NO. 1533. RE VIE W F COBITOIDM OF THE A M IJR BA SIN—BER G. 



437 



The genus ZTssu7'la estaV)lished by M. Nikolsk}^ is based on an error. 

 UssKria is described as havino- onl}^ 8 cirri (2 on the mandible), other- 

 wise as in Misgurnus; but after examining the type specimens No. 

 10655 and No. 12791 1 find in both 10 cirri (4 on the mandible), 

 otherwise these specimens are quite identical with J/, fossllis 

 anguillicaudat vs. 



We have many specimens from the basin of Amur: basin of Khanka 

 or Haupa Lake (No. 8411), Ussuri at Khabarovsk (No. 10655), Kerulen 

 River (tributary of Argun; No. 12791); Da-chu-ang, tributary of 

 Sungari (No. 13703), from China; Peking, Pikua in Kansu, Hui-hsien 

 in S. Kansu. from Japan. 



LEFUA Herzenstein. 



Octonema Herzenstein, Trucl. Soc. Natur. Petersburg, XIX, 1887, p. 47 {plesl:ei= 



cosiata; name preoccupied). 

 Lefua Herzenstein, Przewalski's Fische, 1888, p. 91 {j}k'skei=coslaia) . 

 Elixis Jord.\n and Fowler, Proc. U. S. Nat. Mu.s., XXVI, 1903, p. 768 {nikkoms). 



Cirri 8, four rosti'al, two maxillar}^ and two at the anterior nostrils. 

 Scales present. No erectile spine below the eye. Dorsal tin about 

 over the ventral, with few rays; caudal rounded. Air bUidder with a 

 posterior part free in the abdominal cavity. Two species: L. Cantata 

 in the basin of Amur, N. China, and Korea; Z. ni'kkonis in N. Japan. 



2. LEFUA COSTATA (Kessler). 



Diplophysa costata Kessler in Przewalski, Mongolia, and the Land of Tanguts, 

 II, 1876, Fishe.s, p. 29, pi. in, iig. 3 (Dalai-nor Lake, inner basin of E. Mon- 

 golia, No. 2477). 



Octonema jjleskei Herzenstein, Trud. Soc. Nat., Petersburg, XIX, 1887, p. 48, 

 fig. 5 ( Khanka Lake, No. 7209) . 



Lefua costata Herzenstein, Przewalski's Fiache, 1888, p. 93 (No. 2477). 



Lefua pleskei Herzenstein, Przewalski's Fische, 1888, p. 95 (No. 7209). 



