A List of the Generie Names 
of Dibranehiate Cephalopoda with their type speeies. 
By 
William Evans Hoyle, 
National Museum of Wales, Cardiff. 
In view of the attention now being paid to questions of nomenclature and the importance 
attaching to the knowledge of the type speeies of each genus it appeared that the attempt to 
determine this in the case of a limited group of Mollusca might be a useful contribution to 
zoological literature and save trouble to future enquirers. 
In each case the ground upon which the type has been selected is given in square brackets 
and the more difficult cases have been discussed in notes at the end of the paper. The Rules and 
Recommendations ot the Nomenclature Commission of the International Zoological Congress (Science, 
vol. 26, pp. 520 523, Oct. 18, 1907) have been followed. Where I am certain that the type specimen 
of the type speeies exists in a particular collection the fact is stated and the mark (!) indicates 
that I have myself seen it. 
Those names which appear to be at present entitled to consideration are printed in heavier 
type, but several of them are of doubtful validity. 
Abralia , Gray, 1849. Onychoteuthis armata, Quoy &TGaimard, 1832 [sp. first mentioned]. 
Abraliopsis, Joubin, 1896. Enoploteuthis hoylei , Pfeffer, 1884 [designation] Hamburg Mus. 
Alloposus , Verrill, 1880. A.mollis, Verrill, 1880 [monotypic]. ü. S. Nat. Mus.! 
Ammonia, Breyn, 1732 [Pre-Linnean, no type given] (— Spirula ). 1 
Amphioctopus, P. Fischer, 1882. Octopus membranaceus, Quoy & Gaimard, 1832 [monotypic]. 
(— JPolypus). 
Amphitretus, Hoyle, 1885. A.pelagicus , Hoyle, 1885 [monotypic]. Brit. Mus.! 
Ancistrocheirus see Ancistrochirus. 
Ancistrochirus, Gray, 1849. Enoploteuthis lesueurii, d’Orbigny, 1845 [monotypic]. 
Anisoctus, Rafinesque, 1840. 2 
Architeuthis = Architeuthus (err. typ.). 
The name occurs in the “Museum Calonnianum” as “Geneus III” of “Testacea petrifacta”, but no 
characters are given and the specimens catalogued under this head are Ammonites. I cannot find any other instance of 
the use of the word in a generie sense by any post-Linnean author. [Since the above was in type I have found a 
reference to the use of Ammonia as a synonym of Argonauta by Knorr, but have not been able to verify it.] 
2 Anisoctus: two speeies are mentioned. — A. punctatus and A. bicolor, but the descriptions are so 
meagre that it is highly improbable they will ever be recognised again. Steenstrup suggested that they may be 
identical with Leachia. 
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