SYNOPSIS OF THE ARRANGEMENT OF FISHES. 197 



Petromtzon. Body cylindrical ; spiracles seven on each side. 



Petromyxon. Teeth in several rows. 



Heptatremus. Teeth in two rows. 



Ammocoetes. Lower lip straight, and transverse ; teeth none. 



MrxiNE. Eyes none ; lips surrounded with cirri. 



Familt 5. CYCLOPTERID^. 

 Body ovate ; no scales ; adhesive disks on the belly. 



Lepadogaster. Disks two ; caudal fin distinct. 



Piecephalus. Disks two, with cup-shaped suckers. 



Rupisuga. Disks two ; caudal united with the dorsal and anal. 



GoBiEsox. Disk single ; caudal fin distinct. 



Ctclopterus. Body short, thick ; dorsal fin short. 



LiPARis. Body sub-anguiUiform ; dorsal fin long. 



CHAP. II. 



A GENERAL ARRANGEMENT OF FISHES ACCORDING TO THEIR 

 SUPPOSED NATURAL AFFINITIES AND RELATIONS.* 



Order I. ACANTHOPTERYGES. 

 Tribe I. MACROLEPTES. 



Family 1. PERCID^. Perches. 



Fins without scales ; body oblong ; scales distinct ; 

 mouth large ; teeth in the jaws_, vomer, and palate ; 

 operculum spined ; preoperculum serrated ; ventral fins 

 placed beneath_, or slightly before, the pectorals. 



* During the slow progress of this chapter through the press, several ad- 

 ditions and improvements have been made, and sub-genera added or charac- 

 terised, not to be found in the synopsis. 



3 



