12 o. NORDGÅRD [ 1922 



of Ihe North Atlantic it is probable the same species, A. dux, which 

 has been recorded. On the American, side the species of Archifeu- 

 thiis have got olher names (see W. E. Hoylk, 1886, p. 35). An Archi- 

 ieiithus sp. is recorded from the Azores by L. Joubin, (1900, p. 46). 

 The hig mandibles^ of such a one were taken in the stomach of a 

 cachalot (Physeter macrocephahis Lin.). The sperm whale is 

 l-cnown as a typical teuthophag (see Collett, 1911 — 1912, p. 634 

 — 635), and the wliale has often cirkiilar marks on the skin from 

 struggle wilh Architeuthus (MurAay and Hjort, 1912, j). 635, fig. 

 486). These marks are caused by the dentale homy ring of tlie 

 siickers. In the specimen of A. dux from Hellandsjo (^7^ 1916) I 

 found the diameter of the greater horny rings to be ca. 20 mm. The 

 circular marks in Murray and Hjort's fig. 486 have about the 

 same diameter. Further facts about the marks on tlie slcin of some 

 whales are given by Ad. S. Jkxsen (1915, 1916). 



Ominatostrepbes sagittatus Lamarck. 



Ommalostrephcs todanis G. O. Saks, 1878, p. 334, pi. 30. 

 Todarodcs safjillatiis Løxneberg, 1891, p. 33. 

 Ominaloslrcphat sctfiittatas M.\ssy, 1909, p. 32. 



In the Trondhjem Museum there are 2 specimens of this species. 

 Both are certainly from the Trondhjem region. The one which is 

 labelled Trondhjem 1869 has a mantle length of 41 cm. 



Distribution. — Northern Norway to the Mediterranean and 

 the Azores. Biologicai details of this species are given bv G. O. Sars, 

 (1878, p. 334), Lo Bianco (1899, p. 532) and Johan Hjort in 

 Mi'RRAY and Hjort's excellent book (1912, p. 648). 



The Strange name of Ommatostrephes is explained as «eyeturner» 

 See R. A. Philipi, Handbuch der Conchvliologie und Malaco- 

 zoologie, p. 99. Halle, 1853). 



LIST OF P APEKS. 



O. Arel, Paleobiologie der Gephalopoden aus der Gruppe der Di- 

 branchiaten. Jena, 1916. 



A. Appellof, Teutologische Beitriige. Bemerkungen iiber die auf 

 der norwegischen Nordmeer-Expedition gesammelten 

 Gephalopoden. Bergens Museums Aarbok 1892, Nr. 1. 



E.Becher, Mollusken von Jan Mayen. Die Osterreichische Polar- 

 station Jan Maven 1882—1883. Beobachtungs-Ergebnisse, 

 Bd. 3. 



^ See Joubin, 1900, pi. 14, figs. 1, 2. 



