22 KANSAS UNIVERSITY QUARTERLY. 
I. Jaws without foramina on the inner face below the alveolar 
margin: 
a. Teeth cylindric: 
Teeth of unequal lengths; some of them greatly 
developed...c2) somo tue cere ack ho ek eric em area Gee 
‘Teeth «of ,equal lengthy .y- Sr: ye eels a Ca aera 
aa. Teeth compressed, knife like: 
Teeth of unequal length; some of the anterior 
ereatly developed.\aa.a5 .7ie-eu vs atise epic ol eeeoneeae 
Meeth equal 2. 3.5274. e eee eae cis ete ry re ma ears 
¥ : . 
II. Dentary bones pierced by foramina below the alveolar border: 
Teeth with sub-cylindric crowns................Saurodon. 
Teeth with short, compressed crowns......Saurocephalus. 
Prof. Cope also says}: ‘‘There are some other forms to be 
referred to this family, whose characters are not yet fully deter- 
mined. Thus Ayfsodon Agass., from the European Chalk, is 
related to the two genera first above named, but, as left by its 
author in the ‘ Poissons Fossiles,’ includes apparently two generic 
forms. The first hgured and described has the mandibular teeth 
of equal length. In the second, they are unequal, as in Portheus, 
to which genus this specimen ought, perhaps, to be referred. 
Retaining the name //yfsodon for the genus with equal mandibular 
teeth, its relations to /chthyodectes remain to be determined by 
further study of /7. /eweszensis. The view of the superior walls of 
the cranium given by Professor Agassiz presents characters quite 
distinct from what I have observed in Portheus.” 
In the hight of the above and having compared Agassiz’s type 
specimens with remains of Portheus and Jchthyodectes, Mr. E. T. 
Newton says{: ‘‘I am convinced of the necessity of dividing 
Hypsodon lewesiensis as suggested by Prof. Cope; and it is proposed 
to retain this name for the specimen first described by Agassiz, 
and upon which the species and genus are really founded (Poiss. 
Foss., Vol. V, pl 25a, figs, 1, 2, and 4), and to remove Dr. Man- 
tell’s specimens and certain others (Poiss. Foss., pl. 25a, fig. 3, 
and 25b, figs. 1a, 1b, 2, and 3), to the genus Portheus of Cope.” 
*The name Hrisicthe Cope. 1872, has been shown to be a synonym of Protosphyrcna 
Leidy. 1856. Newton, Q. J. G.3S., 1878, p. 787, and has been placed in a new family, 
Protosphyreenidae Woodward. Cope’s objection to Protosphyrena was that Dr. Leiay 
did not sufficiently characterize his genus, and for this reason it should he ignored 
If such objections are deemed valid by naturalists, very many of the genera and 
species of early paleontologist would cease to be recognized, not only among the 
fee but in every other class of the animal kingdom. 
. , 189. 
EQ Gs) Vil, New LU, pe OT 
