30. AULOPTOE. 171 



a. Five inches long. Gnari Khorsum. From the Collection of Messrs. 



von Schlagintweit. 



b. Four inclics long. Ladak. From the Collection of Messrs. von 



Schlagintweit. 



c. Ten inches long. Delhi (?). From the Collection of Messrs. von 



Schlagintweit. 



29. DIPTYCHUS. 



Diptychus, Steindachner, Verh. zool.-hot. Ges. Wien, 186G, p. 787. 



Only the sides of the body and tail are more or less covered with 

 very small scales ; lateral line running along the middle of the tail. 

 Dorsal fin without osseous ray, opposite the vcntrals ; anal fin very 

 short ; caudal forked. Snout obtuse, mouth inferior, curved ; lower 

 jaw vnth. a cutting anterior edge covered with a horny sheath, 

 behind which is a distiuct, uninterrupted labial fold, continuous with 

 the upper lip. A barbel at the angle of the mouth. Vent and 

 anal tin in a scaly sheath. Gill-opening rather narrow, the attach- 

 ment of the gill-membrane to the isthmus takes place behind the 

 pneopercular angle. Pharyngeal teeth compressed, 4 . 3 — 3 . 4. 



Himalayas; Tibet. 



1. Diptychus maculatus. 

 Steindachner, I. c. p. 788, taf. 13. fig. 5. 



D. 11. A. 7. V. 9. 



Body elongate, its depth being less than the length of the head, 

 which is contained four times and one-fourth in the total (without 

 caudal). Eye of moderate size, two-ninths or one-fifth of the length 

 of the head. Pectoral as long as the head, without snout. Barbel 

 not quite as long as the eye. The root of the ventral fin is opposite to 

 the last ray of the dorsal fin, the origin of which is somewhat nearer 

 to the end of the snout than to the root of the caudal. Olive-coloured 

 above, with indistinct darker spots. 



Himalayas ; Tibet. 



a. Three inches long. Darche (Lahol, Himalaya). From the Col- 

 lection of Messrs. von Schlagintweit. 



30. AULOPYGE. 

 Aulopyge, Heckel, in Rusgegger''s Reisen, i. p. 1021, 



Body naked ; lateral line miming along the middle of the tail. 

 Dorsal fin short, with a serrated spine opposite the ventral fins ; 

 anal fin very short ; caudal forked. Mouth inferior, crescent-shaped, 

 the lower jaw with a continuous lip. Barbels foiir. Pharyngoal 

 teeth compressed, 4-4. Intestinal tract with only a few convolu- 

 tions. Female with the urogenital tube and vent attached to the 

 anal fin. 



Dahuatia. 



