1905.] NATURAL SCIENCES OF PHILADELPHIA. 477 



same; of anal If; of pectoral 3f in head and trunk : of ventral 4f ; least 

 depth of caudal peduncle 3. 



Bod}'^ slender, depressed, elongate, convexly rounded above and flat- 

 tened below, only caudal region of tnuik compressed. Greatest depth 

 about origin of dorsal. Least depth of caudal peduncle abovit If in 

 its length. 



Head triangular when viewed above, tip rounded, convex above 

 and flattened below. Snout more or less depressed above. Eye large, 

 superior, rounded, and a trifle posterior in head. Mouth convex, 

 rather small, and jaws cartilaginous. Four superior barbels on upper 

 lip, and one at each corner of mouth which is a little the longer. 

 Tongue not free or distinct. Interorbital space slightly convex. 

 Nostrils close together, posterior much larger, and close to front of eye. 



Gill-opening lateral, a little less than width of broad isthmus. 



Scales moderately small, those on anterior part of body smaller than 

 elsewliere. Breast naked and scales on costal region not altogether 

 extending over median ventral line. Head and fins naked. Lateral 

 line of simple tubes, and continuous to base of caudal midway on side. 



Origin of dorsal a little behind origin of ventral or a little nearer 

 base of caudal than tip of snout. Origin of anal a little nearer base of 

 caudal than origin of ventral, and reaching about f of distance to for- 

 mer. Caudal emarginate. Pectoral large, reaching ventral. A^entral 

 reaching for f of distance to anal. 



Color in arrack brown with about 5 diffuse brown blotches on back. 

 Lower surface whitish. Fins whitish, dorsal and caudal slightly 

 darker, and all with several brown blotches. Iris slaty. 



Length If inches. 



Fifteen examples. 



GASTROMYZONIN^. 



Ventral fins united to form a disk. 

 28. Gastromyzon borneensis Giinther.^o 



Head 4f ; depth at origin of dorsal 6; greatest width of body 3^; 



30 Ann. Mag. Nat. Hist. Lond., XIV (4), 1874, p. 454. Mountain torrents of 

 the interior oi" Borneo. "These specimens come from the sources of the Minga- 

 long river. " (British Museum.) Steindachner, Abhand. Senck. Nat. Ges. Frank- 

 furt, XXV (2) 1901, p. 4.55. Aus dem Baram-Flusse auf Borneo. THerr Prof. 



Kukenthal.) Vaillant, Notes Leijd. Mus., XXIV, November, 1902. pp. 18. 23. 



Haut Sibau. (Kapoeas superieur — Bassin du Sibau.) Bloeoe. (Mahakan ou 

 Koetei superieur.) 



Lepidoglanis monticola Vaillant, Congr. Int. Zool. Paris, Compt. Rend., 18S9 

 (1890), p. 82. La montagne de Kina Balu. Borneo. (M. Whitehead.) 



Gastromyzon monticola Vaillant, Bull. Soc. Philomathiquc, Paris, Compt. Rend., 



Ill (8), 1890-91 (1891), p. 6. [Remark.] Vaillant, Nour. Arch. Mus. Hist. 



Nat. Paris, V (3), 1893, p. 94, PL 1. figs. 3-3e. Kina-Balou. (M. Whitehead.) 



