EEPOET ON THE PTEEOPODA. 
7 
II. Twenty-five are duplicates, and ought therefore to be retained simply as 
synonyms of Thecosomatous genera : — 
Archonta, Montfort, . 
Balantium, Leach, 
Campylonaus, Gray, . 
Cleoclora, Peron and Lesueur, . 
Corolla, Dali, 
Creseis, Rang, 
Cuvieria, Rang, 
Diacria, Gray, 
Embolus, Jeffreys, 
Euromus, Adams, 
LLeliconoides, d’Orbigny, 
Helicophora, Gray, 
Heterofusus, Fleming, 
Hyalsea, Lamarck, 
Hyalocylis, Fol, 
Orbignyia, A. Adams, 
Pleuropus, Eschscholtz, 
Protomedea, 0 . G. Costa, 
Rheda, Humphreys, . 
Scsea, Philippi, 
Spiratella, de Blainville, 
Spirialis, Eydoux and Souley et, 
Styliola, Lesueur, 
Tiedemannia, delle Chiaje, 
Tricla, Oken, . 
= Carolina, Abildgaard. 
= Clio, Linne. 
= Peraclis, Forbes. 
= Clio, Linne. 
= Gleba, Forskal. 
= Clio, Linne. 
= Curie rina, Boas. 
= Cavolinia, Abildgaard. 
= Limacina, Cuvier. 
= Peraclis, Forbes. 
= Limacina, Cuvier. 
— Limacina, Cuvier. 
— Limacina, Cuvier. 
= Cavolinia, Abildgaard. 
= Clio, Linne. 
= Cavolinia, Abildgaard. 
= Cavolinia, Abildgaard. 
= Limacina, Cuvier. 
= Cavolinia, Abildgaard. 
= Limacina, Cuvier. 
— Limacina, Cuvier. 
— Limacina, Cuvier. 
= Clio, Linne. 
= Gleba, Forskal. 
— Cavolinia, Abildgaard. 
As to the genus Valvatina, Bornemann , 1 Fischer 2 is evidently in error in stating that 
it includes living Pteropods, for all the forms which he describes are fossils. It is like- 
wise probable that most of the latter are not even Pteropods. 
The genera Euchilotheca, Fischer ; Flabellulum, Bellardi ; Gamopleura, Bellardi ; 
Poculina, Bellardi ; Tibiella, Meyer, and the genus Valvatina mentioned above are only 
known as Tertiary fossils ; and they are further very closely allied to various extant 
genera. 
I completely abstract certain primary fossils usually referred to the Pteropoda. I 
1 Die microscop ische Fauna des Septarienthones von Hermsdorf bei Berlin, Zeitsclir. d. deutsch. geol. Gesellsch., Bd. vii. 
p. 18 . 
2 Manuel de Conchy liologie, p. 430. 
