78 TJie American Geologist. August, i89<> 
LEPTICHTHYS, A NEW GENUS OF FISHES FROM 
THE CRETACEOUS OF KANSAS. 
By Alban Stewart. 
Family HALECID/E. 
LEPTICHTHYS gon. nov. 
There are several specimens in our collection that evi- 
dently belong to this family, which seem to differ from any 
of the other genera referred to it for which I will venture to 
propose the generic name of Leptichthys. This genus seems 
to be closel)' related to Osmeroides, Agassiz, from the Chalk 
of Syria and England, but differs from it in the presence of 
a short dorsal fin and nonstriated scales- It also differs 
from Apsopelix, Cope, in the anterior position of the dorsal fin. 
The body is ellipsiform and covered with large and thin 
C3xloid scales, which are concentrically striated ventrally 
but seem to lose this character to some extent in the dor- 
sal region where they are somewhat rugosely marked. The 
pelvic bones seem to be formed of heavy transverse bars of 
bone which are thickened externally for the attachment of 
the pelvic fin. These bones probably have some anterior 
extension, but how much cannot be ascertained from our 
specimens. The dorsal fin is short and composed of nume- 
rous rays which are situated in front of the middle portion 
of the bod}'. The pectorals are broad and rather elongated. 
The pelvic fin is broad, short, and is composed of a less 
number of rays than the pectoral. There are no remains of 
anal fins in an}' of our specimens, but they will doubtless 
be found in more completely preserved individuals. The 
caudal fin is deepl}' cleft. The skull seems to be rather 
bluntl}' pointed in front. The dentaries are short with acute- 
ly pointed teeth, and the lower borders of the bone are di- 
rected upward in front giving the chin a somewhat rounded 
appearance. The vertebree are two-grooved and longer 
than deep. 
LEPTICHTHYS AGILIS, sp. nov. 
Scales large, about ten or twelve series to be seen across 
the body. Pectoral fins composed of at least fourteen rays, 
the first two or three of which are cross-segmented while 
the remainder are longitudinalh' split. The pelvic fins are 
situated posteriori}- and the cross-segmentation is absent 
