228 



Height 8 12, head 5 6'/ 2 , eye 7 13, eye distance 27.3 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 2 / 5 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 in dig. : Ikan sambilang betul (Mai. Batav.). 



Habitat: Java (Batavia!, Samarang, Surabaya, Passaruan); 

 Madura; Singapore; Pinang; Banka; Sumatra (Deli!, Bagan 

 api api ! Palembang); Borneo (Banjermassin, Sinkawang, Kota 

 Barti!, 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 IX. 1913, p. 520. 



B. 12; I. D. I. 4; 2. D. 112; A. 108; P. I. 13; V. 12; C. 17. 



Height 6,67,4; head 4,54,8; eye 812,8; 34,6 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 J / 3 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 



