228 
Height 8—12, head 5—6'/,, eye 7—13, eye distance 2'/,—4 
diameters of eye. Snout about thrice as long as eye. Nasal 
barbels extending to the nape of the neck or at least two eye 
diameters behind hindmargin of eye. Maxillary barbels reaching 
a little farther, mandibulary barbels to branchial opening. 
Mental barbels much shorter. First dorsal as long as snout and 
eye, its spine about ?/, of head, serrated on both edges. 
Second dorsal lower, of uniform height, similar to anal. Caudal 
rounded. Ventrals shorter than snout. Pectorals as long as or 
a little longer than first dorsal, their spine similar to that of 
the first dorsal. Maxillary band of teeth 3 times broader than 
its antero-posterior length, its conical teeth in about 3 rows; 
each mandibulary band semicrescentic, mesially with 4—5 rows 
of teeth, narrowing laterally to one row. Crescentic vomerine 
band, in the middle with about 4 rows of molar teeth, nar- 
rowing to two and finally to one row of teeth. About 20 
gillrakers on the total first branchial arch, the 4 most ventral 
ones very short. Colour in alcohol brown, vertical fin edged 
with black. Length by exception over 900 mm. 
Nomen indig.: Ikan sambilang betul (Mal. Batav.). 
Habitat: Java (Batavia!, Samarang, Surabaya, Passaruan); 
Madura; Singapore; Pinang; Banka; Sumatra (Deli!, Bagan 
api api! Palembang); Borneo (Banjermassin, Sinkawang, Kota 
Baru!, Sarawak); Celebes (Macassar! Pare Pare!, Menado); 
Aru Islands!; British N. Guinea. — Andamans, Burmah, British 
India and Ceylon. 
In sea, brackish water and rivers. 
2. Plotosus papuensis M. Web. [Fig. 91. p. 227]. 
Plotosus papuensis Max Weber, Notes Leyden Museum XXXII. 1910, p. 228. 
Plotosus papuensis Max Weber, Nova Guinea 1X. 1913, p. 520. 
Bla2; as Do 1.64522..D: 1125 Ay 10830P Se) Vie oae eee 
Height 6,6—7,4; head 4,5—4,8; eye 8—12,8; 3—4,6 in 
snout, which is about as long as or a little longer than the 
interorbital space. Barbels nearly equal, the nasal one extends 
nearly to the nape. First dorsal equal to or a little shorter 
than head without snout. Dorsal spine '/, shorter, serrated on 
both edges. Second dorsal lower than head, of uniform height, 
similar to anal. Tip of caudal rounded. Ventrals reaching anal, 
considerably shorter than pectorals. Pectorals rounded, as long 
