28 Pisces. 
PISCES. 
Chondrostoma oxyr[f\hynchum^ p. 134, fig. 20, cyriy p. 137, fig. 21 ; 
Kessler, op. cit. : spp. nn. 
Notemigonus ischanusj sp. n., Jordan, 1. c. p, 364, Upper Georgia. 
Aspius erythroatomus^ sp. n., Kessler, op. cit. p. 143. 
Alhurma fiUppiif p. 163, hohenacJceri, p. punctulatua^ p. 159, fig, 22 ; 
id. 1. c. : spp. nn. 
Acanthohrama hogdanovi, sp. n., id. 1. c. p. 166. 
Homaloptera Ulineata^ Blyth, = Nemachilua aerpentariua^ Day, P = 
aucatiOy H. B. ; Day, op. cit. p. 626, pi. cxxi. fig. 8. 
Homaloptera (Octonema) rotundicauday Mart., figured by Martens, 
op. cit. p. 403, pi. X. figs. 1 & 2. 
Nemachilua hrandtiy sp. n., Kessler, op. cit. p. 174, fig. 23- 
Cobitia hohenackeriy p. 177, aralenaia ?, p. 184, id. 1. c. : spp. nn. 
Olupeidj^. 
j On Races of Herrings observed in the Sound ; G. Winther, Nord. 
' Tidssk. Fisk. 1876. 
' " Engraulia. On the hitherto undescribed decussation of the optic 
nerve ; Solger, Ber. Ges. Halle, 1877, p. 9. 
Engraulia tapirulua^ sp. n., Cope, P. Am. Phil. Soc. xvii. p. 45, Peru. 
Clupeonella grimmi, sp. n,, Kessler, op. cit. p. 187. 
/ Megalopa. A species observed at Toro Rapids, Lake Nicaragua. Not 
/ hitherto known to occur in isolated bodies of fresh water so far from the 
( sea. Bransford, P. Ac. Philad. 1877, p. 187. 
Bathythrissid.® (Fam. Nov.). 
Body oblong, with rounded abdomen, covered with cycloid scales ; 
head naked; no barbels. Margin of the upper jaw formed by the 
intermaxillaries mesially, and by the maxillaries laterally. Opercular 
apparatus complete. No adipose fin ; dorsal fin much elongate, many- 
rayed ; anal fin short. Stomach with a blind sac ; pyloric appendages 
numerous. Gill-apparatus well developed ; pseudobranchiae ; gill-open- 
ings wide ; an air-bladder. Ova very small ; ovaries without duct. 
Bathythriaaa, g. u. Body covered with scales of moderate size. Head 
narrow, oblong, with the muciferous channels much developed. Eye 
large. Mouth narrow, coregonoid, with bands of minute teeth embedded 
in the thick lips ; maxillary with a marginal row of very small teeth. 
Caudal fin forked, with a dense layer of small scales. Air-bladder with 
very thick walls, terminating in two short horns in front, pointed behind. 
Bathyihriaaa dorsalis, sp. n., Gunther, Ann. N. H. (4) xx. p. 443, 
Inosima, Japan. 
OsTEOQLOSSIDiE. 
Osteoglossum formosum, Miill., figured by Martens, 1. c. pi. xiii. 
Hyodontidaj:. 
Hyodon selenopa, sp. n., Jordan, Bull. Nat. Mus. x. p. 67, Tennessee and 
Alabama. 
