1 1 



Neilonella weberi sp. nov. 

 Neilo7tella delicatula sp. nov. 

 Arca (Barbatia) weberi sp. nov. 

 Arca (Bathyarca) sibogai sp. nov. 

 Lhnopsis dautzenbergi sp. nov. 

 Glycymeris datttzenbergi sp. nov 

 Modiolus (Modiohcs) dubius sp. nov. 

 Solamen sibogœ sp. nov. 

 Pteria triangtilaris sp. nov. 

 Pteria tomlini sp. nov. 

 Pteria sibogœ sp. nov. 

 Spondyhis serraticosta sp. nov. 

 Lima (Lima) tomlini sp. nov. 

 Lima (Limaria) fenestrata sp. nov. 

 Lim,a (Limatula) sibogai sp. nov. 

 Cardita (Venericardia) pelseneeri sp. nov. 

 Glossocardia stoliczkana sp. nov. 

 Vesicomya solidissima sp. nov. 

 Vesicoinya compressa sp. nov. 

 Vesicomya winckworthi sp. nov. 

 Dentilucina (Dentilucina) inanis sp. nov. 

 Dentilucina (Callucina) flabelliformis sp. nov. 

 Dentilucina ( Bellucina) macassari sp. nov. 

 Dentihicina (Bellucina) hedleyi sp. nov. 

 Dentilucina (Bellucina) hedleyi var. quadrata 



nov. 

 Diplodonta lamyi sp. nov. 

 Diplodonta dtibia sp. nov. 

 Montacuta smithi sp. nov. 

 Montacuta pelseneeri sp. nov. 

 Montacuta (Mysella) sibogai sp. nov. 

 Isoconcha sibogai gen. et sp. nov. 

 Tellina (Tellina) patagiata sp. nov. 

 Tellina (Peronidia) jnacassariensis sp. nov. 



Abra sibogai sp. nov. 



Abra inanis sp. nov. 



Abra weberi sp. nov. 



Hysteroconcha (} Lamelliconcha) dazitzenbergi 



sp. nov. 

 Chione (Timoclea) crassisquamata sp. nov. 

 Cardiitm (Trachycardium) seivelli sp. nov. 

 Cardiiim (Trachycardium) beauforti sp nov. 

 Cardizim (Ctenocardia) translatum nom. nov. 

 6^arz (Gari) schepmani sp. nov. 

 G^arz (Gari) sibogai sp. nov. 

 Xylophaga tomlini sp. nov. 

 Myadora weberi sp. nov. 



Calopodium (Kennerlia) carinatum sp. nov. 

 Verticordia ' (Verticordia) crebrilirata sp. nov. 

 Verticordia (?) expansa sp. nov. 

 Lyonsiella pilula sp. nov. 

 Lyonsiella smithi sp. nov. 

 Poromya (Poromya) pergranosa sp. nov. 

 Poromya (Cetoconcha) gloriosa sp. nov. 

 Poromya (Cetoconcha) eximia sp. nov. 

 Poromya (Cetoconcha) butoni sp. nov. 

 Cuspidaria (Cuspidaria) mitis sp. nov. 

 Cuspidaria (Ctispidaria) convexa sp. nov. 

 CtLspidaria (Cuspidaria) gigantea sp. nov. 

 Cuspidaria (Cuspidaria) corrugata sp. nov. 

 Ctispidaria (Ctispidaria) tomlini sp. nov. 

 Ctispidaria (Cuspidaria) solidula sp. nov. 

 Cuspidaria (Cardiomya) sibogai sp. nov. 

 Cuspidaria (Cardiomya) persctilpta sp. nov. 

 Cuspidaria (Cardiomya) multicarinata sp. nov. 

 Cuspidaria (Cardiomya) semicostata sp. nov. 

 Cuspidaria ( Rhinoclama) dtibia sp. nov. 

 Myonera dautzenbergi sp. nov. 



The présence of such a large number of new forms is to be explained by the fact that 

 most of them are the resuit of deep-sea dredgings in an area hitherto almost unexplored. The 

 majority of thèse forms belong to the familles Nuculidse, Nuculanidae, Limidae, Vesicomyidae, 

 Lucinidae, Montacutidae, Verticordiidae, Poromyacidae and Cuspidariidae. Our knowledge of the 

 deep-sea forms of most of thèse familles is still far from complète, and further work in the 

 Indo-Pacific Région is sure to resuit in the discovery of many nev^r forms. The species discovered 

 by the "Siboga" Expédition exhibit close relationships either with the forms already known from 



