140 Dr. A. Giinther on a new Species a^Cynolebias. 



inclined to place it in the vicinity of Saccobranchus. The 



characters are : — 



Adipose tin low ; dorsal short, without spine, placed above 

 the ventrals ; anal long. Jaws and vomer with bands of 

 minute villiform teeth ; cleft of the mouth transverse, anterior, 

 of moderate width ; barbels eight. Eyes small ; head covered 

 with soft skin. Caudal with the upper portion prolonged, of 

 lanceolate shape (or rounded?). Ventrals five- or six-rayed. 

 Gill-membranes separated by a deep notch. Anterior verte- 

 bras coalescentc 



Dwarf Siluroids, inhabiting mountain-streams south of the 

 Brahmaputra, and of the Malayan peninsula. 



Ohjra elongata. 



D. 7. A. 19. P. 1/4. V. 5. Vert. 3 + 17/23. 



The depth of the body is one twelfth of the total length 

 (without caudal), the length of the head one sixth. Eye 

 behind the level of the angle of the mouth, small, about one 

 half of the length of the snout, and of the width of the inter- 

 orbital space. The maxillary barbels extend to the base of 

 the pectorals; mandibulary and nasal barbels short. Jaws 

 even in front. Base of the ventral fins nearer to the vent 

 than to the gill-opening. Pectoral spine stout, denticulated ; 

 the length of the pectoral fin is about one half of the distance 

 of its root from that of the ventral ; ventral fin of about the 

 same length. Vent midway between the root of the pectoral 

 and the end of the vertebral column. The lanceolate shape of 

 the caudal fin is caused by the prolongation of three rays of 

 the upper half of the fin. Dorsal as high as the body ; its 

 first ray opposite to the narrow base of the ventral. Anal 

 rather lower, scarcely as high as the tail above. Adipose fin 

 extremely low, like a narrow fold of the skin. 



Several specimens were obtained by Mr. Wood-Mason in 

 Tenasserim, the longest being 85 millim. long. 



XVIII. — On a new Species of Cynolebias /mm the Argentine 



Republic. By Dr. A. Gunthkr, F.R.S. &c. 



Cynolebias robustus. 



D. 20. A. 23. L. lat. ca. 35. L. transv. ca. 19. 



The height of the body is contained twice and two thirds in 



( 



D 





