10 Oberholser, Genera and Species of Cygnince. [ 



Emu 

 t J«ly 



sophical Institute of Canterbury, New Zealand, held on 3rd October, 

 1889, we have not been able to locate a reference in The Transac- 

 tions of the New Zealand Institute earlier than vol. xxiv., for 1891 

 (1892), p. 188, which, it will be observed, is considerably later than 

 the note in The Ibis. It apparently has never been fully nor 

 formally described, and has been either overlooked or ignored by . 

 writers on the Swans, including Count Salvadori and Dr. Sharpe. 

 I have not had opportunity to examine any pertinent material, 

 but Dr. Henry O. Forbes, the discoverer of the species, assures me 

 in a recent letter that he still considers it different from Chenopis 

 atrata. Since it was undoubtedly indigenous to New Zealand, 

 there is much reason to suppose that it is really distinct, though 

 perhaps but sub-specifically. 



Chenopis nanus (De Vis). 



Chenopis nanus, De Vis, Annals Queensland Museum, No. 6, 

 1905, P- 13- 



Chars, sp. — Similar to Chenopis atrata, but .about one-third 

 smaller ; humerus having the trochlea ulnaris, the trochlea radialis, 

 and the exterior epicondyle relatively smaller ; tibia having its 

 shaft actually as well as relatively broader, and also the bridge 

 over the extensor tendon broader. 



Type Locality. — Lower Cooper's Creek, Lake Eyre, South Aus- 

 tralia. 



Geographical Distribution. — Vicinity of Lake Eyre, South Aus- 

 tralia. 



This apparently distinct species, of Pliocene or Early Pleistocene 

 age, was based on jx»rtions of the coracoid, humerus, tibia, tarso- 

 metatarsus, and pelvis. The type locality aside, remains were 

 recorded by the describer from Malkuni, Wurdulumankula, and 

 Unduwumpa, all in the region about Lake Eyre. 



Genus Arch.eocycnus (De Vis). 



Archceocycnus, De Vis, Annals Queensland Museum, No. 6, 1905, 

 p. II. 



Type. — Archceocycnus lacustris (De Vis). 



Chars, gen. — Similar to Chenopis, but sternal joint of coracoid 

 relatively larger and more deeply locked ; humerus having an 

 isolated tubercle proximad of the interior epicondyle ; radius 

 having its shaft more trihedral, its head relatively smaller ; tarso- 

 metatarsal ridges guarding the flexor tendons of the foot stronger. 



Geographical Distribution. — Vicinity of Lake Eyre, South Aus- 

 tralia. 



Arch.eocycnus lacustris (De Vis). 



Archceocycnus lacustris, De Vis, Annals Queensland Museum, No. 

 6, 1905, p. II. 



Chars, sp. — Those of the genus. Additionally it differs from 

 Chenopis atrata as follows : — Ridge separating the upper surface of 



