4 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



ee. Premaxillary atrophied or lost; maxillaries PAGE 



lateral, more or less confluent with the 



palatines Apodes 90 



dd.Body not truly eel-shaped; vertebrae in 

 moderate number (14 to 100); ventral fins 

 usually present; gill openings not restricted, 

 f . Ventral fins, if present, abdominal; fins with- 

 out spines. 



g. Body stout, not covered with bony plates; 

 gills laminated; ventral fins present, ab- 

 dominal, without spines, 

 h. Mesocoracoid well developed ; pectoral fins 



inserted low Isospondyli 9 2 



, hh. Mesocoracoid always wanting; head scaly ; 



dorsal and anal fins without spines, 

 i. Lateral line none, or imperfectly devel- 

 oped ; air bladder with a persistent duct ; 



lower pharyngeals separate .Haplomi 98 



ii. Lateral line developed, concurrent with 



the belly ; air bladder without duct in the 



adult; lower pharyngeals fully united . . Syncntognathi 160 



gg. Body elongate, covered with bony plates 



which are firmly connected, forming a 



carapace; gills tufted; no ventral fins; 



gill openings small Lophobranchia 162 



ff . Ventral fins usually anterior in position ; 



spines usually present in the fins Acaiithopttri 164 



Order II. Rhomboganoidea, 



THE GARPIKES. 



This order comprises one family of living fishes. Tail hetero- 

 cercal; vertebrae connected by ball and socket joints, the concavity 

 of each vertebra being posterior; air bladder lung-like, but connecting 

 with the dorsal side of the oesophagus. 



Family II. Lepidosteidre. 



THE GARPIKES. 



Body elongate, subcylindrical, covered with hard rhombic ganoid 

 scales or plates which are imbricated in oblique series running down- 

 ward and backward; premaxillary forming most of the upper jaw; 

 jaws long, spatulate or beak-like; teeth on jaws, vomer, and palatines; 



