466 PROCEEDINGS OF THE ACADEMY OF [July, 



continuous, composed of short horizontally exposed tubes following 

 one another and not arborescent. 



Dorsal rather long, inserted about first third in total length of fish, 

 first ray flexible, and not quite as long as second, which is longest, 

 others graduated down. Anal long basally. Same region also overlaid 

 by a cutaneous membrane extending out on half of depth of fin except 

 posteriorly, Avhere it gradually recedes till about ninth ray from end, 

 where only a little less than a fourth is covered. First few graduated 

 rays of anal enveloped in basal membrane. Caudal comparatively 

 small , forked and lower loV)e longer. Pectoral rather broadly expanded, 

 reaching a little past base of dorsal, spine flexible distally, and second, 

 and third rays longest. Ventral small, second and third developed 

 rays longest, rounded, basally covered with membrane which is sharply 

 defined like that of anal though not extending proportionately so far 

 out, and inserted about opposite origin of dorsal. Pectoral w^ith simi- 

 lar membrane to that of ventral basally. Anal begins a little before 

 tip of depressed ventral, and vent in this space close behind ventral. 



Color in alcohol deep brown. Abdomen and lower surface of head 

 dull white. Fins brown, becoming dusky marginally on caudal and 

 anal. Dorsal dusky-brown, and ventral more paler or Avhitish than 

 pectoral. Upper edge of pectoral dusky. Alargin of mandible brown- 

 ish, composed of scattered brown dots of minute size gradually fading 

 off to white of lower surface. Iris slaty brown. 



liength 21 f inches. 



Three examples, largest described above. The others do not differ, 

 showing about the same fin and branchiostegal radii, though the line 

 of insertion of dorsal and anal is a trifle more anterior. 

 16. Ompok jaynei sp. nov. 



Head 4| ; depth 4f ; D. i, 3: A. 56; P. I, 12; V. 7; width of head If 

 in its length; depth of head, at posterior margin of eye, 2; length of 

 dorsal li; pectoral lyV; ventral 2f ; base of caudal 4|; snout 3, from 

 tip of upper jaw; width of mouth 1|; interorbital space If; maxillary 

 3f ; pectoral spine 2J; eye 4f in interorbital space: base of anal If in 

 total length of fish. 



Body long, compressed, upper profile rather evenly curved from tip 

 of snout to dorsal and then more or less straight to caudal. Greatest 

 depth at origin of ventral. 



Head deep, flattened below, depressed in front, and somewhat con- 

 stricted above posteriorly. Snout broad, depressed, and upper margin 

 of head broadly convex when viewed above. Mouth broad, with rather 

 thin lips, and mandible projecting. Eye small, circular, lateral, 



