74 
THE VOYAGE OF H.M.S. CHALLENGER. 
Hyalaea flara, d’Orbigny, 
Hyalasa forskahlii, Lesueur, 
Hyalaea gegenbauri, Pfeffer, 
Hyalaea imitans, Pfeffer, 
Hyalaea inermis, Gould, 
Hyalaea intermedia, Sowerby, . 
Hyalaea limbata, d’Orbigny, 
Hyalaea minuta, Sowerby, 
Hyalaea mucronata, Quoy and Gaimard, 
Carolina nutans, Abildgaard, . 
Hyalaea obtusa, Sowerby, 
Hyalaea papilionacea, Quoy and Gaimard, ] 
Hyalaea peroni, Lesueur, . . J 
Carolina pisum, M0rch, 
Hyalaea quadrispinosa, d’Orbigny, 
Hyalaea reeriana, Dunker, 
Hyalaea teniobranchea,¥ eron andLesueur, 
Hyalaea triacantha, Bronn, 
Hyalaea uncinata, Hoeninghaus, 
Hyalaea nncinatiformis, Pfeffer, 
Hyalaea raginellina, Cantraine, 
= Carolinia gibbosa . 
= Carolinia tridentata . 
= Carolinia gibbosa. 
= Carolinia injlexa. 
= Carolinia quadridentata. 
— Carolinia longirostris. 
— Carolinia quadridentata. 
— Carolinia trispinosa. 
— Carolinia tridentata. 
= Carolinia longirostris. 
— Carolinia tridentata. 
= Carolinia globulosa. 
= Carolinia quadridentata. 
— Carolinia trispinosa. 
— Carolinia tridentata. 
= Carolinia trispinosa. 
= Carolinia injlexa. 
— Carolinia uncinata. 
Carolinia injlexa. 
There remain the following eight titles, which represent genuine and distinct 
species : — 
Hyalaea trispinosa, Lesueur. 
Hyalaea quadridentata, Lesueur. 
Hyalaea longirostris, Lesueur. 
Hyalaea globulosa, Rang. 
Hyalaea gibbosa, Rang. 
Anomia tridentata, Forsk&I 
Hyalaea uncinata, Rang. 
Hyalaea injlexa, Lesueur. 
From the above list of synonyms of Carolinia, it appears that a number of generic 
titles have been applied to the preseut group of Thecosomata. 
One may well ask if all these names should be rejected and none retained, or, in 
other words, if the genus Carolinia is indeed homogeneous and indivisible. It appears 
to me so to be beyond dispute. 
I. Rheda, Hyalaea, Archonta, and Tricla are absolutely synonymous with Carolinia, 
for the simple reason that they refer to the same type, Anomia tridentata of Forsk&l. 
II. Pleuropus is a designation based on young stages of typical Carolinia, which 
Boas names “ Hyalaea, B.” 1 They refer to specimens in which the closing apparatus was 
not yet developed — Pleuropus pellucidus, Pleuropus longijilis, Pleuropus hargeri. Gray 
1 Spolia atlantiea, p. 92. 
