A List of the Generic Names 

 of Dibranehiate Cephalopoda with their type species. 



By 



William Evans Hoyle, 



National Museum of Wales, C'ardiff. 



In view of the attention now being paid to (juestions of nomenclature and the importance 

 attaciiinp to the knowledge of tlie type species of eacli genus it appeared tliat the attenijjt to 

 deteiniine this in the case of a limited group of Mollusca might be a usefui contribntion to 

 zoological literature and save trouble to future enquirers. 



In each case the ground upon whicli ttie type bas been selected is givcn in sipiare brackets 

 and the more difhcult cases have l)een discussed in notes at tlie end of tlie paper. The Ruies and 

 Hecommendations of the Nomenclature Conniiission of the International Zoological Congress (Science, 

 vol. ■_'(). pp. 520 — 523, Oct. IH, 1!I07) have been followed. Where I am certain that the tyi)e specimen 

 of the type species exists in a particnlar coUection the fact is stated and the mark (!j 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 donbtfu! validity. 



Abrafia, Gray. IS49. Onychüteidhis urmatii, Quoy \ Gaimard. 1832 [sp. first mentionedj. 

 Ahra/iojtfiis, Joubin. ISi)(;. Enoploteuthif! Iioi/le/, Pfeffer, 1884 [designation] Hamburg Mus. 

 A//o/>osiis, Verrill, l.s80. A. dioIU^. Verrill, 1880 [monotypic|. U. S. Nat. Mus. ! 

 Ammonia, Breyn, 1732 [Pre-Linnean, no type given] (= Sj^ifufa).^ 

 Amphioctopus, P. Fischer. 1882. Octopus memhranaceus, Quoy & Gaimard, 1832 [monotypic]. 



(^ Poljfpus). 

 A ni pfi it fetiis, Eoyle, 1885. A.pdagicm, Hoyle, 1885 [monotypicj. Brit. Mus. ! 

 Ancistrocheirus see Aneistrochirus. 



Aiifisft'ochiru.Sf Gray, 184!). EnoplutcKtlus lesueurii, d'Urbigny, 1845 |nion(it\pic|. 

 Anisoctus, Rafines(iue. 1840.^ 

 Architeuthis =^ Architeuthus (err. typ.). 



' The name occurs in the •' Museum Caionnianum " as " Geneus III " of •' Testacea iietrifarta ", but nn 

 characters are given and the spocimens eatalogued under this head are Ammonites. 1 cannot find any other instance of 

 the nse of the word in a generic sense by any post-Linnean author. [Since the above was in type I have found a 

 refcrence to the use of Ammonia as a synonym of Aryonauta by Knorr, but have not been able to verify it.] 



- Ani.foctus: two sjx'cies are mentioned. — A. punctatus and A. biro/or, but the descriptions are so 

 meagre that it is highly improbable they will ever be recognised again. Öteenstrup suggestcd that they may be 

 identical with Leachia. 



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