lOI 



GANOIDE 1. 

 C YCLOGANOIDEL 



A MI ID ^E. 



" Scales cycloid ; a long, soft dorsal fin. Abdominal and 

 caudal parts of the vertebral column subequal in extent." 

 (Giinther.) 



AM I A. 



Body elongate subcylindrical, compressed behind ; snout 

 short and rounded. Jaws with an outer series of closely-set 

 pointed teeth, and with a band of small teeth , similar teeth on 

 the vomer, palatine, and pterygoid bones. Long dorsal, short 

 anal, and rounded nonfurcate caudal fin. Ventrals well de- 

 veloped. A single large gular plate ; branchiostegal rays ten 

 to twelve. 



Amia (Protamia) uintaensis, Leidy. 



Cont. to Ext. Vert. Fauna, p 1S5. 



A species of large mud-fishes related to the modern Amia 

 calva. The vertebrae are all much wider than they are high. 

 The articular cones have their bottoms considerably above 

 the centre, and are minutely perforate for the notochord. The 

 centrum is transversely curved from side to side, and has the 

 convexity directed forwards ; it is truncate below, making the 

 infero-lateral angles quite prominent in the anterior dorsal 

 region ; in the posterior there are two fossae. The diapophy- 

 ses are large, but almost sessile, and take their origin above 

 the centre, on the same line as the bottom of the articular 

 cone. The facets for the neurapophyses are in the form of 

 the figure 8 ; their internal borders are prominent. The atlas 

 has a broad oval centrum, which is not truncate below, and 

 has no markings of any kind on the under surface. The 

 articular faces for the neurapophyses are prominent, and 

 approach near together. The depression for the occipital 

 condyle is small, circular, and situated above the centre. 



From Henry's Fork. 



Amia depressa (?), Marsh. 



Pr. Ac. Nat. Sc. 1871, p. 103 



In this species the dorsal centra are wide, low, and short, 



