GIO FISHES. 



This order consists of the following genera, namely, 1. Aeipenser. 2. Spa- 

 tularia : of which we have figured the following species. 



Aeipenser sturio.—1\w Sturgeon. Plate liv. fig. 7. Described, vol. iii. 

 p. 513. 



Spatularia reticulata. — The Reticulated Spatularia. Plate liv. fig. 8. 

 Head and snout nearly as long as the body and tail, and covered with reti- 

 culated striae ; body sub-cylindrical, tapering to the tail ; lateral lines con- 

 spicuous ; dorsal fin near the tail, which is luniform. 



SUB-CLASS II.— OSSEOUS FISHES. 



ORDER IV.— PLECTOGNATHI. 



Bones fibrous ; upper jaw formed by the intermaxillary bone, which ia 

 immoveably attached upon the side of the maxillary bone ; palatine arch ad. 

 hering to the cranium ; branchial cleft simple. 



This order consists of eight genera. 



TRIBE I.— GYMNODONTES. 



1. Diadon-, 2. Tetraodon ; 3. Cephalus. 



TRIBE II.— SCLERODERMI,— Cwwier. 



4. Balistres; 5. Monocanthus ; 6. Al uteres ; 7. Triacanthus; 8. Ostra- 

 cion ; of which we have figured the following species. 



Diadon orbicularis. — The Orbicular Diadon. Plate Iv. fig. 1. Do- 

 scribed, vol. iii. p. 523. 



Tetraodon lineatus. — The Lineated Tetraodon. Plate Iv. fig. 2. De- 

 scribed, vol. iii. p. 523. 



Cephalus brevis. — The Short Sun-Fish. Plate Iv. fig. 3. Described, 

 vol. iii. p. 519. 



Balistris vetula.— The Old Wife File.Fish. Plate Iv. fig. 4. Describ 

 cd, vol. iii. p. 522. 



Aluteres monoceros. — The One-Horned Aluteres. Plate Iv. fig. 5. 

 Ash-coloured, with irregular brown undulated patches. Onefootlong. In- 

 habits the Eastern and American seas. 



Ostracion comutus. — The Horned Trunk-Fish. Plate Iv. fig. 6. Quad- 

 rangular ; yellow-fawn colour; deeper on the abdomen; head with 

 two horizontal horns ; and two curved round horns pointing backward, 

 placed on each side of the anal fin. Ten inches long. Inhabits the Indian 

 seas. 



ORDER v.— LOPHOBRANCHII. 



Jaws entire ; branchiae in the form of small round tufts, disposed in pairs 

 along the branchial arches. 



Tliis order consists of four genera, as follow. 1. Syngnathus ; 2. Hippo- 

 campus ; 3. Solenostomns ; 4. Pegasus ; of which «e have figured the foU 

 lowing species. 



