480 MEMOIRS OF THE CARNEGIE MUSEUM 



Lonchurus barbatus Block, Ichthyologia, 1793, pi. 360 (?). — Block and Schneider, 



Syst. Ichth., 1801, 102 (Surinam). — Cuvier and Valenciennes, Hist. Nat. 



Poiss., V, 1830, 193 (described from Bloch's type). 

 Lonchurus depressus Block and Schneider, Syst. Ichth., 1801, 102 (Surinam). — 



Cuvier and Valenciennes, Hist. Nat. Poiss., V, 1830, 195 (copied). — 



GtJNTHER, Catalogue, II, 1860, 317 (West Indies). 

 Lonchiurus lanceolatus Jordan and Evermann, Bull. U. S. Nat. Mus. No. 47, II, 



1895, 1481 (copied from Cuvier and Valenciennes). 

 Longchurus lanceolatus Hargreaves, Fishes of Brit. Guiana, Appendix, 1904, 2. 



Two specimens, 107-168 mm. Georgetown market. (C. M. Cat. No. 2478; 

 I. U. Cat. No. 12573.) 



Head 3.6-3.8; depth 4.5-4.8; D. X or XI-I,37-40; A. 11,7 or 8; scales 60-70 

 with pores, about fifty-five oblique series above the lateral line. Eye small, 8 in 

 the head; interorbital broad, very slightly convex, 2.5 times the eye, 3.5 in the 

 head. Body compressed, elongate; head depressed; dorsal profile elevated to 

 origin of dorsal ; snout twice the length of the eye, rounded, with a conspicuous 

 median pore; mouth moderately large, inferior, nearly horizontal; lower jaw included; 

 maxillary only partially concealed, extending the length of the eye behind the eye. 

 Preopcrcle somewhat cavernous, with entire bony margin; preorbitals cavernous 

 and turgid; suborbitals cavernous. Chin with two slender barbels a little longer 

 than the eye. Teeth in narrow villiform bands, a little larger above than below, 

 lacking at the symphysis of the premaxillaries. Pseudobranchise obsolete. 



Gill-rakers 5 -|- 13, with two irregular rows of minute spines directed back- 

 wards. 



Scales mostly ctenoid; head, except mental region, well covered with scales; 

 most of the scales of the breast and below the pectorals, as far back as the middle 

 of the ventrals, cycloid. First two series below the dorsals, the short dorsal sheath, 

 and the scales which cover the basal one-third of the soft dorsal, cycloid; the 

 scales at the base of the anal and caudal and those which cover the basal half of 

 the caudal are likewise cycloid. Anal naked. Lateral line suddenly decurved, 

 becoming straight over the anal. 



Dorsal and anal spines weak; last dorsal rays longest, 2.5 in the head. Caudal 

 long and pointed, 3.2 in the length (2.1 in the small specimens). Pectoral very 

 long, 1.5 times the head without the upper ray, which is very elongate, 1.75 in the 

 length in the large specimen, 2.25 in the small one. Ventrals rather small, 2 in the 

 head without the first ray, which is very elongate (being described by Bloch as 

 reaching the anal), 1.5 in the head in the larger of the present specimens. 



