OSTEOGLOSSID^. 653 



long. The colonists in New Zealand name it " Sand-eel," as it 

 frequents bays with sandy bottom. It is eaten. 



Nineteenth Family — HYODONTiDiE. 



Body covered with cycloid scales ; head naked ; harhels none. 

 Margin of the upper jaw formed hy the intermaxillaries mesially, 

 and by the maxillaries laterally, the latter leing artieidated to 

 the end of the former. Opercular apparatus complete. Adipose 

 fin none ; the dorsal fm belongs to the caudal portion of the 

 vertebral column. Stomach horseshoe-shaped, without Hind 

 sac ; intestine short ; one pyloric appendage. Pseuddbranchice 

 none ; air-bladder simple. Gill- openings wide. The ova fall 

 into the abdominal cavity before exclusion. 



One genus and species only {Hyodon tergisus) is known, 

 generally called " Moon-eye." It is abundant in the western 

 streams and great lakes of North America. From 12 to 18 

 inches long. 



-■&• 



Twentieth Family — PANTODONTiDiE. 



Body covered with large cycloid scales ; sides of the head 

 osseous. Margin of the upper jaw formed by the single inter- 

 maxillary mesially, and by the maxillaries laterally. The 

 dorsal fin belongs to the caudal portion of the vertebral column, 

 is short, opposite and similar to the anal. Gill-openings wide; 

 gill-covers consisting of a prceoperculum and operculum only. 

 Branchiostegals numerous. Pseudobranchice none ; air-bladder 

 simple. Stomach without coecal sac; one pyloric appendage. 

 Sexual organs with a du^t. 



A small freshwater -fish (Pantodon buchholzi), singularly 

 alike to a Cyprinodont, from the west coast of Africa. 



Twenty-First Family — OsTEOGLOssiDiE. 

 Body covered with large hard scales, composed of pieces like 



