506 PROCEEDINGS OF THE ACADEMY OF [July, 



nostrils far apart near edge of snout and each in a fleshy tube equal to 

 about half of orbit. Posterior nostril small, lateral, close in front of 

 eye and nearly level with upper margin of i)U})il. Interorbital space 

 broad, flattened, and a trifle elevated. Opercle with a somewhat nar- 

 row fleshy gill-flap. Top of head broad and more or less flattened. 



Gill-opening large, extending forward till about an eye-diameter 

 posterior to posterior rim of orbit, and branch iostegal membrane form- 

 ing a broad fold over isthmus. Gill-rakers small short broad asperous 

 tubercles, and about 7 in number on first arch. Filaments small, nearly 

 equal to pupil. Accessory branchial cavity large. 



Scales rather small, cycloid, striate, and those on bases of caudal and 

 pectoral fins small. On top of head scales more or less osseous and 

 cemented together. Same on opercular region and on cheek. Scales 

 on costal region a trifle larger than elsewhere. Lateral line a Fittle high 

 or superior at first, then dro]:)ping one or two scales till over vent, after 

 which it continues medianly to caudal. Tubes simple. 



Dorsal of nearly uniform height, long, and beginning about o\^er 

 first third of pectoral. Origin of anal about midway between tip of 

 maxillarj' posteriorly and base of caudal, and similar to dorsal. Caudal 

 rounded and middle rays longest. Pectoral long, rounded, reaching 

 about f of distance to anal, and middle rays longest. Ventral inserted 

 just behind base of pectoral or a little before origin of dorsal, small or 

 reaching about half way to vent. Vent close to origin of anal. Caudal 

 peduncle compressed, and its least depth about | its length. 



Color in alcohol a livid plumbeous-brown, ventral but little paler 

 or somewhat dirty white. Each scale on side marked with a slaty or 

 dusky spot. Fins more or less slaty-brown, venti'als w^hitish. Tip of 

 each dorsal and anal ray whitish. Indistinct oblique dusky bars or 

 bands on dorsal and anal, and most distinct on last rays. Traces of 

 man}^ indistinct transverse narrow or wavy dusky cross-bars on caudal. 

 Margin of pectoral narrowly pale. Lower surface of head pale livid 

 slaty with round whitish blotches or spots. Iris slaty. 

 Length 8 inches. 



Three examples. Baram, Borneo. Harrison and Hiller. 

 Dr. Steindaehner's figure differs a little in the absence of the blackish 

 oblique bars on the dorsal which are very distinct in one of my exam- 

 ples. 



73. Ophicephalus pleurophthalmus Bleeker. 



One example from Kapuas. Harrison and Hiller. 



74. Ophicephalus lucius Cuvier. 



Two examples from Baram. Harrison and Hiller. 



