414 



Monopterns javanicus Kaup, Cat. Apod, fish, 1856, p. 123. 

 Monopterus javanensis Bleeker, Atl. Ichth. IV. 1864, p. 118. 

 Monopterus javanensis Gunther, Cat. Brit. Mus. VIII. 1870, p. 14. 

 Monopterus javanensis Day, Fishes of India 4. 1878 1 888, p. 656. 

 Monopterus albus Jordan & Snyder, Proc. U.S. Nat. Mus. XXIII. 1901, p. 838. 

 Cryptophthalimts robustvs Franz, Abh. Bayer. Akad. Miinchen 4. Suppl. Bd. 

 1910, p. 15. 



Height 17 26; head 10 13, 7'/ 2 or more in trunk. Tail 2 '/ a 

 to nearly 3 times in head and trunk. Eye about 13 in large 

 specimens, about 2.5 in length of snout, situated above middle 

 of maxillary. Cleft of mouth 2.4 to 2.7 in length of head. 

 Origin of dorsal somewhat behind vent. Upper surface of 

 preserved specimens brownish or greyish above, yellowish or 

 whitish below. Length 875 mm. 



Nomen in dig. : Belut (Sundan.); Welut (Javan.); Lindung 

 (Malay.). 



Habitat: All over Sumatra, Borneo, Java in fresh water of 

 rivers, brooks, rice ditches, ponds, lakes. We have also speci- 

 mens from heights of 3000 feet (Mount Pangerango near Suka- 

 bumi, Java); Lombok (Ampenan, Lake Narmade); Sumbawa; 

 Banka; Bintang; Natuna Islands; Celebes (Lake Sidenreng!, 

 Pampanuwa, Makassar); Wahai (Ceram). Asiatic continent 

 from Malacca, Burma and Siam to Northern China; Chinese 

 Islands; Formosa and Japan. 



This fish is capable of living a considerable time out of water 

 and of burying itself in the mud when the water is drying up. 



2. Macrotrema Regan. 



(C. TATE REGAN, Ann. Mag. Nat. Hist. (8) IX. 1912, p. 390). 



Body naked, elongate, cylindrical; the tail greatly com- 

 pressed, short and tapering. Lateral line present. Lips well 

 developed, the lower one reverted over the lower jaw. Posterior 

 nostrils lanceolate openings, situated obliquely above the eye; 

 anterior nostrils, which are smaller and have a raised margin, 

 near tip of snout. Eye minute, covered by skin. Dorsal and 

 anal low, rayless folds of the skin, confluent with the small 

 caudal, which has 10 rays. Pectorals and ventrals absent. The 

 setaceous teeth, which form a single series on the intermaxil- 

 laries, become crowded and form a triangular figure near the 

 symphysis. The palatal teeth are obtusely conical and stronger 

 and placed in a single arched series. Those of the lower jaw 



