PISCES. 87 



Sp. Bagrus Bajad VALENC., Silurus Bajad FOBSK. and GMEL., Description 

 de I'Egypte, Poiss. PL 15, fig. i, GUERIN Iconogr., Poiss. PI. 52, 53, fig. i. 

 Bagrus Schilbeides VALENC., Hypopthalmus niloticus RUEPPELL, Beschr. u. 

 Abb. neuer Fische im Nil, Tab. I. fig. i, &c. See section of the skull in 

 OWEN Homologies, &c. PL i. fig. 3. 



The species of the sub-genus Bagrus are chiefly from the eastern hemi- 

 sphere, and are particularly numerous in Asia ; also those of the subdivisions 

 Silundra and Pangasius, are from the E. Indies. On the other hand, the 

 species of Galeichthys, Platystoma, and Phractocephaliis are from the western 

 hemisphere, principally from Brazil 1 . 



Silurus CUT. Body naked. Teeth crowded, setaceous in max- 

 illse; a row of teeth in palate, parallel to the maxillary teeth. 

 Dorsal fin single, short, rather near the head. Anal fin long. Cirri 

 six or four. Branchiostegous membrane with 10 19 rays. 



Sckilbe Cuv., VAL. First ray of dorsal fin spinose, thick, dentate. 

 Sp. Silurus mystus L., Descr. de VEgypte, Poiss. PL n, fig. 3, GUERIN Icon., 

 Poiss. PL 51, fig. 2, &c. 



Silurus Cuv., VAL. Dorsal fin unarmed. 



Sp. Silurus glanis L., BLOCK Ichth., Tab. 34, Cuv. R. Ani., ed. til., Poiss. 

 PL 96, fig. r, BRANDT u. RATZEBURG, Mediz. Zool. n. Tab. v. fig. 2, the 

 sheat-fish ; six cirri, two on the upper jaw, very long, four below the under- 

 jaw ; anal fin long and coalescing behind with the caudal fin ; is often more 

 than four feet long, and after the sturgeon is the largest fresh-water fish of 

 Europe, where it occurs especially in the eastern parts, as also in some regions 

 of Asia. In Holland the fish is found only in the Haarlem meer, with the 

 draining of which it will disappear from the catalogue of our native fishes. 

 A figure of the skeleton is found in ROSENTHAL Ichth. Tafeln, ix. figs, i 7, 

 and in BRANDT u. RATZEBURG 1. 1. Tab. vi. 



Cetopsis AGASS. Dorsal and pectoral fins unarmed. Eyes veiy 

 small, covered by skin. Branchiostegous membrane with nine rays. 

 Sp. Cetopsis coscutiens AGASS. ; Cet. Candira AGASS. Brazil. 



Saccobranchus VALENC., Heteropneustes MUELL. Body naked. 

 Teeth crowded, setaceous in maxillae and in vomer. Dorsal fin 

 single, small, unarmed, situated above the pectorals. First ray of 

 pectoral fins osseous, denticulate. Anal fin long, extending almost 

 as far as caudal. Rays of branchiostegous membrane seven. Cirri 

 eight. Two lateral sacs at the back below the muscles, resting on 

 the vertebras, connected with the branchial cavity. 



1 Compare MUELLER and TROSCHEL, Hor. Ichth. pp. 6 n, where also some other 

 sub-genera are announced. 



