86 PEECY SLADEN TEUST EXPEDITION. 



most difficult genus, worked out mainly with the aid of the extensive series contained in 

 our National Collection, many changes are proposed. May we hope that this invaluable 

 paper is only the prelude to an illustrated monograph ! 



Family Hippoiiycidae. 



63. Miti'ularia eqvestris (L.). 

 Loc. Amirantes : S. Joseph I. 



64. Mitrularia cicatricosa (Reeve). 

 Loc. Seychelles : Praslin I. 



M. tortilis, Reeve, seems synonymic. Tryon has united every form under the typical 

 name equesfris, L., but we think he has gone too far in his amalgamation, though, 

 doubtless, far too many speciiic forms have been described. 



65. Amalthea australis (Quoy). 

 Loc. Coetivy I., on Phasianella. 



Seychelles : Praslin I., upon Turbo argyrostomus, L. 



Chagos Archipelago : a distorted form, with shelly base, shell assimilating upper 



valve of a Chama. 

 Chagos Archipelago, Egmont I. : a smoothish variety, red-blotched. 



Family SolariidaB. 



66. Solarium maximum, Phil. 



Loc. Saya de Malha Banks : Station 12, 47 fathoms, shell-rubble and mud. 

 Only in young condition ; but without much doubt referable to this species, whicb, 

 when well grown, attains a diametrical measurement of 2| inches. 



67. Solarium modestum, Phil. 



Loc. Seychelles : Station P 2, 31 fathoms, coi'al, sand, ai,nA. Lithothamiiia-rub\i[s. 



68. Solarium perspectivum (L.). 



Loc. Amirantes : Station E 9, 34 fathoms, Polyzoa and shell-rubble. 



69. Solarium {Fhili2^pia) oxytropis, A. Ad. 

 Loc. Amirantes : S. Joseph I. 



The specimen (one only) is imperfect, but agrees with New Caledonian examples, so 

 far as comparison can be made. 



70. Torinia dorsuosa (Hinds). 



Loc. Amirantes : Station E 6, 28 fathoms, Pecten-Yalve rubble. 



