1887] i ~ Geology and Paleontology. 10Ig | 
ous genera, referred by Zittel to the families Stylodontide, Sphær- 
v de, and Saurodontide. Genera with annular intercentra, 
8 Aspidorhynchidee (Rhynchodontide, Zitt.), should be referred 
‘oth sospondyli. Until the vertebral columns of the genera are 
‘etter known, it will be difficult to decide which belong to the 
erospondyli and which to the Isospondyli. 
~The P lacodermi, after the exclusion of the Pteraspidida, Ce- 
thalaspididze, Pterichthyidz, and Bothriolepidide, form’a homo- 
neous order. So far as the structure of the fins is known, it ap- 
_ Pas to belong to the superorder of the Actinopterygia,* but this 
Snot fully established. If so, it appears to have the dorsal and 
Banca) n-rays equal in number with the baseosts, and these to be 
a ain number and continuous with the axonosts (according to 
o Soenen, in Coccosteus inflatus), characters not known in any 
the Seed of Actinopterygia. But one family is certainly known, 
thv; osteidæ, which has a hinge-like articulation of the epi- 
Vicula k 
a descriptions and figures of Professor Zittel render it per- 
“tty clear that the fishes rarely develop complete nia 
ed K 
-Origi : 
: at wi the rhachitomous vertebra in the fishes is the same as 
i ich I have pointed out in the Batrachia, viz., as the effect 
Vii aeer-tooth Tiger from the Loup Fork Beds.—The 
Hare 'ver‘and John Day Miocene formations in North Amer- 
fimi well known to contain remains of saber-tooth cats of the 
; 
: 
w . ) : 
E ° Species of saber-tooths of the family Felidæ. i Hithe 
Under the circumstances it was to 
ts under the name o grodus catocopis. — 
the name of Macherod: ie se bed he 
. 
d with the 1 
ist, 1886, p, 1031, where it is provisionally 
Intercentrum of the Terrestrial Vertebrata,” 
p 243, by ED Cope. 
XXL—No, 11, 
