562 Mr. C. T. Regan on the 



B, Parapopliysis of fourth vertebra a horizontal lamina, sharply bent 

 downward in front to form a thick vertical plate attached to the 

 stem and lower limb of supra-cleithrum ; a nasal barbel. 



Clarotes, Chrysichthys*. 



II. Pterygoid and mesopterygoid united by suture or ankylosis to 

 form a transverse crescent ; parapophysis of fourth vertebra a 

 transverse lamina with a decurved anterior process attached to 

 the inner edge of a vertical laminar expansion of the stem and 

 lower limb of the supra-cleithrum, which supports the anterior 

 wall of the air-bladder ; a nasal barbel. (Bagrina;.) 



Bagrus, Macrones, Liocassis, Bayroides, Olyra. 



^/ 

 Family 7. AmiuridsB. 



Closely related to the Bagridse, but without a pterygoid 

 and with the pelvic fins 8- or 9-rayed ; palate toothless. The 

 vertebrae number 44 to 50 (16-19 + 28-31), the anterior 

 vertebrae formed as in Auchenoglanis or Rita; in Amiurus 

 the pectoral arch is as in the Bagridse, but in Noturus the 

 post-temporal is absent and the lower limb of the supra- 

 cleithrum is short, only connected with the basioccipital by 

 a ligament. 



Fresh- water fishes of North America, with a species of 

 Amiurus in China. 



In some species of Amiurus the anal fin is quite long, as 

 in the Schilbeidse, but the skull is typically Bagrid, differing 

 from that of the Schilbeidse in the projecting lateral ethmoids 

 and pterotics. 



Family 8. Amblycepidae. 



External characters of the Bagridse, to which they bear a 

 general resemblance in their osteology, diff'ering in certain 

 features of specialization. The pterygoid is absent, the 

 metapterygoid is reduced, and the elongate mesopterygoid 

 extends from the palatine to the hyomandibular (tig. 1, C) . 

 There is no post-temporal and the proximal end of the upper 

 limb of the supra-cleithrum is wedged in between pterotic 

 and epiotic. The parapophyses of the fourth vertebra form 

 on each side a semicylinder incomplete below, or an inverted 

 cup, partly enclosing the reduced air-bladder, which is divided 

 into two lateral sacs. Vertebrae 36 to 45 (15-16 + 21-29). 



Asiatic fresh-water fishes of small size, belonging to four 

 genera : Amblyceps, Liobagrus, Akysis (Sosia) . ^d Acro- 

 chordonicht/iys. 



I have examined skeletons of Amblyceps and Liobagrus. JC 



* Phyllonemus, without nasal barbel, may be related to Chrysichthys. 



