12 DR. U. J. HANSEN ON THE 



Tho i)eep-Sea Isopod Airuropus hranchiatus, Bodd., and some 

 ]{cmarks on Bathynomus gigaoifeus, A. M.-Ed\v. By Dr. II. 

 J. Hansen (Copenhagen), F.M.L.S. 



[Eead IStli December, 1902.] 

 (Plate 4.) 



I. Anuroptjs liRANCUiATUs, Bcddavd. 



A RICH collection of Isopoda was secured by the ' ChallenQ-er ' 

 and described by P. E. Beddard. In Part II. of Ids Eeport (in 

 vol. xvii. 1886) the author asserts with good reason respecting 

 the form Anuropus hrc/ncJiiatus, Bedd. : "This genus is quite the 

 most remarkable that was obtained during the voyage ; it is 

 represented only by a single individual from deep water (1070 

 fathoms) in the "Western Pacific, off New Guinea." No expedition 

 has met with the animal again. Beddard refers Amcrojnis to 

 the family CymoLhoida', without further remarks on its position 

 within this very extensive group ; he devotes nearly four pages 

 (pp. 152-156) to the description and five figures on pi. vii. He 

 correctly points out that the uropoda have been developed as 

 supplementary respiratory organs, in all respects similar to the 

 pleopoda, and that no trace of eyes is to be found ; furthermore, 

 he describes the reduced antennula?, the antenna', legs, &c. But 

 his description of the mouth-parts is defective, and the figure 

 (fig. 4) representing these organs is insufficient, wherefore the 

 genus has been to a certain extent a puzzle to later systematic 

 writers. 



In 1890 I published a paper: " Cirolanidte et familite non- 

 nullte propinqua) Musei Hauniensis " (Kgl. Danske Vidensk. 

 Selsk. Skrifter. 6 Ea?kke, naturv. og matli. Afd. B. v. iii. (1890) 

 8, pp. 230-126, tab. 1-10), in which I attempted to bring about 

 some order in the extensive group, whieli may be named the 

 Cymothoida3 after one of its types. I referred all the animals 

 in question to six families : Cirolanida>, Corallanida", Alcironidse, 

 Barybrotida), -3^1gida^, and Cymotlioida^, and these have been 

 adopted by all authors who have since written on the group. 

 In 1805 1 attempted, in " Isopoden, Cumaceen und Stomato- 

 poden der Plankton-Expedition " (Ergebn. d. Plankt.-Exped. d. 

 ITumboldt-Stiftiing, B. tt. Gt. c), to produce an arrangement of 

 Ihe families of the order Isopoda. In oi-der to procure a tolerable 



