CATALOGUE 



FISHES. 



Subclass I. TELEOSTEI. 



{CONTINUED.) 



Order IV. PHYSOSTOMI. 



All the fin-rays are articulated ; only the first of the 

 dorsal and pectoral fins is sometimes more or less 

 ossified. The ventral fins, if present, are abdominal, 

 without spine. Air-bladder, if present, ^vith a pneu- 

 matic duct. 



Cfr. Miiller, in Abhanrll. Eerl. Acad. 1844. p. 174. 



Fam. 1. SILURID.E. 



Siluroidei, Cur. Rbgiie Anim. 



Skin naked or with osseous scutes, but without 

 scales. Barbels always present ; maxillary bone rudi- 

 mentary, almost always forming the base of a maxil- 

 lary barbel. Margin of the upper jaw formed by the 

 intermaxillaries only. Suboperculum absent. Air- 



