94 
THE VOYAGE OE H.M.S. CHALLENGED. 
Cymbulia quadripunctata, Gegen- 
baur. 
Cymbulia radiata, Quoy and Gaimard. 
Tiedemannia charybdis, Troschel. 
Tiedemannia chrysosticta, Krohn. 
Tiedemannia creniptera, Krohn. 
Tiedemannia napolitana, Delle 
Chiaje. 
Tiedemannia scyllse, Troschel. 
Corolla spectabilis, Dali. 
Gleba cor data, Forskal. 
But it is necessary to note that among the above there are : — 
1. One title applied to a Gymnosomatous form, Cymbulia norfolkensis, Quoy and 
Gaimard, which is a Halopsyche (see Report on Gymnosomata). 1 
2. Numerous titles applied to young stages, which have been regarded as distinct 
forms (after the embryonic development there are yet notable external differences between 
the very young Cymbuliidse and the adult forms) : — 
Cymbulia punctata, Quoy and Gaimard, Tiedemannia scylla, Troschel, 
Cymbulia radiata, Quoy and Gaimard, Tiedemannia charybdis, Troschel, 
are certainly young forms of Gleba. So too the Cymbulia cirroptera of Gegenbaur is 
in all probability only the young form of this genus Gleba, nor can I regard Cymbulia 
quadripunctata, Gegenbaur, as an adult individual. 
3. Three titles are synonyms for other species : — 
Cymbulia proboscidea, Gray = Cymbulia peroni, de Blainville. 
Tiedemannia napolitana, Delle Chiaje, 
Tiedemannia creniptera, Krohn, 
There thus remain six titles : — 
Cymbulia calceola, Verrill. 
Cymbulia peroni, de Blainville. 
Cymbulia ovata, Quoy and Gaimard. 
Gleba cor data, Forsk&l. 
Tiedemannia chrysosticta, Krohn. 
Corolla spectabilis, Dali. 
Gleba cordata, Forskal. 
It is necessary now to note that of these six species there are only two which are 
really well known. These are Cymbulia peroni and Gleba cordata, both from the 
Mediterranean. The others are very imperfectly known, as for instance Cymbulia 
ovata and Gleba spectabilis. The latter and Tiedemannia chrysosticta have not yet 
been figured ; of Cymbulia ovata and Gleba spectabilis I have been able to examine 
specimens, but these were unfortunately in an insufficient state of preservation. 
Iu utilising the information which we possess in regard to these six forms, we have 
to face the difficulty which I have mentioned above, the difficulty namely of distributing 
the different forms between the two genera Gleba and Cymbulia, or, in other words, of 
establishing the exact limits and differential characteristics of the two genera. 
1 Zool. Chall. Exp., pt. lviii. p. 55. 
