STEWART: ICHTHYIC FAUNA OF THE KANSAS CRETACEOUS. 23 
Further in his modified description of A. /eweszensis Agass., Mr. 
Newton says*: 
‘‘T am far from being convinced of the propriety of placing it 
(A. lewestensis) in the group of the Sauwrodontide.” 
From the above it would seem that there is some doubt as to the 
exact systematic position of //yfsodon, but until more complete 
specimens are found, showing the other cranial characters not 
known at present, it will have to remain in the Saurodontide. 
After having made a careful study of the Saurodont material in 
the Kansas University Museum, and in view of some new charac- 
ters which have been brought to light since Prof. Cope made his 
synopsis, I deem it advisable to divide this family into two groups 
which I will characterize as follows: 
GROUP I. 
Carnivorous fishes, many of large size. Jaws without foramina 
below the alveolar border internally. Teeth cylindric, no preden- 
tary. Supra-occipital produced upward into a crest. New crown 
rises within the pulp cavity of the functional tooth in the suc- 
cession of the teeth. Embracing the genera, Portheus, Ichthy- 
odectes and Hypsodon, of which Portheus should be the type. 
GROUP II. 
Carnivorous fishes not attaining as large a size as in the first 
group. Jaws with foramina or deep notches below the alveolar 
border internally. Teeth compressed, knife-like, or sub-cylindric. 
Predentary present. Supra-occipital not raised into a crest. 
Succeeding crown developed outside of the functional tooth as in 
many Lacertilia including the Mosasaurs. In this Group are 
Daptinus, Saurodon, and Saurocephalus of which Daptinus should 
be the type. 
Below we give a revised synopsis of the family: 
1. Predentary not present, no foramina below the alveolar border 
internally; teeth cylindric. 
Teeth of unequal length, some of them are greatly 
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I]. Predentary present. 
a. Foramina occurring below the alevolar border 
internally. 
Teeth with short, compressed crowns...... Saurocephalus. 
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aa. Deep notches occurring below the alveolar bor- 
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