, 4. 



1850 Ianthina planispirata A. Ad. & Rve., Zool. Voy. H.M.S. 'Samarang', p. 54, pi. xi, fig. 10. 



1853 Ianthina britannica Leach in MS., Forbes and Hanley, iv, 260, pi. 133, fig. 1. 



1858 Ianthina balteata Rve., Conch. Icon, xi, pi. 3, fig. 11. 



1858 Ianthina depressa Rve., Conch. Icon, xi, pi. 3, fig. 14a, b. 



1858 Ianthina trochoidea Rve., Conch. Icon, xi, pi. 2, fig. 10a, b. 



1858 Ianthina roseola Rve., Conch. Icon, xi, pi. 1, fig. ia, b. 



1858 Ianthina africana Rve., Conch. Icon. XI, pi. 2, fig. 8, 8a. 



