44 THE VOYAGE OF H.M.S. CHALLENGER. 
3. Seven names refer to young stages of the Thecosomata of the genus Cavolinia, 
viz. : — 
Cleodora compressa, Souleyet = Cavolinia trispinosa. 
Cleodora curvata, Souleyet = Cavolinia uncinata . 
Clio depressa, Gray = Cleodora compressa, Souleyet = Cavolinia trispinosa. 
Clio pellucidum, Gray = Pleuropus pellucidus, Eschscholtz = Cavolinia injlexa. 
Balantium rugosum , Gray =Hyalaea rugosa, d’Orbigny = Cavolinia gibbosa. 
Cleodora pygmsea, Boas = Cavolinia quadridentata. 
Cleodora trijilis, Troschel = Cavolinia > sp. 
The attentive study of the forms designated by the remaining specific titles shows 
that thirty -three of these ought to be discarded, and considered only as synonyms of 
the fourteen remaining species. 
Creseis acus, Eschscholtz, 
Balantium bicarinatum, Benson, 
Cleodora brownii, de Blainville, 
Creseis caligula, Eschscholtz, 
Clio caudata, Linne, . 
Creseis clava, Rang, 
Creseis compressa, Eschscholtz, . 
Creseis conoidea, 0. Costa, 
Hyalsea corniformis, d’Orbigny, 
Creseis cornucopise, Eschscholtz, 
Cleodora exacuta, Gould, 
Cleodora falcata, Gould, 
Cleodora falcata, Pfeffer, 
Cleodora flexa, Pfeffer, 
Cleodora inflata, Souleyet, 
Cleodora lamartinieri, Rang, . 
Hyalsea lanceolata, Lesueur, 
Cleodora lessoni, Rang, 
Cleodora lobata, Sowerby, 
Cleodora martensii, Pfeffer, 
Creseis monotis, Troschel, 
Cleodora munda, Gould, 
Creseis phseostoma, Troschel, 
Creseis placida, Gould, 
Cleodora quadrispinosa, Rang, 
Styliola recta, Lesueur, 
= Creseis acicula, Rang. 
= Cleodora balantium, Rang. 
= Clio pyramidata, Linne. 
= Creseis virgula, Rang. 
= f Clio pyramidata, Linne. 
= Creseis acicula, Rang. 
= Creseis striata, Rang. 
= Creseis conica, Eschscholtz. 
= Creseis virgula, Rang. 
= Creseis virgula, Rang. 
= Clio pyramidata, Linne. 
= Creseis virgula, Rang. 
= Balantium politum, Craven, MS. 
= Creseis virgula, Rang. 
= Cleodora balantium, Rang (young). 
= Clio pyramidata, Linne. 
= Clio pyramidata, Linne. 
= Ilyalsea cuspidata, Bose. 
= Clio pyramidata, Linne. 
= Clio pyramidata, Linne. 
= Creseis striata, Rang. 
= Creseis virgula, Rang. 
= Creseis striata, Rang. 
= Creseis virgula, Rang. 
= Hyalsea cuspidata, Bose. 
= Cleodora subula, Quoy and Gaimard. 
