Surmullets, Croakers, etc. 573 
The Jawfishes: Opisthognathide, etc.—The Pseudochromi- 
pide are marine-fishes of the tropics with the lateral line inter- 
rupted, and with a single dorsal. They bear some resemblance 
to Plestops and other aberrant Serranide. 
Fic. 466.—Gnathypops evermanni Jordan & Snyder. Misaki, Japan. 
Very close to these are the Optstognathide or jawfishes with 
a single lateral line and the mouth very large. In certain 
species of Opisthognathus, the maxillary, long and curved, extends 
far behind the head. The few species are found in warm 
Fic. 467.—Jawfish, Opisthognathus macrognathus Poey. Tortugas, Fla. 
seas, but always very sparingly. Some of them are handsomely 
colored. 
The Stone-wall Perch: Oplegnathide.—A singular group evi- 
dently allied to the Hemulide is the family of Oplegnathide. 
In these fishes the teeth are grown together to form a bony beak 
like the jaw of a turtle. Except for this character, the species 
are very similar to ordinary grunts. While the mouth resembles 
